Hi,
I think you should check out
https://tools.ietf.org/html/draft-ietf-bess-evpn-df-election-framework-09
This draft updates RFC7432 in certain aspects of the DF Election, and it is
already at the RFC editor.
Check out the use of Ethernet Tag in the document.
o Ethernet Tag - used to represent a Broadcast Domain that is
configured on a given ES for the purpose of DF election. Note that
any of the following may be used to represent a Broadcast Domain:
VIDs (including Q-in-Q tags), configured IDs, VNI (VXLAN Network
Identifiers), normalized VID, I-SIDs (Service Instance
Identifiers), etc., as long as the representation of the broadcast
domains is configured consistently across the multi-homed PEs
attached to that ES. The Ethernet Tag value MUST be different from
zero.
Thanks.
Jorge
From: BESS <[email protected]> on behalf of Jaikumar Somasundaram
<[email protected]>
Date: Friday, April 5, 2019 at 6:15 AM
To: "[email protected]" <[email protected]>
Cc: P Muthu Arul Mozhi <[email protected]>
Subject: [bess] DF election rule in EVPN MH, for untagged interface - reg
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>. 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
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