Re: [bess] some questions about draft-ietf-bess-evpn-igmp-mld-proxy-02 for IGMPv3

[Liuyisong <[e-mail]>]

Hi Mankamana,

     I think more specific description of IGMPv3 for Multicast Join/Leave Synch process should be better added in this draft
     Because IGMPv3 is very complicated, As we know, BLOCK, TO_IN, TO_EX can make some sources leave or even the group fitermode change.
But the route format definition make me confused about how to express TO_IN，TO_EX  by corresponding type 7 or 8 route.
     For example, is there Leave Synch Route(type 8) for the exclude mode source? If so , how can I understand the route?

Thanks
Yisong
    .

From: Mankamana Mishra (mankamis) [mailto:[e-mail]]
Sent: Saturday, October 26, 2019 5:08 AM
To: Liuyisong <[e-mail]>
Subject: Re: [bess] some questions about draft-ietf-bess-evpn-igmp-mld-proxy-02 for IGMPv3

Hey,
Wondering if you still have some question about this draft. I would be present in coming IETF.

From: "Mankamana Mishra (mankamis)" <[e-mail]<mailto:[e-mail]>>
Date: Thursday, July 12, 2018 at 7:14 PM
To: Liuyisong <[e-mail]<mailto:[e-mail]>>, "[e-mail]<mailto:[e-mail]>" <[e-mail]<mailto:[e-mail]>>, "[e-mail]<mailto:[e-mail]>" <[e-mail]<mailto:[e-mail]>>
Cc: Zhuangshunwan <[e-mail]<mailto:[e-mail]>>, "Yangang (Routing Design)" <[e-mail]<mailto:[e-mail]>>
Subject: Re: [bess] some questions about draft-ietf-bess-evpn-igmp-mld-proxy-02 for IGMPv3

Hi Yisong

Would you be present in IETF, we could discuss in person and then update the thread?

Thanks
Mankamana


From: BESS <[e-mail]<mailto:[e-mail]>> on behalf of Liuyisong <[e-mail]<mailto:[e-mail]>>
Date: Thursday, July 12, 2018 at 4:38 AM
To: "[e-mail]<mailto:[e-mail]>" <[e-mail]<mailto:[e-mail]>>, "[e-mail]<mailto:[e-mail]>" <[e-mail]<mailto:[e-mail]>>
Cc: Zhuangshunwan <[e-mail]<mailto:[e-mail]>>, "Yangang (Routing Design)" <[e-mail]<mailto:[e-mail]>>
Subject: [bess] some questions about draft-ietf-bess-evpn-igmp-mld-proxy-02 for IGMPv3

Hi folks,

I have some questions about the draft-ietf-bess-evpn-igmp-mld-proxy-02 for IGMPv3 synchronization

In section 7.2 & 7.3, there are IGMP Join and Leave Synch Route definition as following:
[cid:image003.jpg@01D419FE.B52B2C00][cid:image006.jpg@01D419FE.B52B2C00]

IGMPv3 is very complicated, and it is not very clear to how to construct the IGMP Join/Leave Synch Route in the draft.
Firstly I think only incremental membership information in the IGMP synch route, because the route NLRI can only contain one (S,G) or (*,G)
1.for a simple example:
INCLUDE (A)    BLOCK (B)    INCLUDE (A)             Send Q(G,A*B)
We can use include mode, source A*B, group G in IGMP Leave Synch Routes one by one to notify the other multi-homed PEs.

2.for a more complicated example:
EXCLUDE (X,Y)  TO_EX (A)    EXCLUDE (A-Y,Y*A)       (A-X-Y)=Group Timer
                                                        Delete (X-A)
                                                        Delete (Y-A)
                                                        Send Q(G,A-Y)
                                                        Group Timer=GMI
It is more difficult than example 1.There are 5 actions, and should we use both Join and Leave Synch routes to notify the other multi-homed PEs?
I think we should use:

1） include mode, source A-X-Y, group G in IGMP Join Synch Routes one by one

2） include mode, source X-A, group G in IGMP Join Synch Routes withdraw one by one

3） exclude mode, source Y-A, group G in IGMP Join Synch Routes withdraw one by one

4） include mode, source A-Y, group G in IGMP Leave Synch Routes one by one
Is it appropriate for IGMPv3 Synch route construction in the draft?

3.In IGMPv3, only BLOCK, TO_IN, TO_EX can lead to generate last member query.
Is that mean when the PE only receive BLOCK, TO_IN , TO_EX , it should advertise the leave synch routes to the other multi-homed PEs?


Thanks
Yisong