Hi all, I have a question about Section 14.1.1 of draft-ietf-bess-rfc7432bis<https://datatracker.ietf.org/doc/html/draft-ietf-bess-rfc7432bis-13#section-14.1.1>.
The first two para of this section say: <quote> For a given ES, if a remote PE has imported the set of Ethernet A‑D per ES routes from at least one PE, where the "Multihoming redundancy mode" in the ESI Label extended community is set to 1, then that remote PE MUST deduce that the ES is operating in Single-Active redundancy mode. This means that for a given <EVI, BD>, a given MAC address is reachable only via the PE announcing the associated MAC/IP Advertisement route - this PE will also have advertised an Ethernet A-D per EVI route for that <EVI, BD> with an L2-Attr extended community in which the P bit is set. I.e., the Primary DF Elected PE is also responsible for sending known unicast frames to the CE and receiving unicast and BUM frames from it. Similarly, the Backup DF Elected PE will have advertised an Ethernet AD per EVI route for <EVI, BD> with an L2-Attr extended community in which the B bit is set. <end quote> Please consider the following misconfiguration scenario depicted in the embedded diagram below: [cid:[email protected]] In this diagram, PE-4: 1. Should treat MH ES in question as if it were operating in Single-Active redundancy mode – with all the implications 2. At the same time, would receive per-EVI RT-1 for a specific EVI with P bit set in the attached L2-Attr Extended Community at least from PE-3 and PE-4 (and possibly also from PE-1 if it was elected as the DF for the EVI in question) 3. Could receive RT-2 for a specific MAC address from at least PE-3 and PE-4 (and possibly also from PE-1 if it was elected as the DF for the EVI in question). Can you please clarify what is the expected behavior of PE-4 regarding forwarding known unicast traffic for such a MAC address? Your response would be highly appreciated. Regards, and lots of thanks in advance, Sasha 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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