IPv4 mutlicast routing over GRE

[romainpage]

Hi,

Can someone tell me if PIM routing over GRE tunnel is officially supported on 45xx models (4500E or 4500X) ?

In "feature search", I can only find 6K and 7K supporting this feature...

Thanks.

Best regards,

Romain

[Peter Paluch]

Hi Romain,

Regarding plain Catalyst 4500, the GRE and multicast over GRE seems to be supported in software - this might be a problem depending on the volume of the multicast traffic to be carried across the GRE tunnel:

http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst4500/12-2/54sg/configuration/guide/config/mcastmls.html#wp1082100

With Catalyst 4500E, the sparse information I was able to find out suggests that the GRE itself is supported - again in software - and I would suppose that the multicast over GRE would be available in the similar way as on 4500 series.

The Catalyst 4500-X appears to support GRE in hardware which should also include running multicast over the GRE tunnel:

http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst4500/release/note/ol-37xe-4500x.html

Every information should be considered as my best effort - unfortunately, I do not have first hand experience with these platforms and I cannot guarantee that these conclusions are correct. I have, however, tried my best.

Best regards,
Peter

[romainpage]

Thanks for this answear, it was what I had found too but there is no clear validation of PIM over GRE support (even if the support of each feature independantly should imply global support).

I was worried because in feature navigator (http://tools.cisco.com/ITDIT/CFN/jsp/by-feature-technology.jsp), "IPv4 multicast over pt to pt GRE" does not show 45xx series.

Best regards,

Romain