Hi Nitsan, Thanks for noticing! Indeed this has come up and the dataplane answer may work, but we considered also updating both drafts to maybe resolve also in CP. The biggest problem is the AC-ID extended community uses a 4-byte field for values that never exceed 3 bytes (VLAN+VLAN) – we needed to consider changing one or both of these drafts to effectively ‘fit’ a 3-byte FRR label and 3-byte ACID into a same extcomm so we can have both information correlated in same ExtCom
I can share details with you offline Regards, Luc André Luc André Burdet | lbur...@cisco.com<mailto:lbur...@cisco.com> | Tel: +1 613 254 4814 From: Nitsan Dolev <nitsan.do...@rbbn.com> Date: Thursday, April 24, 2025 at 19:18 To: Luc Andre Burdet (lburdet) <lbur...@cisco.com>, Patrice Brissette (pbrisset) <pbris...@cisco.com>, ta-miyas...@kddi.com <ta-miyas...@kddi.com>, jorge.raba...@nokia.com <jorge.raba...@nokia.com>, liuyis...@chinamobile.com <liuyis...@chinamobile.com>, linchangwang.04...@h3c.com <linchangwang.04...@h3c.com> Cc: bess@ietf.org <bess@ietf.org> Subject: draft-burdet-bess-evpn-fast-reroute-09 and AC-Aware Bundle service interface support Dear draft-burdet-bess-evpn-fast-reroute-09 co-authors, Your clarification for the following question will be most appreciated, Examination of the EVPN FRR procedures described in current draft raise the following question with regards to the ERL advertiser PE behavior in case of AC Aware bundle service. When a multihomed PE receives an ERL labeled packet from another multihomed ES mate PE, how does it know to which of the ACs (Port/VLAN) shall it send the received packet? As per draft-ietf-bess-evpn-ac-aware-bundling-04 section 4.2.1 the MAC lookup on the MH Mate PE that received that packet from Remote PE with ESL must provide an outgoing port along with the VLAN value. To clarify this use case we may want to explicitly require that the MH PE that performs the FRR procedure MUST make sure that the packet is VLAN tagged before adding the ERL label and send to the Mate PE. This enables the PE that receives the ERL labeled packet to select the right AC (port/VLAN) to send the rerouted packet. Looking forward to getting your answer, Regards, Nitsan Dolev - Ribbon Communication Disclaimer This e-mail together with any attachments may contain information of Ribbon Communications Inc. and its Affiliates that is confidential and/or proprietary for the sole use of the intended recipient. Any review, disclosure, reliance or distribution by others or forwarding without express permission is strictly prohibited. If you are not the intended recipient, please notify the sender immediately and then delete all copies, including any attachments.
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