Alex:

  You didn't clear my doubt yet :-)
  I do understand the wordings but I am asking (rather
  proposing) a change.

-> What confuses me here is: "all" in the above sentence.
-> If I have some numbered links in an area "A" and all
-> unnumbered links in an area "B" then should area "B"'s
-> Router LSA have Router Address?
-> Even if not, will summary LSAs of area "A" will take
-> care of the issue?

  Let us consider a ABR connected to area A, B and C:
  1. all links connected to Area A are unnumbered.
  2. some of the links connected to Area B are unnumbered.
  3. none of the links connected to Area C are unnumbered.

  (Let us assume that a link can be either numbered or unnumbered
   but not both. Let us forget that a link can be both numbered and
   unnumbered - at least in theory)

  Now there are some virtual links configured in Area A or B
  (in case of Area C there won't be any problem)

  The possible solution could be:

  1. advertise Router Address (or any valid IP address reachable
     or routable in the system) in Router LSAs IF it is ABR AND
     a virtual link is configured AND *at least* one unnumbered
     link is in that area.

  2. We can even go little bit ahead and change the semantics.
     OSPF Router ID is a Routable Address in the topology under
     consideration. Unlike just a 32 bit number.

  This way we can get some IP address for virtual links. Don't you
  think so? I think John can answer this well based on his initial
  design :-)

--Venkata Naidu

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