[bess] DF election rule in EVPN MH, for untagged interface - reg

Jaikumar Somasundaram <jaikumar.somasundaram@ericsson.com> Fri, 05 April 2019 04:15 UTC

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From: Jaikumar Somasundaram <jaikumar.somasundaram@ericsson.com>
To: "bess@ietf.org" <bess@ietf.org>
CC: P Muthu Arul Mozhi <p.muthu.arul.mozhi@ericsson.com>
Thread-Topic: DF election rule in EVPN MH, for untagged interface - reg
Thread-Index: AdTrY6EuJPnF3xFwSHyjWaalOphwjA==
Date: Fri, 5 Apr 2019 04:15:31 +0000
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Subject: [bess] DF election rule in EVPN MH, for untagged interface - reg
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Hi All,

RFC7432, section 8.5, talks about DF election algorithm (service carving algorithm)

only for <ES, VLAN> for VLAN-based service or <ES, VLAN bundle> for VLAN-(aware)
bundle service.

But there wont be any vlan id for untagged interface and so I wonder
how the service carving algorithm can be applied to elect the DF.
Also, should I use the lower VLAN ID even in the case of VLAN-bundle
service, for electing the DF?

Could some one help me to understand this please?

==========<snip from RFC 7432, section 8.5>===============
8.5<https://tools.ietf.org/html/rfc7432#section-8.5>.5>.  Designated Forwarder Election

...

   The default procedure for DF election at the granularity of <ES,

   VLAN> for VLAN-based service or <ES, VLAN bundle> for VLAN-(aware)

   bundle service is referred to as "service carving".
...

      Assuming a redundancy group of N PE nodes, for VLAN-based service,

      the PE with ordinal i is the DF for an <ES, VLAN V> when (V mod N)

      = i.  In the case of VLAN-(aware) bundle service, then the

      numerically lowest VLAN value in that bundle on that ES MUST be

      used in the modulo function.
...
=========<snip end>======================================

Thanks & Regards
Jaikumar S