Re: [trill] Query on rbridgeSnoopingPortEntry in draft-ietf-trill-rbridge-mib

Anil R <> Fri, 12 October 2012 14:23 UTC

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Date: Fri, 12 Oct 2012 10:23:49 -0400
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To: wenyu zou <>
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Subject: Re: [trill] Query on rbridgeSnoopingPortEntry in draft-ietf-trill-rbridge-mib
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Hi Wenyu,

The purpose of rbridgeSnoopingPortTable is only to show which RBridge ports have at least one multicast router connected, and hence need to be included in forwarding of multicast packets. Exactly how many multicast routers are there on a port is not important for this table. The purpose is not to give a list of multicast routers, but a list of ports on which at least one multicast router has been detected. You need only one multicast router on a port, for that port to be included in the list of ports where IP multicast is forwarded. Hence, the value of the IP address in this table can be any one of the routers that has been detected on that port.

This is not a IP Multicast snooping MIB, so you will not have all IP Multicast snooping information included in this group. You will get only the multicast snooping information relevant to the operation of a TRILL switch/RBridge.


On Oct 8, 2012, at 8:52 AM, wenyu zou wrote:

> Hi Authors,
>    I have a questions about rbridgeSnoopingPortEntry in
> draft-ietf-trill-rbridge-mib, which is indexed by rbridgeBasePort. For
> one port, it maybe have many Multicast Routers in different VLANs. The
> current structure of rbridgeSnoopingPortEntry set a limitation that
> there is only one Multicast Router for one port. Why don't
> rbridgeSnoopingPortEntry indexed by rbridgeVlanIndex like
> rbridgeSnoopingAddrEntry?
> Thanks.
> Regards,
> wenyu
> _______________________________________________
> trill mailing list