From: Brian Hescock (bhescock@xxxxxxxxx)
Date: Wed Jun 07 2000 - 18:47:17 GMT-3
Muthu,
Good question, I've been looking through "Developing IP Multicast
Networks, Volume 1", by Beau Williamson (CCIE #1346) and haven't found the
answer. In case anyone is interested, the ISBN # is 1-57870-077-9.
The multicast path is influenced by the unicast routing table. You can
alter the path by altering the best path to the destination
network. Another way, if using sparse mode, is to define a different
rendevous point (rp) for the specific multicast group you're interested
in. You would have to adjust the settings so it doesn't fail over to the
shortest path tree after the first packet, which is the default. The
shortest path tree is the best path from the unicast routing table.
With regards to dense mode, two routers on a common segment that are both
trying to forward the same mcast group will go into assert mode. The one
with the better metric will win and the other router will prune the
traffic. If the costs are equal, the router with the higher ip address
will win. You could then modify which one would win by either adjusting
the metrics or making a specific router have the higher ip address.
As far as doing this from within a Cat 5K, I'm not sure it can be
done. You can put in a static cam entry for the multicast layer two
address to point out a certain interface but that isn't what you're trying
to achieve because the mcast stream would still go out the other intended
interfaces. Of course, if you turn off pim on those other router
interfaces... ;-)
Brian
On 7 Jun 2000, MUTHU K wrote:
> Hi Guys,
>
> Right now I am reading and practising on Multicast routing. I am wondering is
> there a way by which we can make a particular router the preffered one for a
> given multicast group on Catalyst 5K
>
>
> Thanks in advance
>
> Muthu
>
>
>
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