Les,
> a)Advertise the “Area Prefix” in the Area Proxy TLV – much as we do a > router-id today in the Router-ID TLV. This would make the Area Prefix mandatory for Area Proxy, which is not desired. We would prefer it to remain optional and thus part of the Area SID sub-TLV. > b)The remaining info (reachability and SID) can then be provided using > existing Prefix Reachability advertisements – no need for new sub-TLV for > “Area SID”. This eliminates any potential issues if the SID advertised by > “Area SID sub-TLV” were to differ from the SID advertised in Prefix > Reachability for the same prefix. As we discussed privately, we view this as a non-issue. The Area Leader is the one advertising both the Area SID sub-TLV and the Proxy LSP. If there’s a coding error, there’s a coding error. There is a single source of truth (the Area Leader’s config) and we cannot protect against every possible coding error. Reconciling the prefix with a separate advertisement has a non-trivial chance of being broken too, and IMHO, much larger. > There then remains the question as to whether the “Area Prefix” is anycast > or unicast i.e., is it common to all IERs or is it unique to whomever gets > elected Area Leader? Does it matter? We have no clear semantics for this prefix. A difference that makes no difference is no difference. Tony
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