Solved: 2 basic questions on multicasting

gautamzone · ‎07-02-2010

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 · ‎07-02-2010

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

View solution in original post

shivlu jain · ‎07-03-2010

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

http://www.mplsvpn.info

View solution in original post

Edison Ortiz · ‎07-03-2010

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

View solution in original post

Edison Ortiz · ‎07-06-2010

Access switches do not need to be modified.

Regards,

Edison

View solution in original post

Edison Ortiz · ‎07-02-2010

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

gautamzone · ‎07-02-2010

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

shivlu jain · ‎07-03-2010

You can use MSDP for RP redundancy.

http://www.cisco.com/en/US/docs/ios/12_2/ip/configuration/guide/1cfmsdp_ps1835_TSD_Products_Configuration_Guide_Chapter.html

regards

Shivlu Jain

http://www.mplsvpn.info

shivlu jain · ‎07-03-2010

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

http://www.mplsvpn.info

Edison Ortiz · ‎07-03-2010

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

gautamzone · ‎07-05-2010

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 · ‎07-06-2010

Access switches do not need to be modified.

Regards,

Edison

Edison Ortiz · ‎07-06-2010

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