As RFC 2328 says, forwarding addresses can be repeated in
AS-external-LSAs for backward-compatibilty with previous
versions of the OSPF specification. In those old versions, separate
data could be given for differing Type of Service values, allowing you to
say for example "low delay traffic goes to this address, and high
bandwidth traffic goes to this other address".

Note that some implementations encode proprietary information
as non-zero Type of Service data. You should only look at the
forwarding address, metric type and cost associated with Type of
Service 0, which always comes first.

John

-----Original Message-----
From: sdf sdaf [mailto:kannan_ind01YAHOO.COM]
Sent: Sunday, July 29, 2001 3:41 AM
To: OSPFDISCUSS.MICROSOFT.COM
Subject: About ASExternal LSA

Hi,
  As far as RFC 2328 is concerned I believe that one
ASExternal LSA is for one calculation,That is one LSA
has to go through all the condidtion in section
16.4(ASExternal route calculation)I don't know whether
the ASExternal LSAs have links in their LSAs or pieces
like the router LSAs which has Link to their neighbor.
    If I am wrong,correct me and dotellme how to
perform ASexternal calculation whenI have one Type 5
LSA.
Also tell me why the forwarding address etc are
repeating in the structure /format of type 5 lsa in
the appendix of RFC2328.
thanx & regards,
Kannan

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