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Posted by stephen on April 22, 2006, 10:19 am
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>
> Hi !
>
> The scenerio is Like this :
>
> I am on my laptop which is connected with the Access Switch 2950,
> The access switch is connected with the Distribution 3550 Switch and
> 3550 Distribution is connected with the Core Switch.
>
> There are multiple VLANs and other locations are also connected in the
> same way with this Core swithc.I am trying for the multicasting audio
> /streaming.
>
> CORE(config)#interface vlan 22
> CORE(config-if)#ip pim version 2
> CORE(config-if)#ip pim dense-mode
> CORE(config-if)#ip cgmp
>
>
> CORE(config)#ip multicast-routing
> CORE(config)#interface vlan 99
> CORE(config-if)#ip pim version 2
> CORE(config-if)#ip pim dense-mode
> CORE(config-if)#ip cgmp
>
> Access Switch is L2 switch and didnt use any command for multicasting.
>
> I configured the following command on the Core Switch and installed a
> application for audio streaming LIVE CASTER.
> when i select the audio file and assign the IP address on the user of
> VLAN 22, the LIVE Caster starts the playing file but on the user of
> VLAN 22 there is no respone.
> I have debug ip cgmp , but didnt see any thing .
>
> Where can be the problem? Where I need to make the changes ?
the problem here is that you dont have enough info to understand where
things are going wrong - so you need to do some testing to sort that out.
get it working locally within a single VLAN 1st. (if it doesnt the
application / pc / server / IP stack is broken so no point going on).
then try it with the devices connected directly to a single layer 3 switch -
use PIM v2 - i prefer sparse mode to make sure periodic flooding doesnt
cause problems..
check that the layer 3 switch is getting the group registrations and that
traffic is flowing in the hardware switching path - this is turned off by
default on a Catalyst 6500 running in IOS mode
once it works on a single L3 switch you can add more switches and make sure
the topology discovery and so on is working.
i would not use cgmp either (since it is cisco proprietary, and i havent
seen a good enough description to let me hunt a problem with a sniffer) - if
you must have layer 2 switches limiting where the streams go then maybe IGMP
snooping is better.
Finlly if you campus has vlans that cross a lot of trunks, remember that you
might get a copy of each stream in each vlan if there are recievers in each.
>
--
Regards
stephen_hope@xyzworld.com - replace xyz with ntl
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