Subject: [bess] Comments on "draft-sajassi-bess-evpn-igmp-mld-proxy-00"

From: Haoweiguo <[email-masked]>
Date: Thu, 22 Oct 2015 09:17:35 +0000

Hi Ali,

I have read through the draft, i think the procedures is fine for IGMP/MLD proxy. However, this draft doesn't consider multicast router scenario, better to be added.

Scenario 1:

         An EVPN PE acts as multicast router and runs PIM protocol with the outside multicast routers.

Scenario 2:

         An EVPN PE connects to a multicast router on port1, no IGMP receiver on the port.  The PE sends IGMP/MLD to the multicast router.

In both scenarios, the EVPN PE should announce its role through the extended route type6 to indicate it connects to a multicast router or acts as multicast router itself.

Other EVPN PEs having local multicast source should forward the multicast traffic to the PE announcing multicast router role, the PE announcing multicast router role should not be pruned for all multicast traffic.

For the PE connecting to a multicast router, it should translate  EVPN route type-6 message to IGMP/MLD message, it's already described in your draft. For the PE acting as multicast router, it should translate EVPN route type-6 message to PIM protocol, this part has not been covered in your draft, better to be added.

Thanks,

weiguo