07-02-2010 04:33 PM - edited 03-06-2019 11:53 AM
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
Solved! Go to Solution.
07-02-2010 05:22 PM
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
07-03-2010 01:26 AM
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.
07-03-2010 09:02 AM
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/solutions_docs/ip_multicast/White_papers/anycast.html
Regards,
Edison
07-06-2010 08:03 AM
07-02-2010 05:22 PM
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
07-02-2010 05:29 PM
Thanks a lot Edison. I am also looking at redundancy
for RP for the same multicast group.
Do you have any link that i can read through to have a redundant RP.
Basically, i am configuring core 1 as RP and i want to have core 2 as redundant RP.
Thanks a lot
Gautam
07-03-2010 01:25 AM
You can use MSDP for RP redundancy.
regards
Shivlu Jain
07-03-2010 01:26 AM
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.
07-03-2010 09:02 AM
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/solutions_docs/ip_multicast/White_papers/anycast.html
Regards,
Edison
07-05-2010 09:28 PM
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
07-06-2010 08:03 AM
Access switches do not need to be modified.
Regards,
Edison
07-06-2010 08:02 AM
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/solutions_docs/ip_multicast/White_papers/anycast.html
Regards,
Edison
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