RE: when to use a multicast address-family

The multicast address-family is used to build the PIM data distribution
trees. It announced how to reach the multicast source rather than the
typical unicast destination. It is used as a source table for RPF checks.
A separate RIB and FIB is built for this table so it can differ from the
IPv4 Unicast Table. So the short answer is yes to your question basically.
It does provide multicast support across a domain that doesn't run have PIM
between neighbors.

Typically you will use it for RPF checks.

Regards,
 
Tyson Scott - CCIE #13513 R&S, Security, and SP
Managing Partner / Sr. Instructor - IPexpert, Inc.
Mailto: tscott_at_ipexpert.com
Telephone: +1.810.326.1444, ext. 208

-----Original Message-----
From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of
Prakash Kalsaria
Sent: Wednesday, May 26, 2010 3:12 AM
To: Cisco certification
Subject: when to use a multicast address-family

When do its neccessary to enable muilticast address-familly and to form a
mBGP peer ????

when there is a BGP domain in between which supports only a unicast domain
functionality

say ,

AS100 ---------- AS200 --------- AS300

MDT will not form across a network that does not have multicast enabled

so is it ,

when AS 200 does not supports multicast

or the link between AS100 and AS200 dose not run multicast

or both

little confused

http://prakashkalsaria.wordpress.com

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Received on Wed May 26 2010 - 08:18:04 ART