[c-nsp] Multicast state behavior differences between 7600 and ASR9k

[Manu Chao]

Just add the * option in your show mrib route ios-xr command to see the
shared tree entries

You may see a difference between show mrib route * and show mfib route *
table.

R/

On Fri, Feb 25, 2011 at 12:40 AM, John Neiberger <jneiberger at gmail.com>wrote:

> We're seeing a little weirdness that we're having trouble deciphering.
> We have a multicast source connected to a 7600 and we're using SSM. If
> the source starts sending, an mroute entry is created in the mroute
> table immediately, whether or not anything is joining the group. So,
> prior to anything actually joining the group, we can see which groups
> that source is sending to simply by doing a "show ip mroute".
>
> The behavior is different on the ASR9k. On that platform, there are no
> entries in the mrib when the source is sending. The mrib entries are
> not created until something joins the group. Once the receiver leaves
> the group, the mrib entries disappear. This is not expected behavior
> and we've had a few people from Cisco say that multicast state should
> be created if the source is sending, whether or not anything is
> joining.
>
> Do any of you have any idea why this behavior is different on the ASR?
>
> Thanks!
> John
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