All things related to multicast

[Amel Caldwell <>]

Alan--

I modified our inbound spoofing filters to deny ip any 239.255.0.0 0.0.255.255
before permitting the local subnet traffic out.  I don't know the
ramifications on CGMP on this approach though.

Amel

On Thu, 2 Oct 2003, Alan Crosswell wrote:

>I want to define site-local as the same as link-local to constrain all
>the hokey SSDP and other 239.255/16 traffic on my campus.  Can anyone
>suggest the "right" way to do this?  I've tried blocking registers to
>the RP with "ip pim accept-register" which results in a syslog for each
>register attempt that is ignored, causing a lot of clutter.
>
>I've also tried "ip igmp access-group" on the individual router
>interfaces since I really don't want to know about these groups.
>However, this has wierd CGMP ramifications it seems:  membership reports
>seem to cause the switch to get a CGMP join for the GDA.  v2 leaves
>however do not cause a CGMP leave to make it to the switch, so the
>static cam entry hangs aroud forever.
>
>/a
>
>