[bess] Re: Port-Based Service Interface in draft-ietf-bess-rfc7432bis

["Jorge Rabadan (Nokia)" <[e-mail]>]

Hi Sasha,

The implementations I know, all the traffic – tagged and untagged – is mapped to the EVPN broadcast domain, for that type of service. Since no pop/push is done of the vlan tags, untagged traffic would be encapsulated into the EVPN packet and forwarded as is. My interpretation in this case of “The MPLS-encapsulated frames MUST remain tagged with the originating VID” is no-tagging for those packets, since the originating VID was non-existent.

I don’t see any issues with LACP and multihoming, since LACP PDUs are punted to the control plane on the PEs, and not forwarded.

Thanks.
Jorge

From: Alexander Vainshtein <[e-mail]>
Date: Tuesday, June 18, 2024 at 5:54 AM
To: [e-mail] <[e-mail]>
Cc: [e-mail] <[e-mail]>
Subject: Port-Based Service Interface in draft-ietf-bess-rfc7432bis

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Hi,
I have a question regarding Section 6.2.1 of 7432bis<https://datatracker.ietf.org/doc/html/draft-ietf-bess-rfc7432bis-09#section-6.2.1>.

This section defines Port-based Service Interface in EVPN as “a special case of the VLAN bundle service interface, where all of the VLANs on the port are part of the same service and map to the same bundle” . It further states that “The procedures are identical to those described in Section 6.2” which, in its turn, says that “no VID translation is allowed for this (VLAN bundle - Sasha) service interface type”.

My question is: what happens with untagged traffic received from an Ethernet port to which an EVI (or EVPN-VPWS) implementing port-based service interface is attached?
It seems that mapping untagged traffic to tagged using port-based VLAN ID at ingress and stripping this VLAN tag at egress is not compliant with the definitions above.

An interesting special case could be the case of an All-Active MH ES that runs LACP on its constituent links vs. the attached CE.

Your feedback would be highly appreciated.

Regards, and lots of thanks in advance,
Sasha



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