This blog was originally started to better help me understand the technologies in the CCIE R&S blueprint; after completing the R&S track I have decided to transition the blog into a technology blog.

CCIE #29033

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Sunday, May 8, 2011

Quick Notes - Multicast Boundry

In order to ensure AutoRP and the administratively scoped multicast addresses do not leak outside or into your multicast domain you need to filter the following:

224.0.1.40 - The Cisco multicast router AUTO-RP-DISCOVERY address is the destination address for messages from the RP mapping agent to discover candidates
224.0.1.39 - The Cisco multicast router AUTO-RP-ANNOUNCE address is used by RP mapping agents to listen for candidate announcements
239.0.0.0/8 - Administratively Scoped



Create an ACL denying the respective IP's and ranges
access-list 24 deny   224.0.1.39
access-list 24 deny   224.0.1.40
access-list 24 deny   239.0.0.0 0.255.255.255
access-list 24 permit any

Apply to the interface using " ip multicast boundary"
inter fas 0/1
 ip multicast boundary 24

1 comments:

Anonymous said...

A good companion article to this would be something on BSR boundary. BSR is the configuration of choice for the IE SP and is open standards.

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