[c-nsp] inter-as multicast

[Arie Vayner (avayner)]

Hi,

Merging PIM domains between different networks is not the best idea
(unless on either side it's a VPN providing services to the other
side...)

In multicast you need to worry about a few points:
- RPF paths to the sources have to follow the right multicast path
- You need to be able to signal which groups you want to join for
- You need to learn the sources (unless using PIM-SSM)

A few relevant references:
http://www.cisco.com/en/US/docs/ios/solutions_docs/ip_multicast/Phase_1/
mcstmsdp.html
http://www.cisco.com/en/US/docs/ios/12_0t/12_0t7/feature/guide/mbgp.html
http://www.cisco.com/en/US/docs/ios/ipmulti/configuration/guide/imc_cfg_
mc_vpn_sup.html

Arie


-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Good One
Sent: Thursday, November 04, 2010 05:34
To: cisco-nsp at puck.nether.net
Subject: [c-nsp] inter-as multicast



We have a BGP inter-as peering with one of our service provider over a
sub-interface of a point to point link. And now we want to run PIM
(between us and service provider) using a different sub-interface over a
same point to point link. Someone told me that PIM is an intra-as
protocol and can't be run between service provider. 
Now the question is .. what if we get a /30 IP-Address (keeping in mind
that /30 belongs to service provider AS and they can see it in their IGP
table) from the upstream provider and run PIM over it and then you can
have a static IGMP join on your own router so that our own AS-IPs can
get the multicast. 
thanks
regardsAndrew 		 	   		  
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