Management Information Base for MPLS LDP Multi Topology
draft-li-mpls-ldp-mt-mib-06

Versions: 00 01 02 03 04 05 06                                          
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



Li, et al.              Expires September 7, 2011               [Page 1]


Internet-Draft             MIB for MPLS LDP MT                March 2011


   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




































Li, et al.              Expires September 7, 2011               [Page 2]


Internet-Draft             MIB for MPLS LDP MT                March 2011


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.



Li, et al.              Expires September 7, 2011               [Page 3]


Internet-Draft             MIB for MPLS LDP MT                March 2011


   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



Li, et al.              Expires September 7, 2011               [Page 4]


Internet-Draft             MIB for MPLS LDP MT                March 2011


   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'



Li, et al.              Expires September 7, 2011               [Page 5]


Internet-Draft             MIB for MPLS LDP MT                March 2011


   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,




Li, et al.              Expires September 7, 2011               [Page 6]


Internet-Draft             MIB for MPLS LDP MT                March 2011


   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




Li, et al.              Expires September 7, 2011               [Page 7]


Internet-Draft             MIB for MPLS LDP MT                March 2011


   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




Li, et al.              Expires September 7, 2011               [Page 8]


Internet-Draft             MIB for MPLS LDP MT                March 2011


   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




Li, et al.              Expires September 7, 2011               [Page 9]


Internet-Draft             MIB for MPLS LDP MT                March 2011


   "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



Li, et al.              Expires September 7, 2011              [Page 10]


Internet-Draft             MIB for MPLS LDP MT                March 2011


   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



Li, et al.              Expires September 7, 2011              [Page 11]


Internet-Draft             MIB for MPLS LDP MT                March 2011


   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



Li, et al.              Expires September 7, 2011              [Page 12]


Internet-Draft             MIB for MPLS LDP MT                March 2011


   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

   }




Li, et al.              Expires September 7, 2011              [Page 13]


Internet-Draft             MIB for MPLS LDP MT                March 2011


   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



Li, et al.              Expires September 7, 2011              [Page 14]


Internet-Draft             MIB for MPLS LDP MT                March 2011


   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








Li, et al.              Expires September 7, 2011              [Page 15]


Internet-Draft             MIB for MPLS LDP MT                March 2011


   Quintin Zhao
   Huawei Technologies
   125 Nagog Technology Park
   Acton, MA  01719
   US

   Email: qzhao@huawei.com












































Li, et al.              Expires September 7, 2011              [Page 16]