Suvani-

The format of an Opaque-LSA is indicated by its Opaque
Type field. RFC 2370 says that usage of Opaque Types 0-127
must be registered with IANA
(http://www.iana.org/assignments/ospf-opaque-types).
(128-255 are for experimental use and shouldn't be used in a real
product or you might collide with someone else's experiment). I
expect that the registered Opaque Types will be mostly TLV encoded,
but they don't have to be. Certainly Opaque Type 1s (TE LSAs)
are, and in the next version of draft-ietf-ospf-hitless-restart-00.txt
I am going to make Opaque Type 3s (grace-LSAs) TLV-encoded
also.

John

-----Original Message-----
From: Suvani Kaura [mailto:bg24096YAHOO.COM]
Sent: Monday, July 09, 2001 1:47 PM
To: OSPFDISCUSS.MICROSOFT.COM
Subject: Application of Opaque LSAs

Hi Everyone,

Could someone point to the way Opaque LSAs are used in real life,
besides being used for Traffic Engineering? Specifically, I am trying
to figure out how the opaque information in the Opaque LSA is used.

For non-TE LSAs, are there implementations out there that use plain
unstructured data as opaque data, or is any sort of structure (like
TLVs) imposed on the opaque data?

RFC 2370 leaves it upto the applications that use the Opaque LSA, I
guess, but I couldnt find any information on how these LSAs are being
used. Any input would be much appreciated.

TIA,
Suvani.

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