From: Brian Hescock (bhescock@xxxxxxxxx)
Date: Wed Jun 07 2000 - 18:55:16 GMT-3
You could also use a static mroute (ip mroute) to use a specfic path. You
can also use the ip igmp access-group <access-list> command to allow/block
certain groups.
Brian
On Wed, 7 Jun 2000, Brian Hescock wrote:
> 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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