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

[Acee Lindem <[e-mail]>]

Hi Fatai,
We have two separate requirements here. The ASON requirement is to be able to advertise reachability information for multiple ASON transport nodes. As you've noted, there has been an independent requirement to advertise more information than will fit in a single LSA. Our draft only addresses the first. However, we'll consider this when addressing Adrian's comments. Much of this depends on whether or not we do a second review and WG last call. 
Thanks,
Acee

On Nov 27, 2011, at 10:11 PM, Zhangfatai wrote:

> Hi all,
>  
> Can this relaxation be applicable to all the future OSFPv2 documents ?
>  
>  
>  
>  
> Thanks
>  
> Fatai
>  
> From: [e-mail] [mailto:[e-mail]] On Behalf Of Acee Lindem
> Sent: 2011年11月28日 9:14
> To: [e-mail] List
> Cc: [e-mail]
> 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
>