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[Lsr] Comments on Requested Codepoints for draft-li-lsr-isis-area-proxy

"Les Ginsberg (ginsberg)" <ginsberg@cisco.com> Sat, 20 June 2020 20:07 UTC

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From: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>
To: "draft-li-lsr-isis-area-proxy.authors@ietf.org" <draft-li-lsr-isis-area-proxy.authors@ietf.org>
CC: "lsr@ietf.org" <lsr@ietf.org>
Thread-Topic: Comments on Requested Codepoints for draft-li-lsr-isis-area-proxy
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Date: Sat, 20 Jun 2020 20:07:04 +0000
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Subject: [Lsr] Comments on Requested Codepoints for draft-li-lsr-isis-area-proxy
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(NOTE: Comments below are mine alone - wearing both my WG member hat and my Designated Expert for IS-IS Registries Hat. They do not represent support for or against the draft itself.)



draft-li-lsr-isis-area-proxy-06  currently proposes the use of one new sub-TLV of Router Capabilities TLV and three new top level TLVs



1)Area Proxy Router Capability - sub-TLV of Router Capability TLV



2)Inside Node TLV - Top level TLV



3)Area Proxy TLV - Top Level TLV with optional sub-TLVs:

   Sub-TLV Area Proxy System ID

   Sub-TLV Area Segment SID



4)Area Segment SID - Top Level TLV





Comments:

This seems unnecessarily profligate in its consumption of top level TLV code points - something to which, as a Designated Expert for the IS-IS registries,  I pay close attention.

I can imagine an alternative encoding which utilizes a single sub-TLV within the Router Capabilities TLV:



Area Proxy Router Capability sub-TLV



  Type: TBD

  Length: Variable

  Value: Flags + Optional sub-TLVs



1 octet of Flags:



      0 1 2 3 4 5 6 7

      +-+-+-+-+-+-+-+

      |I|L|P| RSVD  |

      +-+-+-+-+-+-+-+



I If set indicates Inside Node

L If set indicates capable of performing Area Leader functions

P If set indicates Proxy LSP advertisement

RSVD - for future allocation



Followed by optional sub-sub-TLVs



Sub-sub-TLV Area Proxy System ID

Sub-sub-TLV Area SID (Used only when P bit is set)



Please comment on this alternative.



Additional Questions:

It is not clear to me why Area SID requires two different advertisements :

1)As a sub-TLV of Area Proxy TLV and

2)As a top Level TLV in the Proxy LSP

Is it because you wanted a unique codepoint for the Proxy LSP advertisements?



With what I have proposed above, there is only one form of the Area SID advertisement but the indication of Proxy LSP is provided.



****



There is a statement regarding the SR Capabilities sub-TLV advertised by the Area Leader as having:



   "an SRGB identical to that advertised by all Inside Routers"



SR does not require all nodes to advertise identical SRGBs. Are you imposing

a new requirement in order to support SR and Area Proxy together? If so, what happens if all Inside Nodes do NOT advertise identical SRGBs?



   Les

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