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Status: Reported (1)

RFC 5515, "Layer 2 Tunneling Protocol (L2TP) Access Line Information Attribute Value Pair (AVP) Extensions", May 2009

Source of RFC: IETF - NON WORKING GROUP
Area Assignment: int

Errata ID: 4620

Status: Reported
Type: Technical

Reported By: Jewgenij Bytschkow
Date Reported: 2016-02-17

Section 4.1. says:

   The following AVPs MUST be present in the CSUN:

      Message Type

      Connect Speed Update (more than one may be present in the CSUN)

   Note that the LAC MUST NOT include a Connect Speed Update AVP for
   which it did not send a Connect Speed Update Enable AVP in the prior
   Incoming-Call-Request (ICRQ) control message for the session.

It should say:

   The following AVPs MUST be present in the CSUN:

      Message Type

      Connect Speed Update (more than one may be present in the CSUN)

   If a CSUN message contains two or more Connect Speed Update AVPs
   (as updates for two or more sessions in the tunnel), the Session ID
   of the L2TP control message MUST be 0.  It is because a CSUN message
   with several Connect Speed Update AVPs is related to several sessions
   in the tunnel, rather than to a single session. 

   Note that the LAC MUST NOT include a Connect Speed Update AVP for
   which it did not send a Connect Speed Update Enable AVP in the prior
   Incoming-Call-Request (ICRQ) control message for the session.

Notes:

The suggested additional MUST requirement is important for LAC-LNS
operation in order to avoid arbitrary, opposite and conflicting
interpretations and implementations of the RFC5515 on LAC and LNS.

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