Subject: [Lsr] Solicit feedback of extending the Application Specific Link Attribute (RFC8919) for distributing Site-Cost for 5G Edge Computing Servers

From: Linda Dunbar <[email-masked]>
Date: Mon, 12 Jul 2021 20:02:14 +0000

LSR WG,

We added IS-IS extension to draft-dunbar-lsr-5g-edge-compute-ospf-ext-04, therefore changed the draft name to draft-dunbar-lsr-5g-edge-compute-ext-00.
https://datatracker.ietf.org/doc/draft-dunbar-lsr-5g-edge-compute/

We would like to get feedback on our proposed IS-IS extension:

The Application-Specific Link Attribute sub-TLV described in [RFC8919] can be used to carry the "Site-Cost" for the App server directly attached to the router.
When carrying the "Site-Cost" sub-sub TLVs, the App specific Link Attribute sub-TLV can be included in TLV 22 (extended IS reachability), 23 (IS Neighbor Attribute), or 25(L2 bundle Member Attribute).
The Site-Cost bit is added to the Standard Applications Bit Mask (SABM).
0 1 2 3 4 5 6 7 ...
+-+-+-+-+-+-+-+-+...
|R|S|F|C| ...
+-+-+-+-+-+-+-+-+...

C-bit: set to specify the Site Cost related sub-sub TLVs  are included in the App-Specific Sub-TLV.

Thank you
Linda Dunbar