MPLS Working Group Chen. Li
Internet-Draft Lianyuan. Li
Intended status: Standards Track China Mobile
Expires: September 7, 2011 Emily. Chen
Quintin. Zhao
Huawei Technologies
March 6, 2011
Management Information Base for MPLS LDP Multi Topology
draft-li-mpls-ldp-mt-mib-00
Abstract
This memo defines an portion of the Management Information Base (MIB)
for use with network management protocols in the Internet community.
In particular, it describes a MIB module for Multi-Topology Networks
over Multi-protocol Label Switching(MPLS) Label Switching
Routers(LSRs).
Status of this Memo
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet-
Drafts is at http://datatracker.ietf.org/drafts/current/.
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 "work in progress."
This Internet-Draft will expire on September 7, 2011.
Copyright Notice
Copyright (c) 2011 IETF Trust and the persons identified as the
document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents
(http://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents
carefully, as they describe your rights and restrictions with respect
to this document. Code Components extracted from this document must
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include Simplified BSD License text as described in Section 4.e of
the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. The Internet-Standard Management Framework . . . . . . . . . . 3
3. Overview of MT-MPLS-STD-MIB objects . . . . . . . . . . . . . 3
4. MPLS-LDP-MT-STD-MIB Module Definitions . . . . . . . . . . . . 5
5. Security Considerations . . . . . . . . . . . . . . . . . . . 14
6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 14
7. Normative References . . . . . . . . . . . . . . . . . . . . . 14
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 15
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1. Introduction
There are increasing requirements to support multi-topology in MPLS
network. For example, service providers want to assign different
level of service(s) to different topologies so that the service
separation can be achieved. It is also possible to have an in-band
management network on top of the original MPLS topology, or maintain
separate routing and MPLS domains for isolated multicast or IPv6
islands within the backbone, or force a subset of an address space to
follow a different MPLS topology for the purpose of security, QoS or
simplified management and/or operations.
For a detailed overview of the multi topology, please refer to
draft-zhao-mpls-ldp-multi-topology-01.
2. The Internet-Standard Management Framework
For a detailed overview of the documents that describe the current
Internet-Standard Management Framework, please refer to section 7 of
RFC 3410[RFC3410] . Managed objects are accessed via a virtual
information store, termed the Management Information Base or MIB.
MIB objects are generally accessed through the Simple Network
Management Protocol (SNMP). Objects in the MIB are defined using the
mechanisms defined in the Structure of Management Information (SMI).
This memo specifies a MIB module that is compliant to the SMIv2,
which is described in STD 58, RFC 2578[RFC2578], STD 58, RFC
2579[RFC2579] and STD 58, RFC 2580[RFC2580]
3. Overview of MT-MPLS-STD-MIB objects
The following subsections describe the purpose of each of the objects
contained in the MT-MPLS-STD-MIB.
3.1. MPLS LDP MT Entity Table
The mplsLdpEntityTable specificed in [RFC3815] is used to configure
information which is used by the LDP protocol to setup potential LDP
Sessions. The mplsLdpMtEntityTable can be considered as an extention
to mplsLdpEntityTable to setup potential LDP MT Sessions.
Each entry/row in this table represents a single LDP MT Entity.
There is no maximum number of LDP MT Entities specified. However,
there is an mplsLdpMtEntityIndexNext object which should be retrieved
by the command generator prior to creating an LDP MT Entity. If the
mplsLdpMtEntityIndexNext object is zero, this indicates that the LSR/
LER is not able to create another LDP MT Entity at that time.
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3.2. MPLS LDP MT Session Table
Since all the MT related label messages can be advertised by LDP
Sessions in default topology, there is no need to create extra tcp
connection for Multi Topology.
The mplsLdpMtSessionTable is a read-only table. Each entry in this
table represents an MT Session which is related to one or more LDP MT
Entities and only one LDP Session in default topology.
3.3. MPLS LDP MT LSP Table
The Label Information Base (LIB) contains information about labels
learned by the LSR. The LIB for LDP and MPLS-RSVP (i.e., all
currently defined MPLS protocols) is represented in the LSR MIB
[RFC3813]. The LIB is represented by the LSR MIB's mplsXCTable (mpls
Cross Connect Table), mplsInSegmentTable (mpls In Segment Table) and
the mplsOutSegmentTable (mpls Out Segment Table). The mplsXCTable
models the cross-connection of the incoming label with a specific
outgoing label.
In Multi Topology network, the MT-ID TLV can be inserted into the
following LDP messages as an optional parameter during LDP
advertisement, including the following message:
Label Mapping "Label Mapping Message"
Label Request "Label Request Message"
Label Abort Request "Label Abort Request Message"
Label Withdraw "Label Withdraw Message"
Label Release "Label Release Message"
The message with inserted MT-ID TLV associates a FEC in same message
to the topology identified by MT-ID.
3.4. MT statistics Table
MTStatisticsTable is a read-only table which contains statistical
information related to packet passing through the LSP under the
topology. The statistical information includes packets total counts,
delay, jitter and so on.
3.5 MPLS LDP MT Notifications
The mplsLdpMtSessionUp and mplsLdpMtSessionDown notifications are
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generated when there is an appropriate change in the
mplsLdpMtSessionState object, e.g., when sessions change state (Up to
Down for the mplsLdpMtSessionDown notification, or Down to Up for the
mplsLdpMtSessionUp notification).
4. MPLS-LDP-MT-STD-MIB Module Definitions
MPLS-LDP-MT-STD-MIB DEFINITIONS ::= BEGIN
IMPORTS
OBJECT-TYPE, MODULE-IDENTITY, NOTIFICATION-TYPE,
Counter32, Unsigned32
FROM SNMPv2-SMI -- [RFC2578]
MODULE-COMPLIANCE, OBJECT-GROUP, NOTIFICATION-GROUP
FROM SNMPv2-CONF -- [RFC2580]
RowStatus, TimeStamp, StorageType FROM SNMPv2-TC -- [RFC2579]
IndexInteger,
IndexIntegerNextFree
FROM DIFFSERV-MIB -- [RFC3289]
MplsLdpIdentifier,
FROM MPLS-TC-STD-MIB -- [RFC3811]
mplsLdpStdMIB MODULE-IDENTITY
LAST-UPDATED "20110304" -- March 4, 2011
CONTACT-INFO
"To be added
Emily Chen (chenying220@huawei.com) Huawei Technologies Co., Ltd."
DESCRIPTION
"This MIB contains managed object definitions for the 'Multiprotocol
Label Switching, Label Distribution Protocol, Multi Topology'
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document."
::= { mplsLdpMtStdMIB 1 }
-- MPLS LDP MT Entity Table
mplsLdpMtEntityTable OBJECT-TYPE
SYNTAX SEQUENCE OF mplsLdpMtEntityEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"This table contains information about the MPLS Label Distribution
Protocol Entities which exist on this Label Switching Router (LSR) or
Label Edge Router (LER)."
::= { mplsLdpMtEntityObjects 3 }
mplsLdpMtEntityEntry OBJECT-TYPE
SYNTAX mplsLdpMtEntityEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"An entry in this table represents an LDP MT entity. An entry can be
created by a network administrator or by an SNMP agent as instructed
by LDP."
INDEX { mplsLdpMtEntityLdpId, mplsLdpMtEntityIndex }
::= { mplsLdpMtEntityTable 1 }
mplsLdpMtEntityEntry ::= SEQUENCE {
mplsLdpMtEntityLdpId MplsLdpIdentifier,
mplsLdpMtEntityIndex IndexInteger,
mplsLdpMtEntityAdminStatus INTEGER,
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mplsLdpMtEntityStorageType StorageType,
mplsLdpMtEntityRowStatus RowStatus
}
mplsLdpMtEntityLdpId OBJECT-TYPE
SYNTAX MplsLdpIdentifier
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The LDP identifier."
REFERENCE
"RFC3036, LDP Specification, Section on LDP Identifiers."
::= { mplsLdpMtEntityEntry 1 }
mplsLdpMtEntityMtId OBJECT-TYPE
SYNTAX Unsigned32
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The Multi Topology identifier of this LDP MT Entity."
DEFVAL { 0 }
::= { mplsLdpMtEntityEntry 2 }
mplsLdpMtEntityIndex OBJECT-TYPE
SYNTAX IndexInteger
MAX-ACCESS not-accessible
STATUS current
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DESCRIPTION
"This index is used as a secondary index to uniquely identify this
row. Before creating a row in this table, the
'mplsLdpMtEntityIndexNext' object should be retrieved. That value
should be used for the value of this index when creating a row in
this table. NOTE: if a value of zero (0) is retrieved, that
indicates that no rows can be created in this table at this time."
::= { mplsLdpEntityEntry 3 }
mplsLdpMtEntityAdminStatus OBJECT-TYPE
SYNTAX INTEGER {
enable(1),
disable(2)
}
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The administrative status of this LDP MT Entity. If this object is
changed from 'enable' to 'disable' and this entity has already
attempted to establish contact with a MT Session, then all contact
with that MT Session is lost and all information from that MT Session
needs to be removed from the MIB. (This implies that the network
management subsystem should clean up any related entry in the
mplsLdpMtSessionTable.). At this point the operator is able to
change values which are related to this entity. When the admin
status is set back to 'enable', then this MT Entity will attempt to
establish a new MT Session."
DEFVAL { enable }
::= { mplsLdpMtEntityEntry 4 }
mplsLdpMtEntityStorageType OBJECT-TYPE
SYNTAX StorageType
MAX-ACCESS read-create
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STATUS current
DESCRIPTION
"The storage type for this conceptual row. Conceptual rows having
the value 'permanent(4)' need not allow write-access to any columnar
objects in the row."
DEFVAL{ nonVolatile }
::= { mplsLdpMtEntityEntry 5 }
mplsLdpMtEntityRowStatus OBJECT-TYPE
SYNTAX RowStatus
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The status of this conceptual row. All writable objects in this row
may be modified at any time, however, as described in detail in the
section entitled, 'Changing Values After Session Establishment', and
again described in the DESCRIPTION clause of the
mplsLdpMtEntityAdminStatus object, if a session has been initiated
with a Peer, changing objects in this table will wreak havoc with the
session and interrupt traffic. To repeat again: the recommended
procedure is to set the mplsLdpMtEntityAdminStatus to down, thereby
explicitly causing a session to be torn down. Then, change objects
in this entry, then set the mplsLdpMtEntityAdminStatus to enable,
which enables a new session to be initiated."
::= { mplsLdpMtEntityEntry 6 }
-- MPLS LDP MT Session Table
mplsLdpSessionTable OBJECT-TYPE
SYNTAX SEQUENCE OF MplsLdpSessionEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
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"A table of MT Sessions between the LDP MT Entities. Each row in
this table represents a single MT session."
::= { mplsLdpMtSessionObjects 3 }
mplsLdpMtSessionEntry OBJECT-TYPE
SYNTAX mplsLdpMtSessionEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"An entry in this table represents information on a single MT
session. The information contained in a row is read-only."
::= { mplsLdpSessionTable 1 }
mplsLdpMtSessionEntry ::= SEQUENCE {
mplsLdpSessionState INTEGER,
mplsLdpMtSessionStateLastChange TimeStamp,
mplsLdpMtSessionMtId Unsigned32,
}
mplsLdpSessionState OBJECT-TYPE
SYNTAX INTEGER {
initialized(1),
operational(2)
}
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The current state of the MT Session. When the tcp connection in
default topology is established, and both ends have the capability of
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the given MT-ID, the state can change from initialized to
operational."
::= { mplsLdpMtSessionEntry 1 }
mplsLdpMtSessionStateLastChange OBJECT-TYPE
SYNTAX TimeStamp
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The value of sysUpTime at the time this MT Session was created."
::= { mplsLdpMtSessionEntry 2 }
mplsLdpMtSessionMtId OBJECT-TYPE
SYNTAX Unsigned32
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The Multi Topology identifier of this LDP MT Session."
DEFVAL { 0 }
::= { mplsLdpMtSessionEntry 3 }
-- MT LDP LSP Table
MTLdpLspTable OBJECT-TYPE
SYNTAX SEQUENCE OF MTLdpLspTableEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"This table specifies MT LIB label switching information. Entries in
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this table define LIB label switching entries associated with the
specified topology."
::= { mplsLdpMtStdMIB 1 }
MTLdpLspEntry OBJECT-TYPE
SYNTAX MTLdpLspEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"An entry in this table is created by an LSR for every label within
the context of a specific topology capable of supporting MT LDP LSP.
The indexing provides an ordering of topologies per interface."
INDEX { MTLdpLspMtId,
MTLdpLspInLabel,
MTLdpLspOutLabel,
MTLdpLspNHopType,
MTLdpLspNHop,
}
::= { MTLdpLspTable 1 }
MTLdpLspEntry ::= SEQUENCE {
MTLdpLspInLabel MplsLabel,
MTLdpLspOutLabel MplsLabel,
MTLdpLspNHop InterfaceIndexorZero,
}
MTLdpLspInLabel OBJECT-TYPE
SYNTAX MplsLabel
MAX-ACCESS not-accessible
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STATUS current
DESCRIPTION
"The incoming label of the packet, The label should include the MT-ID
TLV of the previous LSR"
::= { MTLdpLspLabelEntry 1 }
DESCRIPTION
"The out label point to next P router, which will replace the
incoming label. the label should carry the MT-ID TLV of the current
LSR. The value of the MT-ID TLV should set non-zero if current LSR
supports Multi topology."
::= { MTLdpLspLabelEntry 2 }
MTLdpLspNHop OBJECT-TYPE
SYNTAX InterfaceIndexOrZero
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The ifIndex value that identifies the local interface through which
the next hop of the packet should be forwarded. A value of 0 is
valid and represents the scenario where no interface is specified."
::= { MTLdpLspLabelEntry 3 }
-- Notifications
mplsLdpMtSessionUp NOTIFICATION-TYPE
OBJECTS {
mplsLdpMtSessionState,
mplsLdpMtSessionMtId,
mplsLdpMtSessionDiscontinuityTime
}
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STATUS current
DESCRIPTION
"If this notification is sent when the value of
'mplsLdpMtSessionState' enters the 'operational(2)' state."
::= { mplsLdpMtNotifications 1 }
mplsLdpMtSessionDown NOTIFICATION-TYPE
OBJECTS {
mplsLdpMtSessionState,
mplsLdpMtSessionMtId,
mplsLdpMtSessionDiscontinuityTime
}
STATUS current
DESCRIPTION
"This notification is sent when the value of 'mplsLdpMtSessionState'
leaves the 'operational(2)' state."
::= { mplsLdpNotifications 2 }
5. Security Considerations
It needs to be further identified.
6. IANA Considerations
It is no necessary to request new IANA code in the draft.
7. Normative References
[RFC3813] C. Srinivasan, Bloomberg L.P., A. Viswanathan,T. Nadeau,
"MPLS/BGP Layer 3 Virtual Private Network (VPN) Management
Information Base", RFC 3813, June 2004.
[RFC3815] J. Cucchiara and H. Sjostrand ,"Definitions of Managed
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Objects for the Multiprotocol Label Switching (MPLS),Label
Distribution Protocol (LDP)",RFC 3815,June 2004.
[RFC3814] C. Srinivasan, Bloomberg L.P., A.
Viswanathan,"Multiprotocol Label Switching (MPLS) Forwarding
Equivalence Class To Next Hop Label Forwarding Entry (FEC-To-NHLFE)
Management Information Base (MIB)", RFC 3814, June 2004.
[RFC5036] L. Andersson,I. Minei,B. Thomas,"LDP Specification",October
2007
[RFC3410] J. Case,R. Mundy,D. Partain,B. Stewart,"Introduction and
Applicability Statements for Internet Standard Management
Framework",December 2002
Authors' Addresses
Chen Li
China Mobile
Unit2, Dacheng Plaza, No. 28 Xuanwumenxi Ave, Xuanwu District
Beijing 100053
P.R. China
Email: lichenyj@chinamobile.com
Lianyuan Li
China Mobile
Unit2, Dacheng Plaza, No. 28 Xuanwumenxi Ave, Xuanwu District
Beijing 100053
P.R. China
Email: lilianyuan@chinamobile.com
Emily Chen
Huawei Technologies
No. 5 Street, Shangdi Information, Haidian
Beijing 100053
P.R. China
Email: chenying220@huawei.com
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Quintin Zhao
Huawei Technologies
125 Nagog Technology Park
Acton, MA 01719
US
Email: qzhao@huawei.com
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