Hi Weiguo, Section 10 of RFC 7432 covers this topic nicely. As Jorge alluded to, whether a PE only sends a single Route-Type-2 or two of them, depends on whether the MAC learning is done in control-plane/management-plane or it is done in data-plane. If it is the former, then only a single Route-Type-2 is sent and if it is the latter, then two are sent.
Cheers, Ali From: "Rabadan, Jorge (Jorge)" <[email protected]<mailto:[email protected]>> Date: Saturday, November 21, 2015 at 9:01 AM To: Haoweiguo <[email protected]<mailto:[email protected]>>, Cisco Employee <[email protected]<mailto:[email protected]>> Cc: "[email protected]<mailto:[email protected]>" <[email protected]<mailto:[email protected]>> Subject: Re: [bess] One question about Route-type2 usage in EVPN base protocol Hi Weiguo, I would recommend you to check out the L2VPN archives... we discussed this at length. For instance: http://www.ietf.org/mail-archive/web/l2vpn/current/msg04519.html But check the other emails in the thread. Sending one or two routes, really depend on how the learning is done. Hope it helps. Thanks. Jorge From: BESS <[email protected]<mailto:[email protected]>> on behalf of Haoweiguo <[email protected]<mailto:[email protected]>> Date: Thursday, November 19, 2015 at 1:37 AM To: "[email protected]<mailto:[email protected]>" <[email protected]<mailto:[email protected]>> Cc: "[email protected]<mailto:[email protected]>" <[email protected]<mailto:[email protected]>> Subject: [bess] One question about Route-type2 usage in EVPN base protocol Hi Co-authors, Through ARP process, each EVPN PE can learn local connecting CE's MAC and IP correspondence, and will notify the MAC and IP association to all remote PEs through Route-type2 message. Theoretically, each remote PE can rely on the single route-type2 message to populate local Mac VRF(MAC table) , ARP Cache and IP VRF(IP routing table) at the same time. However, some vendor doesn't do in this way. In its implementation, each PE will notify two route-type2 message to remote PEs, one message(say message 1) only carry MAC information(IP field is invalid), another message(say message 2) carry MAC and IP association information. The remote PEs rely on message 1 to populate local MAC VRF, and rely on message 2 to populate local ARP Cache and IP VRF. I think EVPN protocol should give a clear suggestion for route type-2 message usage, what's the scenario to announce only one message and what's scenario to announce two messages? Thanks, weiguo
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