[bess] About draft-brissette-bess-evpn-mh-pa-02

"Rabadan, Jorge (Nokia - US/Mountain View)" <jorge.rabadan@nokia.com> Mon, 05 November 2018 09:44 UTC

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From: "Rabadan, Jorge (Nokia - US/Mountain View)" <jorge.rabadan@nokia.com>
To: "draft-brissette-bess-evpn-mh-pa.authors@ietf.org" <draft-brissette-bess-evpn-mh-pa.authors@ietf.org>, "bess@ietf.org" <bess@ietf.org>
Thread-Topic: About draft-brissette-bess-evpn-mh-pa-02
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Date: Mon, 5 Nov 2018 09:44:50 +0000
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Subject: [bess] About draft-brissette-bess-evpn-mh-pa-02
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Hi all,

I think I already made similar comments when the first revision of the draft in the subject was presented, but since I see no changes in the last revision, please let me throw the comments to the list for discussion:

1) section 3
"Peering PEs MAY exchange only Ethernet-Segment route (Route Type-4)"
Note that the AD per-ES route is REQUIRED in RFC7432. Please don't make this solution non-backwards compatible. Besides, mass withdrawal is important in this solution.

2) section 4
The document only talks about the default Alg and HRW Alg, but other Algs such as Preference make a lot of sense here too.
Also, shouldn't you request a new capability in the DF Election EC capability registry? If so, IMO this could be done:
- the ES routes are advertised with existing DF Algs, e.g., default, HRW, Pref
- when the new capability "port-based" is signaled, the Alg should be modified to consider the port only and not the Ethernet Tags.
- the "port-based" capability should be compatible with the 'DP' capability (for non-revertive) and you should make sure that the AC-DF bit is zero so that an AC going down does not influence the DF Election.

3) I assume the ES associated to the port is defined as single-active mode. Also, as in RFC7432, the ESI-label based split-horizon procedures should be used to avoid transient echo'ed packets.

4) section 5 - Port-active over Integrated Routing-Bridging Interface
In this section you assume that the entire port belongs to a single BD, and there are no other ACs in the BD. Without this assumption you cannot drive the IRB state out of the ES state. Please let me know if I am missing something, otherwise please, make this explicit.

Thank you.
Jorge