Extensions to the Path Computation Element Protocol(PCEP) Management Information Base(MIB) Module
draft-pce-mib-extensions-00

Abstract

This memo defines a portion of the Management Information Base (MIB) for use with network management protocols in the Internet community. In particular, it describes extensions to the managed objects for modeling of the Path Computation Element Communication Protocol (PCEP) for communications between a Path Computation Client (PCC) and a Path Computation Element (PCE), or between two PCEs, that support stateful capabilities.

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 October 9, 2016.

Copyright Notice

Copyright (c) 2016 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 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
• 1.1. Requirements Language
• 1.2. Terminology
• 2. The Internet-Standard Management Framework
• 3. Overview
• 3.1. pcePcepXEntityTable
• 3.2. pcePcepXPeerTable
• 3.3. pcePcepXSessTable
• 4. Object Definitions
• 4.1. PCE-PCEP-MIB
• 5. Security Considerations
• 6. IANA Considerations
• 7. References
• 7.1. Normative References
• 7.2. Informative References
• Authors' Addresses

1. Introduction

The PCE defined in RFC4655 [RFC4655] is an entity that is capable of computing a network path or route based on a network graph and applying computational constraints. A PCC may make requests to a PCE for paths to be computed.

PCEP is the communication protocol between a PCC and PCE and is defined in RFC5440[RFC5440]. PCEP interactions include path computation requests and path computation replies as well as notifications of specific states related to the use of a PCE in the context of Multiprotocol Label Switching (MPLS) and Generalized MPLS (GMPLS) Traffic Engineering (TE).

RFC7420 [RFC7420] defined a MIB module that can be used to monitor PCEP interactions between a PCC and a PCE, or between two PCEs. This memo proposes extensions to the MIB module that can help monitor interactions between PCEP peers that have stateful capabilities as defined in [I-D.ietf-pce-stateful-pce], [I-D.ietf-pce-pce-initiated-lsp] and [I-D.ietf-pce-stateful-sync-optimizations].

The scope of this document is to extend the MIB module for the PCEP base protocol as defined in [RFC7420].

1.1. Requirements Language

The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY" and "OPTIONAL" in this document are to be interpreted as described in BCP 14 [RFC2119].

1.2. Terminology

This document uses the terminology defined in [RFC4655] and [RFC5440], [draft-ietf-pce-stateful-pce-10], [draft-ietf-pce-pce-initiated-lsp-03] and [draft-ietf-pce-stateful-sync-optimizations-02]. In particular, it uses the following acronyms.

• Path Computation Request (PCReq) message.
• Path Computation Reply (PCRep) message.
• Notification (PCNtf) message.
• Error (PCErr) message.
• LSP State Report (PCRpt) message.
• LSP State Update (PCUpd) message.
• LSP Initiate (PCInitiate) message.

This document uses the term "PCEP entity" to refer to a local PCEP speaker, "peer" to refer to a remote PCEP speaker, and "PCEP speaker" where it is not necessary to distinguish between local and remote.

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

The PCEP MIB module contains the following information:

1. PCE and PCC local entity status (see pcePcepEntityTable [RFC7420])
2. PCEP peer information (see pcePcepPeerTable [RFC7420])
3. PCEP session information (see pcePcepSessTable [RFC7420])
4. Notifications to indicate PCEP session changes ([RFC7420])

This document proposes additional "read-only" access fields for the tables pcePcepEntityTable, pcePcepPeerTable and pcePcepSessTable. These new fields will be defined in new tables pcePcepXEntityTable, pcePcepXPeerTable and pcePcepXSessTable that augment pcePcepEntityTable, pcePcepPeerTable and pcePcepSessTable respectively. No changes to, or additional, Notifications are proposed.

These new objects help a user to get information on stateful timers configured, stateful capabilities negotiated by the peers, as well as statistics about different kinds of messages exchanged between PCEP speakers.

3.1. pcePcepXEntityTable

The PCEP MIB module may contain status information for multiple logical local PCEP entities. The pcePcepXEntityTable contains one row for each local PCEP entity. It augments the table pcePcepEntityTable, and is indexed by the object pcePcepEntityIndex defined in pcePcepEntityTable.

This table includes the following information:

1. State timeout interval value configured.
2. Redelegation timeout interval value configured.

The state timeout and redelegation timeout intervals are defined in [draft-ietf-pce-stateful-pce-10], and extended in [draft-ietf-pce-pce-initiated-lsp-03].

3.2. pcePcepXPeerTable

The pcePcepXPeerTable augments the pcePcepPeerTable which contains one row for each peer that the local PCEP entity knows about. Each row is read-only and contains information to identify the peer.

This table includes the following information for each peer:

1. Number of PCRpts sent/received.
2. Number of PCRpts sent/received with different flags on:
   • Sync
   • Delegate
   • Create
   • Remove
3. Number of PCUpds sent/received.
4. Number of PCupds sent/received with different flags on.
   • Sync
   • Delegate

5. Number of PCInitiates sent/received
6. Number of PCInitiates sent/received with different flags on.
   • Create
   • Remove

For PCUpds, the sync flag is used only in the case of PCE triggered initial sync and PCE triggered resync as defined in [draft-ietf-pce-stateful-sync-optimizations-02].

3.3. pcePcepXSessTable

The pcePcepXSessTable augments the pcePcepSessTable. The pcePcepSessTable contains one row for each PCEP session that the PCEP entity (PCE or PCC) is currently participating in.

The statistics in pcePcepSessTable are semantically different from those in pcePcepPeerTable since the former applies to the current session only, whereas the latter is the aggregate for all sessions that have existed to that peer.

The pcePcepXSessTable will include the same information as in pcePcepXPeerTable, but for each session. Apart from those fields described in 3.2, it has the following additional information.

1. Stateful capabilities negotiated on the session. This is the intersection of the capabilities advertised by the local entity and the remote peer.

4. Object Definitions

4.1. PCE-PCEP-MIB

PCE-PCEP-MIB DEFINITIONS ::= BEGIN

   IMPORTS
      MODULE-IDENTITY,
      OBJECT-TYPE,
      mib-2,
      NOTIFICATION-TYPE,
      Unsigned32,
      Counter32
		     FROM SNMPv2-SMI             -- RFC 2578
      TruthValue,
      TimeStamp
		     FROM SNMPv2-TC              -- RFC 2579
      MODULE-COMPLIANCE,
      OBJECT-GROUP,
      NOTIFICATION-GROUP
		     FROM SNMPv2-CONF            -- RFC 2580
      InetAddressType,
      InetAddress
		     FROM INET-ADDRESS-MIB;      -- RFC 4001

   pcePcepMIB MODULE-IDENTITY
       LAST-UPDATED
           "201412171200Z" -- 17 December 2014
       ORGANIZATION
           "IETF Path Computation Element (PCE) Working Group"
       CONTACT-INFO
           "Email: pce@ietf.org
            WG charter:
                     http://datatracker.ietf.org/wg/pce/charter/"

       DESCRIPTION
         "This MIB module defines a collection of objects for managing
          the Path Computation Element Communication Protocol (PCEP).

          Copyright (c) 2014 IETF Trust and the persons identified as
          authors of the code.  All rights reserved.

          Redistribution and use in source and binary forms, with or
          without modification, is permitted pursuant to, and subject
          to the license terms contained in, the Simplified BSD License
          set forth in Section 4.c of the IETF Trust's Legal Provisions
          Relating to IETF Documents
          (http://trustee.ietf.org/license-info)."

       REVISION
           "201412171200Z" -- 17 December 2014
       DESCRIPTION
           "Initial version, published as RFC 7420."
       ::= { mib-2 227 }

   pcePcepNotifications OBJECT IDENTIFIER ::= { pcePcepMIB 0 }
   pcePcepObjects       OBJECT IDENTIFIER ::= { pcePcepMIB 1 }
   pcePcepConformance   OBJECT IDENTIFIER ::= { pcePcepMIB 2 }

   --
   -- PCEP Entity Objects
   --

   pcePcepXEntityTable OBJECT-TYPE
       SYNTAX      SEQUENCE OF PcePcepXEntityEntry
       MAX-ACCESS  not-accessible
       STATUS      current
       DESCRIPTION
           "This table contains stateful information about local PCEP 
            entities.
            The entries in this table are read-only."
       ::= { pcePcepObjects 5 }

   pcePcepXEntityEntry OBJECT-TYPE
       SYNTAX      PcePcepXEntityEntry
       MAX-ACCESS  not-accessible
       STATUS      current
       DESCRIPTION
           "This entry represents a local PCEP entity."
       AUGMENTS       {  pcePcepEntityEntry  }
       ::= { pcePcepXEntityTable 1 }

   PcePcepXEntityEntry ::= SEQUENCE {
	   pcePcepEntityRedelegationTimer    Unsigned32,
	   pcePcepEntityStateTimeoutTimer    Unsigned32 
   }

   pcePcepEntityRedelegationTimer OBJECT-TYPE
       SYNTAX      Unsigned32 (0..65535)
       UNITS       "seconds"
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
           "On session down with a stateful PCE, this is the time the
           PCC will wait before attempting to redelegate LSPs that were
           delegated to this PCE, to other PCEs. 
           
           In the case of initiated LSPs this is the time the PCC will
           wait for the PCE to come back and resume ownership of the 
           LSPs."
       ::= { pcePcepXEntityEntry 1 }

   pcePcepEntityStateTimeoutTimer OBJECT-TYPE
       SYNTAX      Unsigned32 (1..65535)
       UNITS       "seconds"
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
           "On session down with a stateful PCE, this is the time the
           PCC will wait before taking local ownership of LSPs that were
           delegated to that PCE.
           
           In the case of initiated LSPs, this is time the PCC waits for
           any other backup PCEs to stake claim to the initiated LSPs. 
           After expiration of this timer, any orphan LSPs will be
           flushed."
       ::= { pcePcepXEntityEntry 2 }
       
   --
   -- The PCEP Peer Table
   --

   pcePcepXPeerTable OBJECT-TYPE
       SYNTAX      SEQUENCE OF PcePcepXPeerEntry
       MAX-ACCESS  not-accessible
       STATUS      current
       DESCRIPTION
           "This table augments the pcePcepPeerTable. It includes
           information about stateful messages exchanged between the 
           peers. All fields in the table are read-only."
       ::= { pcePcepObjects 6 }

   pcePcepXPeerEntry OBJECT-TYPE
       SYNTAX      PcePcepXPeerEntry
       MAX-ACCESS  not-accessible
       STATUS      current
       DESCRIPTION
           "Information about a single peer that spans all PCEP
            sessions to that peer. Each row is for a single peer.
            
            This table augments the pcePcepPeerTable. It includes 
            additional information about stateful messages exchanged
            between the peers."
       AUGMENTS { pcePcepPeerEntry }
       ::= { pcePcepXPeerTable 1 }

   PcePcepXPeerEntry ::= SEQUENCE {       
       pcePcepPeerNumPCRptSent             Counter32,
       pcePcepPeerNumPCRptRcvd             Counter32,
       pcePcepPeerNumPCUpdSent             Counter32,
       pcePcepPeerNumPCUpdRcvd             Counter32,
       pcePcepPeerNumPCInitiateSent        Counter32,
       pcePcepPeerNumPCInitiateRcvd        Counter32,
       pcePcepPeerNumPCRptSentDFlag        Counter32,
       pcePcepPeerNumPCRptRcvdDFlag        Counter32,
       pcePcepPeerNumPCRptSentSFlag        Counter32,
       pcePcepPeerNumPCRptRcvdSFlag        Counter32,
       pcePcepPeerNumPCRptSentRFlag        Counter32,
       pcePcepPeerNumPCRptRcvdRFlag        Counter32,
       pcePcepPeerNumPCRptSentCFlag        Counter32,
       pcePcepPeerNumPCRptRcvdCFlag        Counter32,
       pcePcepPeerNumPCUpdSentDFlag        Counter32,
       pcePcepPeerNumPCUpdRcvdDFlag        Counter32,
       pcePcepPeerNumPCUpdSentSFlag        Counter32,
       pcePcepPeerNumPCUpdRcvdSFlag        Counter32,
       pcePcepPeerNumPCInitiateSentCFlag   Counter32,
       pcePcepPeerNumPCInitiateRcvdCFlag   Counter32
       pcePcepPeerNumPCInitiateSentRFlag   Counter32,
       pcePcepPeerNumPCInitiateRcvdRFlag   Counter32
   }
   
   pcePcepPeerNumPCRptSent OBJECT-TYPE
       SYNTAX      Counter32
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
           "The number of PCRpt messages sent to this peer."
       ::= { pcePcepXPeerEntry 1 }

   pcePcepPeerNumPCRptRcvd OBJECT-TYPE
       SYNTAX      Counter32
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
           "The number of PCRpt messages received from this peer."
       ::= { pcePcepXPeerEntry 2 }

   pcePcepPeerNumPCUpdSent OBJECT-TYPE
       SYNTAX      Counter32
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
           "The number of PCUpd messages sent to this peer."
       ::= { pcePcepXPeerEntry 3 }

   pcePcepPeerNumPCUpdRcvd OBJECT-TYPE
       SYNTAX      Counter32
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
           "The number of PCUpd messages received from this peer."
       ::= { pcePcepXPeerEntry 4 }

   pcePcepPeerNumPCInitiateSent OBJECT-TYPE
       SYNTAX      Counter32
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
           "The number of PCInitiate messages sent to this peer."
       ::= { pcePcepXPeerEntry 5 }

   pcePcepPeerNumPCInitiateRcvd OBJECT-TYPE
       SYNTAX      Counter32
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
           "The number of PCInitiate messages received from this peer."
       ::= { pcePcepXPeerEntry 6 }

   pcePcepPeerNumPCRptSentDFlag OBJECT-TYPE
       SYNTAX      Counter32
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
           "The number of PCRpt messages with 'D'(Delegate) flag sent to
           this peer."
       ::= { pcePcepXPeerEntry 7 }
       
   pcePcepPeerNumPCRptRcvdDFlag OBJECT-TYPE
       SYNTAX      Counter32
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
           "The number of PCRpt messages with 'D'(Delegate) flag 
           received from this peer."
       ::= { pcePcepXPeerEntry 8 }
    
   pcePcepPeerNumPCRptSentSFlag OBJECT-TYPE
       SYNTAX      Counter32
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
           "The number of PCRpt messages with 'S'(Sync) flag sent to
           this peer."
       ::= { pcePcepXPeerEntry 9 }
       
   pcePcepPeerNumPCRptRcvdSFlag OBJECT-TYPE
       SYNTAX      Counter32
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
           "The number of PCRpt messages with 'S'(Sync) flag received
           from this peer."
       ::= { pcePcepXPeerEntry 10 }
       
   pcePcepPeerNumPCRptSentRFlag OBJECT-TYPE
       SYNTAX      Counter32
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
           "The number of PCRpt messages with 'R'(Remove) flag sent to
           this peer."
       ::= { pcePcepXPeerEntry 11 }
       
   pcePcepPeerNumPCRptRcvdRFlag OBJECT-TYPE
       SYNTAX      Counter32
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
           "The number of PCRpt messages with 'R'(Remove) flag received
           from this peer."
       ::= { pcePcepXPeerEntry 12 }
       
   pcePcepPeerNumPCRptSentCFlag OBJECT-TYPE
       SYNTAX      Counter32
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
           "The number of PCRpt messages with 'C'(Create) flag sent to
           this peer."
       ::= { pcePcepXPeerEntry 13 }
       
   pcePcepPeerNumPCRptRcvdCFlag OBJECT-TYPE
       SYNTAX      Counter32
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
           "The number of PCRpt messages with 'C'(Create) flag received
           from this peer."
       ::= { pcePcepXPeerEntry 14 }
       
   pcePcepPeerNumPCUpdSentDFlag OBJECT-TYPE
       SYNTAX      Counter32
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
           "The number of PCUpd messages with 'D'(Delegate) flag sent to
           this peer."
       ::= { pcePcepXPeerEntry 15 }
       
   pcePcepPeerNumPCUpdRcvdDFlag OBJECT-TYPE
       SYNTAX      Counter32
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
           "The number of PCUpd messages with 'D'(Delegate) flag 
           received from this peer."
       ::= { pcePcepXPeerEntry 16 }
       
   pcePcepPeerNumPCUpdSentSFlag OBJECT-TYPE
       SYNTAX      Counter32
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
           "The number of PCUpd messages with 'S'(Sync) flag sent to
           this peer."
       ::= { pcePcepXPeerEntry 17 }
       
   pcePcepPeerNumPCUpdRcvdSFlag OBJECT-TYPE
       SYNTAX      Counter32
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
           "The number of PCUpd messages with 'S'(Sync) flag received
           from this peer."
       ::= { pcePcepXPeerEntry 18 }
       
   pcePcepPeerNumPCInitiateSentCFlag OBJECT-TYPE
       SYNTAX      Counter32
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
           "The number of PCInitiate messages with 'C'(Create) flag sent
           to this peer."
       ::= { pcePcepXPeerEntry 19 }
       
   pcePcepPeerNumPCInitiateRcvdCFlag OBJECT-TYPE
       SYNTAX      Counter32
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
           "The number of PCInitiate messages with 'C'(Create) flag 
           received from this peer."
       ::= { pcePcepXPeerEntry 20 }
       
   pcePcepPeerNumPCInitiateSentRFlag OBJECT-TYPE
       SYNTAX      Counter32
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
           "The number of PCInitiate messages with 'R'(Remove) flag sent
           to this peer."
       ::= { pcePcepXPeerEntry 21 }
       
   pcePcepPeerNumPCInitiateRcvdRFlag OBJECT-TYPE
       SYNTAX      Counter32
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
           "The number of PCInitiate messages with 'R'(Remove) flag 
           received from this peer."
       ::= { pcePcepXPeerEntry 22 }
       
   --
   -- The PCEP Sessions Table
   --

   pcePcepXSessTable OBJECT-TYPE
       SYNTAX      SEQUENCE OF PcePcepXSessEntry
       MAX-ACCESS  not-accessible
       STATUS      current
       DESCRIPTION
           "A table of PCEP sessions that involve the local PCEP
            entity.  Each entry in this table represents a single
            session.  The entries in this table are read-only.
            An entry appears in this table when the corresponding PCEP
            session transitions out of idle state.  If the PCEP session
            transitions back into an idle state, then the corresponding
            entry in this table is removed.
            
            This table contains additional information to 
            pcePcepSessTable."
       ::= { pcePcepObjects 7 }

   pcePcepXSessEntry OBJECT-TYPE
       SYNTAX      PcePcepXSessEntry
       MAX-ACCESS  not-accessible
       STATUS      current
       DESCRIPTION
           "This entry represents a single PCEP session in which the
            local PCEP entity participates. This contains stateful 
            information about the sessions.

            This entry exists only if the corresponding PCEP session has
            been initialized by some event, such as manual user
            configuration, auto-discovery of a peer, or an incoming TCP
            connection."
       AUGMENTS { pcePcepSessEntry }
       ::= { pcePcepXSessTable 1 }

   PcePcepXSessEntry ::= SEQUENCE {
       pcePcepSessStateful                 TruthValue,
       pcePcepSessStatefulActive           TruthValue,
       pcePcepSessStatefulInitiate         TruthValue,
       pcePcepSessStatefulSyncAvoidance    TruthValue,
       pcePcepSessStatefulSyncIncremental  TruthValue,
       pcePcepSessStatefulTrigInitialSync  TruthValue,
       pcePcepSessStatefulTrigResync       TruthValue,
       pcePcepSessNumPCRptSent             Counter32,
       pcePcepSessNumPCRptRcvd             Counter32,
       pcePcepSessNumPCUpdSent             Counter32,
       pcePcepSessNumPCUpdRcvd             Counter32,
       pcePcepSessNumPCInitiateSent        Counter32,
       pcePcepSessNumPCInitiateRcvd        Counter32,
       pcePcepSessNumPCRptSentDFlag        Counter32,
       pcePcepSessNumPCRptRcvdDFlag        Counter32,
       pcePcepSessNumPCRptSentSFlag        Counter32,
       pcePcepSessNumPCRptRcvdSFlag        Counter32,
       pcePcepSessNumPCRptSentRFlag        Counter32,
       pcePcepSessNumPCRptRcvdRFlag        Counter32,
       pcePcepSessNumPCRptSentCFlag        Counter32,
       pcePcepSessNumPCRptRcvdCFlag        Counter32,
       pcePcepSessNumPCUpdSentDFlag        Counter32,
       pcePcepSessNumPCUpdRcvdDFlag        Counter32,
       pcePcepSessNumPCUpdSentSFlag        Counter32,
       pcePcepSessNumPCUpdRcvdSFlag        Counter32,
       pcePcepSessNumPCInitiateSentCFlag   Counter32,
       pcePcepSessNumPCInitiateRcvdCFlag   Counter32
       pcePcepSessNumPCInitiateSentRFlag   Counter32,
       pcePcepSessNumPCInitiateRcvdRFlag   Counter32
   }
   
   pcePcepSessStateful OBJECT-TYPE
       SYNTAX      TruthValue
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
           "Whether the session has Stateful capability negotiated with
           peer."
       ::= { pcePcepXSessEntry 1 }
       
   pcePcepSessStatefulActive OBJECT-TYPE
       SYNTAX      TruthValue
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
           "Whether the session has Stateful Active capability 
           negotiated with peer."
       ::= { pcePcepXSessEntry 2 }
       
   pcePcepSessStatefulInitiate OBJECT-TYPE
       SYNTAX      TruthValue
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
           "Whether the session has LSP Initiate capability 
           negotiated with peer."
       ::= { pcePcepXSessEntry 3 }
       
   pcePcepSessStatefulSyncAvoidance OBJECT-TYPE
       SYNTAX      TruthValue
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
           "Whether the session has Sync Avoidance capability 
           negotiated with peer."
       ::= { pcePcepXSessEntry 4 }
       
   pcePcepSessStatefulSyncIncremental OBJECT-TYPE
       SYNTAX      TruthValue
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
           "Whether the session has Incremental Sync capability 
           negotiated with peer."
       ::= { pcePcepXSessEntry 5 }
       
   pcePcepSessStatefulTrigInitialSync OBJECT-TYPE
       SYNTAX      TruthValue
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
           "Whether the session has PCE triggered Initial Sync 
           capability negotiated with peer."
       ::= { pcePcepXSessEntry 6 }
       
   pcePcepSessStatefulTrigResync OBJECT-TYPE
       SYNTAX      TruthValue
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
           "Whether the session has PCE triggered Resync capability 
           negotiated with peer."
       ::= { pcePcepXSessEntry 7 }
       
   pcePcepSessNumPCRptSent OBJECT-TYPE
       SYNTAX      Counter32
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
           "The number of PCRpt messages sent on this session."
       ::= { pcePcepXSessEntry 8 }

   pcePcepSessNumPCRptRcvd OBJECT-TYPE
       SYNTAX      Counter32
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
           "The number of PCRpt messages received on this session."
       ::= { pcePcepXSessEntry 9 }

   pcePcepSessNumPCUpdSent OBJECT-TYPE
       SYNTAX      Counter32
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
           "The number of PCUpd messages sent on this session."
       ::= { pcePcepXSessEntry 10 }

   pcePcepSessNumPCUpdRcvd OBJECT-TYPE
       SYNTAX      Counter32
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
           "The number of PCUpd messages received on this session."
       ::= { pcePcepXSessEntry 11 }

   pcePcepSessNumPCInitiateSent OBJECT-TYPE
       SYNTAX      Counter32
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
           "The number of PCInitiate messages sent on this session."
       ::= { pcePcepXSessEntry 12 }

   pcePcepSessNumPCInitiateRcvd OBJECT-TYPE
       SYNTAX      Counter32
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
           "The number of PCInitiate messages received on this session."
       ::= { pcePcepXSessEntry 13 }

   pcePcepSessNumPCRptSentDFlag OBJECT-TYPE
       SYNTAX      Counter32
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
           "The number of PCRpt messages with 'D'(Delegate) flag sent on
           this session."
       ::= { pcePcepXSessEntry 14 }
       
   pcePcepSessNumPCRptRcvdDFlag OBJECT-TYPE
       SYNTAX      Counter32
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
           "The number of PCRpt messages with 'D'(Delegate) flag 
           received on this session."
       ::= { pcePcepXSessEntry 15 }
    
   pcePcepSessNumPCRptSentSFlag OBJECT-TYPE
       SYNTAX      Counter32
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
           "The number of PCRpt messages with 'S'(Sync) flag sent on
           this session."
       ::= { pcePcepXSessEntry 16 }
       
   pcePcepSessNumPCRptRcvdSFlag OBJECT-TYPE
       SYNTAX      Counter32
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
           "The number of PCRpt messages with 'S'(Sync) flag received
           on this session."
       ::= { pcePcepXSessEntry 17 }
       
   pcePcepSessNumPCRptSentRFlag OBJECT-TYPE
       SYNTAX      Counter32
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
           "The number of PCRpt messages with 'R'(Remove) flag sent on
           this session."
       ::= { pcePcepXSessEntry 18 }
       
   pcePcepSessNumPCRptRcvdRFlag OBJECT-TYPE
       SYNTAX      Counter32
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
           "The number of PCRpt messages with 'R'(Remove) flag received
           on this session."
       ::= { pcePcepXSessEntry 19 }
       
   pcePcepSessNumPCRptSentCFlag OBJECT-TYPE
       SYNTAX      Counter32
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
           "The number of PCRpt messages with 'C'(Create) flag sent on
           this session."
       ::= { pcePcepXSessEntry 20 }
       
   pcePcepSessNumPCRptRcvdCFlag OBJECT-TYPE
       SYNTAX      Counter32
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
           "The number of PCRpt messages with 'C'(Create) flag received
           on this session."
       ::= { pcePcepXSessEntry 21 }
       
   pcePcepSessNumPCUpdSentDFlag OBJECT-TYPE
       SYNTAX      Counter32
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
           "The number of PCUpd messages with 'D'(Delegate) flag sent on
           this session."
       ::= { pcePcepXSessEntry 22 }
       
   pcePcepSessNumPCUpdRcvdDFlag OBJECT-TYPE
       SYNTAX      Counter32
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
           "The number of PCUpd messages with 'D'(Delegate) flag 
           received on this session."
       ::= { pcePcepXSessEntry 23 }
       
   pcePcepSessNumPCUpdSentSFlag OBJECT-TYPE
       SYNTAX      Counter32
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
           "The number of PCUpd messages with 'S'(Sync) flag sent on
           this session."
       ::= { pcePcepXSessEntry 24 }
       
   pcePcepSessNumPCUpdRcvdSFlag OBJECT-TYPE
       SYNTAX      Counter32
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
           "The number of PCUpd messages with 'S'(Sync) flag received
           on this session."
       ::= { pcePcepXSessEntry 25 }
       
   pcePcepSessNumPCInitiateSentCFlag OBJECT-TYPE
       SYNTAX      Counter32
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
           "The number of PCInitiate messages with 'C'(Create) flag sent
           on this session."
       ::= { pcePcepXSessEntry 26 }
       
   pcePcepSessNumPCInitiateRcvdCFlag OBJECT-TYPE
       SYNTAX      Counter32
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
           "The number of PCInitiate messages with 'C'(Create) flag 
           received on this session."
       ::= { pcePcepXSessEntry 27 }    
   
   pcePcepSessNumPCInitiateSentRFlag OBJECT-TYPE
       SYNTAX      Counter32
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
           "The number of PCInitiate messages with 'R'(Remove) flag sent
           on this session."
       ::= { pcePcepXSessEntry 28 }
       
   pcePcepSessNumPCInitiateRcvdRFlag OBJECT-TYPE
       SYNTAX      Counter32
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
           "The number of PCInitiate messages with 'R'(Remove) flag 
           received on this session."
       ::= { pcePcepXSessEntry 29 }    
            

5. Security Considerations

All new objects defined in this document are "read-only". Security considerations from [RFC7420] apply to these objects.

6. IANA Considerations

IANA is requested to make the OID assignment for the MIB module under the appropriate subtree.

7. References

7.1. Normative References

7.2. Informative References

Authors' Addresses