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Re: [CCAMP] [OSPF] Updates to ASON Routing for OSPFv2 Protocols (RFC 5787bis) will Update RFC 5786

Zhangfatai <zhangfatai@huawei.com> Mon, 28 November 2011 03:13 UTC

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Date: Mon, 28 Nov 2011 03:11:25 +0000
From: Zhangfatai <zhangfatai@huawei.com>
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To: Acee Lindem <acee.lindem@ericsson.com>, "ospf@ietf.org List" <ospf@ietf.org>
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Subject: Re: [CCAMP] [OSPF] Updates to ASON Routing for OSPFv2 Protocols (RFC 5787bis) will Update RFC 5786
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Hi all,

Can this relaxation be applicable to all the future OSFPv2 documents ?




Thanks

Fatai

From: ospf-bounces@ietf.org [mailto:ospf-bounces@ietf.org] On Behalf Of Acee Lindem
Sent: 2011年11月28日 9:14
To: ospf@ietf.org List
Cc: ccamp@ietf.org
Subject: [OSPF] Updates to ASON Routing for OSPFv2 Protocols (RFC 5787bis) will Update RFC 5786

Please note that this document relaxes the RFC 5786  restriction that a Node Attribute TLV may only appear in a single OSPF TE LSA. Here is the text:


   In order to support ASON reachability advertisement, the Node

   Attribute TLV defined in [RFC5786] is used to advertise the

   combination of a TE Router ID and its set of associated reachable

   address prefixes. The Node Attribute TLV can contain the following

   sub-TLVs:



      - TE Router ID sub-TLV: Length: 4; Defined in Section 6.2

      - Node IPv4 Local Address sub-TLV: Length: variable; [RFC5786]

      - Node IPv6 Local Address sub-TLV: Length: variable; [RFC5786]



   A router may support multiple transport nodes as discussed in section

   6, and, as a result, may be required to advertise reachability (ASON

   SNPPs) separately for each transport node. As a consequence, it MUST

   be possible for the router to originate more than one TE LSA

   containing the Node Attribute TLV when used for ASON reachability

   advertisement.



   Hence, the Node Attribute TLV [RFC5786] advertisement rules must be

   relaxed for ASON. A Node Attribute TLV MAY appear in more than one TE

   LSA originated by the RC when the RC is advertising reachability

   information for a different transport node identified by the Local TE

   Router Sub-TLV (refer to section 6.1).
Here is a link to the document: http://www.ietf.org/id/draft-ietf-ccamp-rfc5787bis-03.txt

If you have any concerns with this change, please send them to this list with the CCAMP list copied.

Thanks,
Acee

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