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Versions: 01 02 03 04 05 06 07 08 rfc2669                               
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                Cable Device Management Information Base
                  for MCNS compliant Cable Modems and
                    Cable Modem Termination Systems
                draft-ietf-ipcdn-cable-device-mib-04.txt

                      Fri May 22 17:39:15 PDT 1998


                         Guenter Roeck (editor)
                             cisco Systems
                            groeck@cisco.com





Status of this Memo

This document is an Internet-Draft.  Internet-Drafts are working
documents of the Internet Engineering Task Force (IETF), its Areas, and
its Working Groups.  Note that other groups may also distribute working
documents as Internet-Drafts.

Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
time.  It is inappropriate to use Internet-Drafts as reference material
or to cite them other than as a "work in progress".

To view the entire list of current Internet-Drafts, please check
the "1id-abstracts.txt" listing contained in the Internet-Drafts
Shadow Directories on ftp.is.co.za (Africa), ftp.nordu.net
(Northern Europe), ftp.nis.garr.it (Southern Europe), munnari.oz.au
(Pacific Rim), ftp.ietf.org (US East Coast), or ftp.isi.edu
(US West Coast).

Abstract

This memo defines an experimental portion of the Management Information
Base (MIB) for use with network management protocols in the Internet
community.  In particular, it defines a basic set of managed objects for
SNMP-based management of MCNS compliant Cable Modems and Cable Modem
Termination Systems.

This memo specifies a MIB module in a manner that is compliant to the
SNMPv2 SMI.  The set of objects is consistent with the SNMP framework
and existing SNMP standards.

This memo does not specify a standard for the Internet community.

This memo is a product of the IPCDN working group within the Internet
Engineering Task Force.  Comments are solicited and should be addressed
to the working group's mailing list at ipcdn@terayon.com and/or the
author.


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Table of Contents


1 The SNMPv2 Network Management Framework .........................    3
2 Object Definitions ..............................................    3
3 Overview ........................................................    4
3.1 Structure of the MIB ..........................................    4
3.2 Management requirements .......................................    4
3.2.1 Handling of Software upgrades ...............................    4
3.2.2 Events and Traps ............................................    5
3.2.3 Trap Throttling .............................................    6
3.2.3.1 Trap rate throttling ......................................    6
3.2.3.2 Limiting the trap rate ....................................    6
3.3 Protocol Filters ..............................................    6
4 Definitions .....................................................    7
5 Acknowledgments .................................................   31
6 References ......................................................   31
7 Security Considerations .........................................   31
8 Author's Address ................................................   32


































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1.  The SNMPv2 Network Management Framework

The SNMPv2 Network Management Framework presently consists of three
major components.  They are:

o    the SMI, described in RFC 1902 [1] - the mechanisms used for
     describing and naming objects for the purpose of management.

o    the MIB-II, STD 17, RFC 1213 [2] - the core set of managed objects
     for the Internet suite of protocols.

o    the protocol, RFC 1157 [3] and/or RFC 1905 [4], - the protocol for
     accessing managed objects.

The Framework permits new objects to be defined for the purpose of
experimentation and evaluation.


2.  Object Definitions

Managed objects are accessed via a virtual information store, termed the
Management Information Base or MIB.  Objects in the MIB are defined
using the subset of Abstract Syntax Notation One (ASN.1) defined in the
SMI.  In particular, each object type is named by an OBJECT IDENTIFIER,
an administratively assigned name.  The object type together with an
object instance serves to uniquely identify a specific instantiation of
the object.  For human convenience, we often use a textual string,
termed the descriptor, to refer to the object type.

























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3.  Overview

This MIB provides a set of objects required for the management of MCNS
compliant Cable Modems (CM) and Cable Modem Termination Systems (CMTS).
The specification is derived from the MCNS Radio Frequency Interface
specification [6].


3.1.  Structure of the MIB

This MIB is structured in six groups:

o    The docsDevBase group extends the MIB-II 'system' group with
     objects needed for cable device system management.

o    The docsDevNmAccessGroup provides a minimum level of SNMP access
     security (see Section 3 of [8]).

o    The docsDevSoftware group provides information for network-
     downloadable software upgrades.

o    The docsDevServer group provides information about the progress of
     the interaction with various provisioning servers.

o    The docsDevEvent group provides control and logging for event
     reporting

o    The docsDevFilter group configures filters at link layer and IP
     layer for bridged data traffic.


3.2.  Management requirements

3.2.1.  Handling of Software upgrades

The Cable Modem software upgrade process is documented in [6].  From a
network management station, the operator:

o    sets docsDevSwServer to the address of the TFTP server for software
     upgrades

o    sets docsDevSwFilename to the file pathname of the software upgrade
     image

o    sets docsDevSwAdminStatus to upgrade-from-mgt

One reason for the SNMP-initiated upgrade is to allow loading of a
temporary software image (e.g., special diagnostic software) that
differs from the software normally used on that device without changing
the provisioning database.



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Note that software upgrades should not be accepted blindly by the cable
device. The cable device may refuse an upgrade if:

o    The download is incomplete.

o    The file contents are incomplete or damaged.

o    The software is not intended for that hardware device (may include
     the case of a feature set that has not been purchased for this
     device).


3.2.2.  Events and Traps

This MIB provides control facilities for reporting events through
syslog, traps, and nonvolatile logging.  If events are reported through
traps, the specified conventions must be followed.  Other means of event
reporting are outside the scope of this document.

The definition and coding of events is vendor-specific.  In deference to
the network operator who must troubleshoot multi-vendor networks, the
circumstances and meaning of each event should be reported as human-
readable text.  Vendors SHOULD provide time-of-day clocks in CMs to
provide useful timestamping of events.

For each vendor-specific event that is reportable via TRAP, the vendor
must create an enterprise-specific trap definition.  Trap definitions
MUST include the event reason encoded as DisplayString and should be
defined as:

trapName NOTIFICATION-TYPE
        OBJECTS {
            ifIndex,
            eventReason,
            other useful objects
        }
        STATUS      current
        DESCRIPTION
            "trap description"
        ::= Object Id

Note that ifIndex is only included if the event or trap is interface
related.

The last digit of the trap OID for enterprise-specific traps must match
docsDevEvId.  For SNMPv1-capable Network Management systems, this is
necessary to correlate the event type to the trap type.  Many Network
Management systems are only capable of trap filtering on an enterprise
and single-last-digit basis.




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3.2.3.  Trap Throttling

The CM and CMTS MUST provide support for trap message throttling as
described below.  The network operator can employ message rate
throttling or trap limiting by manipulating the appropriate MIB
variables.


3.2.3.1.  Trap rate throttling

Network operators may employ either of two rate control methods.  In the
first method, the device ceases to send traps when the rate exceeds the
specified maximum message rate.  It resumes sending traps only if
reactivated by a network management station request.

In the second method, the device resumes sending traps when the rate
falls below the specified maximum message rate.

The network operator configures the specified maximum message rate by
setting the measurement interval (in seconds), and the maximum number of
traps to be transmitted within the measurement interval.  The operator
can query the operational throttling state (to determine whether traps
are enabled or blocked by throttling) of the device, as well as query
and set the administrative throttling state (to manage the rate control
method) of the device.


3.2.3.2.  Limiting the trap rate

Network operators may wish to limit the number of traps sent by a device
over a specified time period.  The device ceases to send traps when the
number of traps exceeds the specified threshold.  It resumes sending
traps only when the measurement interval has passed.

The network operator defines the maximum number of traps he is willing
to handle and sets the measurement interval to a large number (in
hundredths of a second).  For this case, the administrative throttling
state is set to stop at threshold which is the maximum number of traps.

See "Techniques for Managing Asynchronously Generated Alerts" [7] for
further information.


3.3.  Protocol Filters

The Cable Device MIB provides objects for both LLC and IP protocol
filters.  The LLC protocol filter entries can be used to limit CM
forwarding to a restricted set of network-layer protocols (such as IP,
IPX, NetBIOS, and Appletalk).  The IP protocol filter entries can be
used to restrict upstream or downstream traffic based on source and
destination IP addresses, transport-layer protocols (such as TCP, UDP,
and ICMP), and source and destination TCP/UDP port numbers.


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4.  Definitions


DOCS-CABLE-DEVICE-MIB DEFINITIONS ::= BEGIN

IMPORTS
        MODULE-IDENTITY,
        OBJECT-TYPE,
        BITS,
        IpAddress,
        Unsigned32,
        Integer32,
        Counter32,
        experimental
                FROM SNMPv2-SMI
        DisplayString,
        RowStatus,
        DateAndTime,
        TruthValue,
        TEXTUAL-CONVENTION
                FROM SNMPv2-TC
        OBJECT-GROUP,
        MODULE-COMPLIANCE
                FROM SNMPv2-CONF;
--      InterfaceIndexOrZero
--              FROM IF-MIB;

docsDev MODULE-IDENTITY
        LAST-UPDATED    "9805221716Z" -- May 22, 1998
        ORGANIZATION    "IETF IPCDN Working Group"
        CONTACT-INFO
            "        Guenter Roeck
             Postal: cisco Systems
                     170 West Tasman Drive
                     San Jose, CA 95134
                     U.S.A.
             Phone:  +1 408 527 3143
             E-mail: groeck@cisco.com"
        DESCRIPTION
            "This is the MIB Module for MCNS-compliant cable modems and
             cable-modem termination systems."
        ::= { experimental 83 }

-- The following textual convention is from the
-- Interfaces MIB draft. It should go away once this
-- draft has been published as RFC.

InterfaceIndexOrZero ::= TEXTUAL-CONVENTION
    DISPLAY-HINT "d"
    STATUS       current
    DESCRIPTION
            "This textual convention is an extension of the


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            InterfaceIndex convention.  The latter defines a
            greater than zero value used to identify an interface
            or interface sub-layer in the managed system.  This
            extension permits the additional value of zero.  the
            value zero is object-specific and must therefore be
            defined as part of the description of any object which
            uses this syntax.  Examples of the usage of zero might
            include situations where interface was unknown, or
            when none or all interfaces need to be referenced."
    SYNTAX       Integer32 (0..2147483647)

docsDevMIBObjects  OBJECT IDENTIFIER ::= { docsDev 1 }
docsDevBase OBJECT IDENTIFIER ::= { docsDevMIBObjects 1 }

--
-- For the following object, there is no concept in the
-- RFI specification corresponding to a backup CMTS. The
-- enumeration is provided here in case someone is able
-- to define such a role or device.
--

docsDevRole OBJECT-TYPE
        SYNTAX INTEGER {
            cm(1),
            cmtsActive(2),
            cmtsBackup(3)
        }
        MAX-ACCESS  read-only
        STATUS      current
        DESCRIPTION
            "Defines the current role of this device."
        ::= { docsDevBase 1 }

docsDevDateTime OBJECT-TYPE
        SYNTAX      DateAndTime
        MAX-ACCESS  read-write
        STATUS      current
        DESCRIPTION
            "The date and time, with optional timezone information."
        ::= { docsDevBase 2 }

docsDevResetNow OBJECT-TYPE
        SYNTAX      TruthValue
        MAX-ACCESS  read-write
        STATUS      current
        DESCRIPTION
            "Setting this object to true(1) causes the device to reset.
             Reading this object always returns false(2)."
        ::= { docsDevBase 3 }

docsDevSerialNumber OBJECT-TYPE
        SYNTAX      DisplayString


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        MAX-ACCESS  read-only
        STATUS      current
        DESCRIPTION
            "The manufacturer's serial number for this device."
        ::= { docsDevBase 4 }

docsDevSTPControl OBJECT-TYPE
        SYNTAX INTEGER {
            stEnabled(1),
            noStFilterBpdu(2),
            noStPassBpdu(3)
        }
        MAX-ACCESS  read-write
        STATUS      current
        DESCRIPTION
            "This object controls operation of the spanning tree
             protocol (as distinguished from transparent bridging).
             If set to stEnabled(1) then the spanning tree protocol
             is enabled, subject to bridging constraints. If
             noStFilterBpdu(2), then spanning tree is not active,
             and Bridge PDUs received are discarded.
             If noStPassBpdu(3) then spanning tree is not active
             and Bridge PDUs are transparently forwarded. Note that
             a device need not implement all of these options,
             but that noStFilterBpdu(2) is required."
        ::= { docsDevBase 5 }

--
-- The following table provides one level of security for access
-- to the device by network management stations.
-- Note that access is also constrained by the
-- community strings and any vendor-specific security.
--

docsDevNmAccessTable OBJECT-TYPE
        SYNTAX      SEQUENCE OF DocsDevNmAccessEntry
        MAX-ACCESS  not-accessible
        STATUS      current
        DESCRIPTION
            "This table controls access to SNMP objects by network
             management stations. If the table is empty, access
             to SNMP objects is unrestricted."
        ::= { docsDevMIBObjects 2 }

docsDevNmAccessEntry OBJECT-TYPE
        SYNTAX      DocsDevNmAccessEntry
        MAX-ACCESS  not-accessible
        STATUS      current
        DESCRIPTION
            "Controls access to SNMP objects by a particular network
             management station. For each entry in this table, the
             contents are not readable unless the management station


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             has read-write permission."
        INDEX { docsDevNmAccessIndex  }
        ::= {  docsDevNmAccessTable 1 }

DocsDevNmAccessEntry ::= SEQUENCE {
            docsDevNmAccessIndex         INTEGER,
            docsDevNmAccessIp            IpAddress,
            docsDevNmAccessIpMask        IpAddress,
            docsDevNmAccessCommunity     DisplayString,
            docsDevNmAccessControl       INTEGER,
            docsDevNmAccessInterfaces    OCTET STRING,
            docsDevNmAccessStatus        RowStatus
        }

docsDevNmAccessIndex OBJECT-TYPE
        SYNTAX      INTEGER (1..2147483647)
        MAX-ACCESS  not-accessible
        STATUS      current
        DESCRIPTION
            "Index used to order the application of access entries."
        ::= { docsDevNmAccessEntry 1 }

docsDevNmAccessIp OBJECT-TYPE
        SYNTAX      IpAddress
        MAX-ACCESS  read-create
        STATUS      current
        DESCRIPTION
            "The IP address (or subnet) of the network management
             station. The address 255.255.255.255 is defined to mean
             any NMS. If traps are enabled for this entry, then the
             value must be the address of a specific device."
        DEFVAL { 'ffffffff'h }
        ::= { docsDevNmAccessEntry 2 }

docsDevNmAccessIpMask OBJECT-TYPE
        SYNTAX      IpAddress
        MAX-ACCESS  read-create
        STATUS      current
        DESCRIPTION
            "The IP subnet mask of the network management stations.
             If traps are enabled for this entry, then the value must
             be 255.255.255.255."
        DEFVAL { 'ffffffff'h }
        ::= { docsDevNmAccessEntry 3 }

docsDevNmAccessCommunity OBJECT-TYPE
        SYNTAX      DisplayString
        MAX-ACCESS  read-create
        STATUS      current
        DESCRIPTION
            "The community string to be matched for access by this
             entry. If set to the null string then any community string


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             will match."
        DEFVAL { "public" }
        ::= { docsDevNmAccessEntry 4 }

docsDevNmAccessControl OBJECT-TYPE
        SYNTAX         INTEGER {
            none(1),
            read(2),
            readWrite(3),
            roWithTraps(4),
            rwWithTraps(5),
            trapsOnly(6)
        }
        MAX-ACCESS  read-create
        STATUS      current
        DESCRIPTION
            "Specifies the type of access allowed to this NMS. Setting
             this object to none(1) causes the table entry to be
             destroyed. Read(2) allows access by 'get' and 'get-next'
             PDUs. ReadWrite(3) allows access by 'set' as well.
             RoWithtraps(4), rwWithTraps(5), and trapsOnly(6)
             control distribution of Trap PDUs transmitted by this
             device."
        DEFVAL { read }
        ::= { docsDevNmAccessEntry 5 }

-- The syntax of the following object was copied from RFC1493,
-- dot1dStaticAllowedToGoTo.

docsDevNmAccessInterfaces OBJECT-TYPE
        SYNTAX      OCTET STRING
        MAX-ACCESS  read-create
        STATUS      current
        DESCRIPTION
            "Specifies the set of interfaces from which requests from
             this NMS will be accepted.
             Each octet within the value of this object specifies a set
             of eight interfaces, with the first octet specifying ports
             1 through 8, the second octet specifying interfaces 9
             through 16, etc.  Within each octet, the most significant
             bit represents the lowest numbered interface, and the least
             significant bit represents the highest numbered interface.
             Thus, each interface is represented by a single bit within
             the value of this object. If that bit has a value of '1'
             then that interface is included in the set.

             Note that entries in this table apply only to link-layer
             interfaces (e.g., Ethernet and CATV MAC). Upstream and
             downstream channel interfaces must not be specified."
--         DEFVAL is the bitmask corresponding to all interfaces
        ::= { docsDevNmAccessEntry 6 }


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docsDevNmAccessStatus OBJECT-TYPE
        SYNTAX      RowStatus
        MAX-ACCESS  read-create
        STATUS      current
        DESCRIPTION
            "Controls and reflects the status of rows in this table."
        ::= { docsDevNmAccessEntry 7 }

--
--  Procedures for using the following group are described in section
--  3.2.1
--

docsDevSoftware OBJECT IDENTIFIER ::= { docsDevMIBObjects 3 }

docsDevSwServer OBJECT-TYPE
        SYNTAX      IpAddress
        MAX-ACCESS  read-write
        STATUS      current
        DESCRIPTION
            "The address of the TFTP server used for software upgrades."
        ::= { docsDevSoftware 1 }

docsDevSwFilename OBJECT-TYPE
        SYNTAX      DisplayString (SIZE (0..64))
        MAX-ACCESS  read-write
        STATUS      current
        DESCRIPTION
            "The file name of the software image to be loaded into this
             device. Unless set via SNMP, this is the file name
             specified by the provisioning server that corresponds to
             the software version that is desired for this device.
             If unknown, the string '(unknown)' is returned."
        ::= { docsDevSoftware 2 }

docsDevSwAdminStatus OBJECT-TYPE
        SYNTAX INTEGER {
            upgradeFromMgt(1),
            allowProvisioningUpgrade(2),
            ignoreProvisioningUpgrade(3)
        }
        MAX-ACCESS  read-write
        STATUS      current
        DESCRIPTION
            "If set to upgradeFromMgt(1), the device will initiate a
             TFTP software image download using docsDevSwFilename.
             After successfully receiving an image, the device will
             set its state to ignoreProvisioningUpgrade(3) and reboot.
             If the download process is interrupted by a reset or
             power failure, the device will load the previous image
             and, after re-initialization, continue to attempt loading
             the image specified in docsDevSwFilename.


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             If set to allowProvisioningUpgrade(2), the device will
             use the software version information supplied by the
             provisioning server when next rebooting (this does not
             cause a reboot).

             When set to ignoreProvisioningUpgrade(3), the device
             will disregard software image upgrade information from the
             provisioning server.

             Note that reading this object can return upgradeFromMgt(1).
             This indicates that a software download is currently in
             progress, and that the device will reboot after
             successfully receiving an image."
        ::= { docsDevSoftware 3 }

docsDevSwOperStatus OBJECT-TYPE
        SYNTAX INTEGER {
            inProgress(1),
            completeFromProvisioning(2),
            completeFromMgt(3),
            failed(4),
            other(5)
        }
        MAX-ACCESS  read-only
        STATUS      current
        DESCRIPTION
            "InProgress(1) indicates that a TFTP download is underway,
             either as a result of a version mismatch at provisioning
             or as a result of a upgradeFromMgt request.
             CompleteFromProvisioning(2) indicates that the last
             software upgrade was a result of version mismatch at
             provisioning. CompleteFromMgt(3) indicates that the last
             software upgrade was a result of setting
             docsDevSwAdminStatus to upgradeFromMgt.
             Failed(4) indicates that the last attempted download
             failed, ordinarily due to TFTP timeout."
        ::= { docsDevSoftware 4 }


--
-- The following group describes server access and parameters used for
-- initial provisioning and bootstrapping.
--

docsDevServer OBJECT IDENTIFIER ::= { docsDevMIBObjects 4 }

docsDevServerBootState OBJECT-TYPE
        SYNTAX INTEGER {
            operational(1),
            disabled(2),
            waitingForDhcpOffer(3),
            waitingForDhcpResponse(4),


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            waitingForTimeServer(5),
            waitingForTftp(6),
            refusedByCmts(7),
            forwardingDenied(8),
            other(9),
            unknown(10)
        }
        MAX-ACCESS  read-only
        STATUS      current
        DESCRIPTION
            "If operational(1), the device has completed loading and
             processing of configuration parameters and the CMTS has
             completed the Registration exchange.
             If disabled(2) then the device was administratively
             disabled, possibly by being refused network access in the
             configuration file.
             If waitingForDhcpOffer(3) then a DHCP Discover has been
             transmitted and no offer has yet been received.
             If waitingForDhcpResponse(4) then a DHCP Request has been
             transmitted and no response has yet been received.
             If waitingForTimeServer(5) then a Time Request has been
             transmitted and no response has yet been received.
             If waitingForTftp(6) then a request to the TFTP parameter
             server has been made and no response received.
             If refusedByCmts(7) then the Registration Request/Response
             exchange with the CMTS failed.
             If forwardingDenied(8) then the registration process
             completed, but the network access option in the received
             configuration file prohibits forwarding. "
        ::= { docsDevServer 1 }

docsDevServerDhcp OBJECT-TYPE
        SYNTAX      IpAddress
        MAX-ACCESS  read-only
        STATUS      current
        DESCRIPTION
            "The IP address of the DHCP server that assigned an IP
             address to this device. Returns 0.0.0.0 if DHCP was not
             used for IP address assignment."
        ::= { docsDevServer 2 }

docsDevServerTime OBJECT-TYPE
        SYNTAX      IpAddress
        MAX-ACCESS  read-only
        STATUS      current
        DESCRIPTION
            "The IP address of the Time server (RFC-868)."
        ::= { docsDevServer 3 }

docsDevServerTftp OBJECT-TYPE
        SYNTAX      IpAddress
        MAX-ACCESS  read-only


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        STATUS      current
        DESCRIPTION
            "The IP address of the TFTP server responsible for
             downloading provisioning and configuration parameters
             to this device."
        ::= { docsDevServer 4 }

docsDevServerConfigFile OBJECT-TYPE
        SYNTAX      DisplayString
        MAX-ACCESS  read-only
        STATUS      current
        DESCRIPTION
            "The name of the device configuration file read from the
             TFTP server."
        ::= { docsDevServer 5 }

--
--  Event Reporting
--

docsDevEvent OBJECT IDENTIFIER ::= { docsDevMIBObjects 5 }

docsDevEvControl OBJECT-TYPE
        SYNTAX INTEGER {
            resetLog(1),
            useDefaultReporting(2)
        }
        MAX-ACCESS  read-write
        STATUS      current
        DESCRIPTION
            "Setting this object to resetLog(1) empties the event log.
             All data is deleted. Setting it to useDefaultReporting(2)
             returns all event priorities to their factory-default
             reporting. Reading this object always returns
             useDefaultReporting(2)."
        ::= { docsDevEvent 1 }

docsDevEvSyslog OBJECT-TYPE
        SYNTAX      IpAddress
        MAX-ACCESS  read-write
        STATUS      current
        DESCRIPTION
            "The IP address of the Syslog server. If 0.0.0.0, syslog
             transmission is inhibited."
        ::= { docsDevEvent 2 }

docsDevEvThrottleAdminStatus OBJECT-TYPE
        SYNTAX INTEGER {
            unconstrained(1),
            maintainBelowThreshold(2),
            stopAtThreshold(3),
            inhibited(4)


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        }
        MAX-ACCESS  read-write
        STATUS      current
        DESCRIPTION
            "Controls the transmission of traps and syslog messages
             with respect to the trap pacing threshold.
             unconstrained(1) causes traps and syslog messages to be
             transmitted without regard to the threshold settings.
             maintainBelowThreshold(2) causes trap transmission and
             syslog messages to be suppressed if the number of traps
             would otherwise exceed the threshold.
             stopAtThreshold(3) causes trap transmission to cease
             at the threshold, and not resume until directed to do so.
             inhibited(4) causes all trap transmission and syslog
             messages to be suppressed.

             A single event is always treated as a single event for
             threshold counting. That is, an event causing both a trap
             and a syslog message is still treated as a single event.

             Writing to this object resets the thresholding state."
        ::= { docsDevEvent 3 }

docsDevEvThrottleInhibited OBJECT-TYPE
        SYNTAX      TruthValue
        MAX-ACCESS  read-only
        STATUS      current
        DESCRIPTION
            "If true(1), trap and syslog transmission is currently
             inhibited due to thresholds and/or the current setting of
             docsDevEvThrottleAdminStatus."
        ::= { docsDevEvent 4 }

docsDevEvThrottleThreshold OBJECT-TYPE
        SYNTAX      Unsigned32
        MAX-ACCESS  read-write
        STATUS      current
        DESCRIPTION
            "Number of trap/syslog events per docsDevEvThrottleInterval
             to be transmitted before throttling.

             A single event is always treated as a single event for
             threshold counting. That is, an event causing both a trap
             and a syslog message is still treated as a single event."
        ::= { docsDevEvent 5 }

docsDevEvThrottleInterval OBJECT-TYPE
        SYNTAX      INTEGER(1..2147483647)
        UNITS       "seconds"
        MAX-ACCESS  read-write
        STATUS      current
        DESCRIPTION


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            "The interval over which the trap threshold applies."
        ::= { docsDevEvent 6 }

--
-- The following table controls the reporting of the various classes of
-- events. For each event priority,
-- a combination of logging and reporting mechanisms may be chosen. The
-- mapping of event types
-- to priorities is vendor-dependent. Vendors may also choose to allow
-- the user to control that mapping
-- through proprietary means.

docsDevEvControlTable OBJECT-TYPE
        SYNTAX      SEQUENCE OF DocsDevEvControlEntry
        MAX-ACCESS  not-accessible
        STATUS      current
        DESCRIPTION
            "Allows control of the reporting of event classes."
        ::= {  docsDevEvent 7 }


docsDevEvControlEntry OBJECT-TYPE
        SYNTAX      DocsDevEvControlEntry
        MAX-ACCESS  not-accessible
        STATUS      current
        DESCRIPTION
            "Allows configuration of the reporting mechanisms for a
             particular event priority."
        INDEX { docsDevEvPriority }
        ::= { docsDevEvControlTable 1 }

DocsDevEvControlEntry ::= SEQUENCE {
            docsDevEvPriority        INTEGER,
            docsDevEvReporting       BITS
        }

docsDevEvPriority OBJECT-TYPE
        SYNTAX INTEGER {
            emergency(1),
            alert(2),
            critical(3),
            error(4),
            warning(5),
            notice(6),
            information(7),
            debug(8)
        }
        MAX-ACCESS  not-accessible
        STATUS      current
        DESCRIPTION
            "The priority level that is controlled by this entry."
        ::= { docsDevEvControlEntry 1 }


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docsDevEvReporting OBJECT-TYPE
        SYNTAX BITS {
            local(0),
            traps(1),
            syslog(2)
        }
        MAX-ACCESS  read-write
        STATUS      current
        DESCRIPTION
            "Defines the action to be taken on occurrence of this
             event class. Implementations may not necessarily support
             all options for all event classes, but at minimum must
             allow traps and syslogging to be disabled."
        ::= { docsDevEvControlEntry 2 }

docsDevEventTable OBJECT-TYPE
        SYNTAX      SEQUENCE OF DocsDevEventEntry
        MAX-ACCESS  not-accessible
        STATUS      current
        DESCRIPTION
            "Contains a log of network and device events that may be
             of interest in fault isolation and troubleshooting."
        ::= {  docsDevEvent 8 }

docsDevEventEntry OBJECT-TYPE
        SYNTAX      DocsDevEventEntry
        MAX-ACCESS  not-accessible
        STATUS      current
        DESCRIPTION
            "Describes a network or device event that may be of
             interest in fault isolation and troubleshooting."
        INDEX { docsDevEvIndex }
        ::= { docsDevEventTable 1 }

DocsDevEventEntry ::= SEQUENCE {
            docsDevEvIndex           INTEGER,
            docsDevEvFirstTime       DateAndTime,
            docsDevEvLastTime        DateAndTime,
            docsDevEvCount           Counter32,
            docsDevEvLevel           INTEGER,
            docsDevEvId              Unsigned32,
            docsDevEvText            DisplayString
        }

docsDevEvIndex OBJECT-TYPE
        SYNTAX      INTEGER (1..2147483647)
        MAX-ACCESS  not-accessible
        STATUS      current
        DESCRIPTION
            "Provides relative ordering of the objects in the event
             log. This object will always increase except when
             (a) the log is reset via docsDevEvControl,


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             (b) the device reboots and does not implement nonvolatile
             storage for this log, or (c) it reaches the value 2^31.
             The next entry for all the above cases is 1."
        ::= { docsDevEventEntry 1 }

docsDevEvFirstTime OBJECT-TYPE
        SYNTAX      DateAndTime
        MAX-ACCESS  read-only
        STATUS      current
        DESCRIPTION
            "The time that this entry was created."
        ::= { docsDevEventEntry 2 }

docsDevEvLastTime OBJECT-TYPE
        SYNTAX      DateAndTime
        MAX-ACCESS  read-only
        STATUS      current
        DESCRIPTION
            "If multiple events are reported via the same entry, the
             time that the last event for this entry occurred."
        ::= { docsDevEventEntry 3 }

docsDevEvCount OBJECT-TYPE
        SYNTAX      Counter32
        MAX-ACCESS  read-only
        STATUS      current
        DESCRIPTION
            "The number of consecutive event instances reported by
             this entry."
        ::= { docsDevEventEntry 4 }

docsDevEvLevel OBJECT-TYPE
        SYNTAX INTEGER {
            emergency(1),
            alert(2),
            critical(3),
            error(4),
            warning(5),
            notice(6),
            information(7),
            debug(8)
        }
        MAX-ACCESS  read-only
        STATUS      current
        DESCRIPTION
            "The priority level of this event."
        ::= { docsDevEventEntry 5 }

--
-- Vendors will provide their own enumerations for the following.
-- The interpretation of the enumeration is unambiguous for a
-- particular value of the vendor's enterprise number in sysObjectID.


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--

docsDevEvId OBJECT-TYPE
        SYNTAX      Unsigned32
        MAX-ACCESS  read-only
        STATUS      current
        DESCRIPTION
            "For this product, uniquely identifies the type of event
             that is reported by this entry."
        ::= { docsDevEventEntry 6 }

docsDevEvText OBJECT-TYPE
        SYNTAX      DisplayString
        MAX-ACCESS  read-only
        STATUS      current
        DESCRIPTION
            "Provides a human-readable description of the event,
             including all relevant context (interface numbers,
             etc.)."
        ::= { docsDevEventEntry 7 }

docsDevFilter OBJECT IDENTIFIER ::= { docsDevMIBObjects 6 }

-- LLC filters can be defined on an inclusive or exclusive basis: CMs
-- can be configured to forward only packets matching a set of layer
-- three protocols,  or to drop packets matching a set of layer three
-- protocols.

docsDevFilterLLCDefault OBJECT-TYPE
        SYNTAX INTEGER {
            discard(1),
            accept(2)
        }
        MAX-ACCESS  read-write
        STATUS      current
        DESCRIPTION
            "If set to discard(1), all packets not matching an LLC
             filter will be discarded. If set to accept(2), all
             packets not matching an LLC filter will be accepted for
             further processing (e.g., bridging)."
        ::= { docsDevFilter 1 }

docsDevFilterLLCTable OBJECT-TYPE
        SYNTAX      SEQUENCE OF DocsDevFilterLLCEntry
        MAX-ACCESS  not-accessible
        STATUS      current
        DESCRIPTION
            "A list of filters to apply to (bridged) LLC traffic, which
             forwards or drops packets on the basis of the layer three
             protocol type."
        ::= { docsDevFilter 2 }


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docsDevFilterLLCEntry OBJECT-TYPE
        SYNTAX      DocsDevFilterLLCEntry
        MAX-ACCESS  not-accessible
        STATUS      current
        DESCRIPTION
            "Describes a single filter to apply to (bridged) LLC traffic
             received on a specified interface. "
        INDEX { docsDevFilterLLCIndex }
        ::= { docsDevFilterLLCTable 1 }

DocsDevFilterLLCEntry ::= SEQUENCE {
            docsDevFilterLLCIndex               INTEGER,
            docsDevFilterLLCStatus              RowStatus,
            docsDevFilterLLCIfIndex             InterfaceIndexOrZero,
            docsDevFilterLLCProtocolType        INTEGER,
            docsDevFilterLLCProtocol            INTEGER,
            docsDevFilterLLCMatches             Counter32
        }

docsDevFilterLLCIndex OBJECT-TYPE
        SYNTAX      INTEGER (1..2147483647)
        MAX-ACCESS  not-accessible
        STATUS      current
        DESCRIPTION
            "Index used for the identification of filters (note that LLC
             filter order is irrelevant)."
        ::= { docsDevFilterLLCEntry 1 }

docsDevFilterLLCStatus OBJECT-TYPE
        SYNTAX      RowStatus
        MAX-ACCESS  read-create
        STATUS      current
        DESCRIPTION
            "Controls and reflects the status of rows in this table."
        ::= { docsDevFilterLLCEntry 2}

docsDevFilterLLCIfIndex OBJECT-TYPE
        SYNTAX      InterfaceIndexOrZero
        MAX-ACCESS  read-create
        STATUS      current
        DESCRIPTION
            "The entry interface to which this filter applies.
             The value corresponds to ifIndex for either a CATV MAC
             or another network interface. If the value is zero, the
             filter applies to all interfaces. In Cable Modems, the
             default value is the customer side interface. In Cable
             Modem Termination Systems, this object has to be
             specified to create a row in this table."
        ::= { docsDevFilterLLCEntry 3 }

docsDevFilterLLCProtocolType OBJECT-TYPE
        SYNTAX INTEGER {


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            ethertype(1),
            dsap(2)
        }
        MAX-ACCESS  read-create
        STATUS      current
        DESCRIPTION
            "The format of the value in docsDevFilterLLCProtocol:
             either a two-byte Ethernet Ethertype, or a one-byte
             802.2 SAP value. EtherType(1) also applies to SNAP-
             encapsulated frames."
        DEFVAL { ethertype }
        ::= { docsDevFilterLLCEntry 4 }

docsDevFilterLLCProtocol OBJECT-TYPE
        SYNTAX      INTEGER (0..65535)
        MAX-ACCESS  read-create
        STATUS      current
        DESCRIPTION
            "The layer three protocol for which this filter applies.
             The protocol value format depends on
             docsDevFilterLLCProtocolType. Note that for SNAP frames,
             etherType filtering is performed rather than DSAP=0xAA."
        DEFVAL { 0 }
        ::= { docsDevFilterLLCEntry 5 }

docsDevFilterLLCMatches OBJECT-TYPE
        SYNTAX      Counter32
        MAX-ACCESS  read-only
        STATUS      current
        DESCRIPTION
            "Counts the number of times this filter was matched."
        ::= { docsDevFilterLLCEntry 6 }

-- The default behavior for (bridged) packets that do not match IP
-- filters is defined by
-- docsDevFilterIpDefault.

docsDevFilterIpDefault OBJECT-TYPE
        SYNTAX INTEGER {
            discard(1),
            accept(2)
        }
        MAX-ACCESS  read-write
        STATUS      current
        DESCRIPTION
            "If set to discard(1), all packets not matching an IP filter
             will be discarded. If set to accept(2), all packets not
             matching an IP filter will be accepted for further
             processing (e.g., bridging)."
        ::= { docsDevFilter 3 }

docsDevFilterIpTable OBJECT-TYPE


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        SYNTAX      SEQUENCE OF DocsDevFilterIpEntry
        MAX-ACCESS  not-accessible
        STATUS      current
        DESCRIPTION
            "An ordered list of filters to apply to IP traffic. Filter
             application is ordered by the filter index, rather than
             by a best match algorithm. Packets which match no filters
             are discarded or forwarded according to the setting of
             docsDevFilterIpDefault."
        ::= { docsDevFilter 4 }

docsDevFilterIpEntry OBJECT-TYPE
        SYNTAX      DocsDevFilterIpEntry
        MAX-ACCESS  not-accessible
        STATUS      current
        DESCRIPTION
            "Describes a filter to apply to IP traffic received on a
             specified interface. Both source and destination addresses
             must match for the filter to apply."
        INDEX { docsDevFilterIpIndex }
        ::= { docsDevFilterIpTable 1 }

DocsDevFilterIpEntry ::= SEQUENCE {
            docsDevFilterIpIndex             INTEGER,
            docsDevFilterIpStatus            RowStatus,
            docsDevFilterIpControl           INTEGER,
            docsDevFilterIpIfIndex           InterfaceIndexOrZero,
            docsDevFilterIpDirection         INTEGER,
            docsDevFilterIpBroadcast         TruthValue,
            docsDevFilterIpSaddr             IpAddress,
            docsDevFilterIpSmask             IpAddress,
            docsDevFilterIpDaddr             IpAddress,
            docsDevFilterIpDmask             IpAddress,
            docsDevFilterIpProtocol          INTEGER,
            docsDevFilterIpSourcePortLow     INTEGER,
            docsDevFilterIpSourcePortHigh    INTEGER,
            docsDevFilterIpDestPortLow       INTEGER,
            docsDevFilterIpDestPortHigh      INTEGER,
            docsDevFilterIpMatches           Counter32
        }

docsDevFilterIpIndex OBJECT-TYPE
        SYNTAX      INTEGER (1..2147483647)
        MAX-ACCESS  not-accessible
        STATUS      current
        DESCRIPTION
            "Index used to order the application of filters.
             The filter with the lowest index is always applied
             first."
        ::= { docsDevFilterIpEntry 1 }

docsDevFilterIpStatus OBJECT-TYPE


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        SYNTAX      RowStatus
        MAX-ACCESS  read-create
        STATUS      current
        DESCRIPTION
            "Controls and reflects the status of rows in this table."
        ::= { docsDevFilterIpEntry 2 }

docsDevFilterIpControl OBJECT-TYPE
        SYNTAX INTEGER {
            discard(1),
            accept(2)
        }
        MAX-ACCESS  read-create
        STATUS      current
        DESCRIPTION
            "If set to discard(1), all packets matching this filter
             will be discarded and scanning of the remainder of the
             filter list will be aborted. If set to accept(2), all
             packets matching this filter will be accepted for further
             processing (e.g., bridging) and scanning of the remainder
             of the filter list will be aborted. "
        DEFVAL { discard }
        ::= { docsDevFilterIpEntry 3 }

docsDevFilterIpIfIndex OBJECT-TYPE
        SYNTAX      InterfaceIndexOrZero
        MAX-ACCESS  read-create
        STATUS      current
        DESCRIPTION
            "The entry interface to which this filter applies. The
             value corresponds to ifIndex for either a CATV MAC or
             another network interface. If the value is zero, the
             filter applies to all interfaces. Default value in Cable
             Modems is the customer-side interface. In Cable Modem
             Termination Systems, this object has to be specified to
             create a row in this table."
        ::= { docsDevFilterIpEntry 4 }

docsDevFilterIpDirection OBJECT-TYPE
        SYNTAX INTEGER {
            inbound(1),
            outbound(2),
            both(3)
        }
        MAX-ACCESS  read-create
        STATUS      current
        DESCRIPTION
            "Determines whether the filter is applied to inbound(1)
             traffic, outbound(2) traffic, or traffic in both(3)
             directions."
        DEFVAL { inbound }
        ::= { docsDevFilterIpEntry 5 }


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docsDevFilterIpBroadcast OBJECT-TYPE
        SYNTAX      TruthValue
        MAX-ACCESS  read-create
        STATUS      current
        DESCRIPTION
            "If set to true(1), the filter only applies to multicast
             and broadcast traffic. If set to false(2), the filter
             applies to all traffic."
        DEFVAL { false }
        ::= { docsDevFilterIpEntry 6 }

docsDevFilterIpSaddr OBJECT-TYPE
        SYNTAX      IpAddress
        MAX-ACCESS  read-create
        STATUS      current
        DESCRIPTION
            "The source IP address, or portion thereof, that is to be
             matched for this filter."
        DEFVAL { '00000000'h }
        ::= { docsDevFilterIpEntry 7 }

docsDevFilterIpSmask OBJECT-TYPE
        SYNTAX      IpAddress
        MAX-ACCESS  read-create
        STATUS      current
        DESCRIPTION
            "A bit mask that is to be applied to the source address
             prior to matching. This mask is not necessarily the same
             as a subnet mask, but 1's bits must be leftmost and
             contiguous."
        DEFVAL { '00000000'h }
        ::= { docsDevFilterIpEntry 8 }

docsDevFilterIpDaddr OBJECT-TYPE
        SYNTAX      IpAddress
        MAX-ACCESS  read-create
        STATUS      current
        DESCRIPTION
            "The destination IP address, or portion thereof, that is
             to be matched for this filter "
        DEFVAL { '00000000'h }
        ::= { docsDevFilterIpEntry 9 }

docsDevFilterIpDmask OBJECT-TYPE
        SYNTAX      IpAddress
        MAX-ACCESS  read-create
        STATUS      current
        DESCRIPTION
            "A bit mask that is to be applied to the destination
             address prior to matching. This mask is not necessarily
             the same as a subnet mask, but 1's bits must be leftmost
             and contiguous "


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        DEFVAL { '00000000'h }
        ::= { docsDevFilterIpEntry 10 }

docsDevFilterIpProtocol OBJECT-TYPE
        SYNTAX INTEGER {
            icmp(1),
            tcp(6),
            udp(17),
            any(256)
        }
        MAX-ACCESS  read-create
        STATUS      current
        DESCRIPTION
            "The IP protocol value that is to be matched."
        DEFVAL { any }
        ::= { docsDevFilterIpEntry 11 }

docsDevFilterIpSourcePortLow OBJECT-TYPE
        SYNTAX      INTEGER (0..65535)
        MAX-ACCESS  read-create
        STATUS      current
        DESCRIPTION
            "If docsDevFilterIpProtocol is udp or tcp, this is the
             inclusive lower bound of the transport-layer source port
             range that is to be matched."
        DEFVAL { 0 }
        ::= { docsDevFilterIpEntry 12 }

docsDevFilterIpSourcePortHigh OBJECT-TYPE
        SYNTAX      INTEGER (0..65535)
        MAX-ACCESS  read-create
        STATUS      current
        DESCRIPTION
            "If docsDevFilterIpProtocol is udp or tcp, this is the
             inclusive upper bound of the transport-layer source port
             range that is to be matched."
        DEFVAL { 65535 }
        ::= { docsDevFilterIpEntry 13 }

docsDevFilterIpDestPortLow OBJECT-TYPE
        SYNTAX      INTEGER (0..65535)
        MAX-ACCESS  read-create
        STATUS      current
        DESCRIPTION
            "If docsDevFilterIpProtocol is udp or tcp, this is the
             inclusive lower bound of the transport-layer destination
             port range that is to be matched."
        DEFVAL { 0 }
        ::= { docsDevFilterIpEntry 14 }

docsDevFilterIpDestPortHigh OBJECT-TYPE
        SYNTAX      INTEGER (0..65535)


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        MAX-ACCESS  read-create
        STATUS      current
        DESCRIPTION
            "If docsDevFilterIpProtocol is udp or tcp, this is the
             inclusive upper bound of the transport-layer destination
             port range that is to be matched."
        DEFVAL { 65535 }
        ::= { docsDevFilterIpEntry 15 }

docsDevFilterIpMatches OBJECT-TYPE
        SYNTAX      Counter32
        MAX-ACCESS  read-only
        STATUS      current
        DESCRIPTION
            "Counts the number of times this filter was matched."
        ::= { docsDevFilterIpEntry 16 }

--
-- Placeholder for notifications/traps.
--
docsDevNotification OBJECT IDENTIFIER   ::= { docsDev 2 }


--
-- Conformance definitions
--
docsDevConformance  OBJECT IDENTIFIER   ::= { docsDev 3 }
docsDevGroups       OBJECT IDENTIFIER   ::= { docsDevConformance 1 }
docsDevCompliances  OBJECT IDENTIFIER   ::= { docsDevConformance 2 }

docsDevBasicCompliance MODULE-COMPLIANCE
        STATUS  current
        DESCRIPTION
            "The compliance statement for MCNS Cable Modems and
             Cable Modem Termination Systems."

MODULE  -- docsDev

-- conditionally mandatory groups

GROUP docsDevBaseGroup
        DESCRIPTION
            "Mandatory in Cable Modems, optional in Cable Modem
             Termination Systems."

GROUP docsDevEventGroup
        DESCRIPTION
            "Mandatory in Cable Modems, optional in Cable Modem
             Termination Systems."

GROUP docsDevFilterGroup
        DESCRIPTION


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            "Mandatory in Cable Modems, optional in Cable Modem
             Termination Systems."

GROUP docsDevNmAccessGroup
        DESCRIPTION
            "Mandatory in Cable Modems, optional in Cable Modem
             Termination Systems."

GROUP docsDevServerGroup
        DESCRIPTION
            "This group is implemented only in Cable Modems,
             not in Cable Modem Termination Systems."

GROUP docsDevSoftwareGroup
        DESCRIPTION
            "Mandatory in Cable Modems, optional in Cable Modem
             Termination Systems."

OBJECT docsDevSTPControl
        MIN-ACCESS read-only
        DESCRIPTION
            "It is compliant to implement this object as read-only.
             Devices need only support noStFilterBpdu(2)."

OBJECT docsDevEvReporting
         MIN-ACCESS read-only
         DESCRIPTION
             "It is compliant to implement this object as read-only.
              Devices need only support local(0)."

         ::= { docsDevCompliances 1 }

docsDevBaseGroup OBJECT-GROUP
        OBJECTS {
             docsDevRole,
             docsDevDateTime,
             docsDevResetNow,
             docsDevSerialNumber,
             docsDevSTPControl
        }
        STATUS      current
        DESCRIPTION
            "A collection of objects providing device status and
             control."
        ::= { docsDevGroups 1 }

docsDevNmAccessGroup OBJECT-GROUP
        OBJECTS {
             docsDevNmAccessIp,
             docsDevNmAccessIpMask,
             docsDevNmAccessCommunity,
             docsDevNmAccessControl,


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             docsDevNmAccessInterfaces,
             docsDevNmAccessStatus
        }
        STATUS      current
        DESCRIPTION
            "A collection of objects for controlling access to SNMP
             objects."
        ::= { docsDevGroups 2 }

docsDevSoftwareGroup OBJECT-GROUP
        OBJECTS {
            docsDevSwServer,
            docsDevSwFilename,
            docsDevSwAdminStatus,
            docsDevSwOperStatus
        }
        STATUS      current
        DESCRIPTION
            "A collection of objects for controlling software
             downloads."
        ::= { docsDevGroups 3 }

docsDevServerGroup OBJECT-GROUP
        OBJECTS {
            docsDevServerBootState,
            docsDevServerDhcp,
            docsDevServerTime,
            docsDevServerTftp,
            docsDevServerConfigFile
        }
        STATUS      current
        DESCRIPTION
            "A collection of objects providing status about server
             provisioning."
        ::= { docsDevGroups 4 }

docsDevEventGroup OBJECT-GROUP
        OBJECTS {
            docsDevEvControl,
            docsDevEvSyslog,
            docsDevEvThrottleAdminStatus,
            docsDevEvThrottleInhibited,
            docsDevEvThrottleThreshold,
            docsDevEvThrottleInterval,
            docsDevEvReporting,
            docsDevEvFirstTime,
            docsDevEvLastTime,
            docsDevEvCount,
            docsDevEvLevel,
            docsDevEvId,
            docsDevEvText
        }


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        STATUS      current
        DESCRIPTION
            "A collection of objects used to control and monitor
             events."
        ::= { docsDevGroups 5 }

docsDevFilterGroup OBJECT-GROUP
        OBJECTS {
            docsDevFilterLLCDefault,
            docsDevFilterIpDefault,
            docsDevFilterLLCStatus,
            docsDevFilterLLCIfIndex,
            docsDevFilterLLCProtocolType,
            docsDevFilterLLCProtocol,
            docsDevFilterLLCMatches,
            docsDevFilterIpControl,
            docsDevFilterIpIfIndex,
            docsDevFilterIpStatus,
            docsDevFilterIpDirection,
            docsDevFilterIpBroadcast,
            docsDevFilterIpSaddr,
            docsDevFilterIpSmask,
            docsDevFilterIpDaddr,
            docsDevFilterIpDmask,
            docsDevFilterIpProtocol,
            docsDevFilterIpSourcePortLow,
            docsDevFilterIpSourcePortHigh,
            docsDevFilterIpDestPortLow,
            docsDevFilterIpDestPortHigh,
            docsDevFilterIpMatches
        }
        STATUS      current
        DESCRIPTION
            "A collection of objects to specify filters at link layer
             and IP layer."
        ::= { docsDevGroups 6 }

END















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5.  Acknowledgments

This document was produced by the IPCDN Working Group.  It is based on a
document written by Pam Anderson from CableLabs, Wilson Sawyer from
BayNetworks, and Rich Woundy from Continental Cablevision.

Special thanks is also due to Azlina Palmer, who helped a lot reviewing
the document.


6.  References

[1]  SNMPv2 Working Group, Case, J., McCloghrie, K., Rose, M., and
     S. Waldbusser, "Structure of Management Information for Version 2
     of the Simple Network Management Protocol (SNMPv2)", RFC 1902,
     January 1996.

[2]  McCloghrie, K., and M. Rose, Editors, "Management Information Base
     for Network Management of TCP/IP-based internets: MIB-II", STD 17,
     RFC 1213, Hughes LAN Systems, Performance Systems International,
     March 1991.

[3]  Case, J., Fedor, M., Schoffstall, M., and J. Davin, "A Simple
     Network Management Protocol (SNMP)", STD 15, RFC 1157, SNMP
     Research, Performance Systems International, MIT Lab for Computer
     Science, May 1990.

[4]  SNMPv2 Working Group, Case, J., McCloghrie, K., Rose, M. and
     S. Waldbusser, "Protocol Operations for Version 2 of the Simple
     Network Management Protocol (SNMPv2)", RFC 1905, January 1996.

[5]  McCloghrie, K. and F. Kastenholz, "Evolution of the Interfaces
     Group of MIB-II", RFC 1573, Hughes LAN Systems, FTP Software,
     January 1994.

[6]  "MCNS Data Over Cable Services Cable Modem Radio Frequency
     Interface Specification SP-RFID01-970326", MCNS, March 1997.

[7]  L. Steinberg, "Techniques for Managing Asynchronously Generated
     Alerts", RFC 1224, May 1991.

[8]  "MCNS Data Over Cable Services Operations Support System Interface
     Specification SP-OSSII01-970403", MCNS, March 1997.


7.  Security Considerations

The docsDevNmAccessTable limits network management station access to
devices implementing this MIB, thus providing protection against
configuration changes imposed by unauthorized network management
stations.


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It should be noted, however, that this protextion does not prevent
unauthorized access by using wrong IP source address information.  Also,
it should be noted that depending of the SNMP version in use the SNMP
data packets may be transmitted unencrypted.  Dealing with this kind of
security problems is outside the scope of this specification.


8.  Author's Address

     Guenter Roeck
     cisco Systems
     170 West Tasman Drive
     San Jose, CA 95134
     U.S.A.

     Phone: +1 408 527 3143
     Email: groeck@cisco.com




































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