2 basic questions on multicasting

[gautamzone]

Dear Friends,

A few doubts on implementing multicasting on 6500 switches:
1. Should i configure ip pim auto rp listener on the rp itself?
2. Should i configure ip pim sparse-mode even on the interface connecting to the source of the multicast?


Thanks a lot
Gautam

[Edison Ortiz]

1. Should i configure ip pim auto rp listener on the rp itself?

No, the auto-rp listener is only needed on non-RP mcast routers to find the existence of an auto-rp.

2. Should i configure ip pim sparse-mode even on the interface connecting to the source of the multicast?

If it's a Layer3 interface, yes. If it's a L2 interface (access vlan or trunk port) no.


Regards,
Edison

[shivlu jain]

You can use MSDP for RP redundancy.

http://www.cisco.com/en/US/docs/ios/12_ ... apter.html


regards
Shivlu Jain

[shivlu jain]

The auto-rp listener is used to overcome the need to configured a
sparse-dense-mode, when you actually only need sparse mode, but still to use
auto-RP. The candidate-RP and mapping agent using multicast address
224.0.0.39 & 224.0.0.40 must communicate using dense-mode ie the path from
the candidate-RP to the mapping agent must be sparse-dense-mode or
dense-mode, for the mapping agent to hear the announcements from the
candidate-RP.

When you then configure auto-rp listener, you are essentially telling the
multicast process to use dense-mode communication for multicast address
224.0.0.39 & 224.0.0.40 and sparse-mode for other multicast addresses, with
that you can use sparse mode throughout your network and candidate-RP and
mapping agent will still be able to talk to each other.

regards
Shivlu Jain

[Edison Ortiz]

For RP redundancy, you need to implement Anycast RP
The following white paper gives you a high level overview of its implementation:

http://www.cisco.com/en/US/docs/ios/sol ... ycast.html


Regards,
Edison

[gautamzone]

Thanks a lot.

I believe there are no changes on the access switch as the access switches are 3750 and when i ran sh ip igmp snooping, it mentioned that IGMP snooping was already enabled.
Can you confirm if access switches dont need any other config


Thanks a lot
Gautam

[Edison Ortiz]

Access switches do not need to be modified.


Regards,
Edison

[Edison Ortiz]

For RP redundancy, you need to implement Anycast RP
The following white paper gives you a high level overview of its implementation:

http://www.cisco.com/en/US/docs/ios/sol ... ycast.html


Regards,
Edison