RE: when to use a multicast address-family

Typically you are going to be using MSDP and yes no PIM in AS45. Multicast
will be used to carry source information for RPF.

But it can also be used in a single AS when you have multicast traffic
taking a different path than the IPv4 Unicast routing table and you are not
allowed to use static mroutes.

I think the most important thing to remember is that you are going to use it
to fix RPF failures in relation to the R&S Lab exam.

Regards,

Tyson Scott - CCIE #13513 R&S, Security, and SP

Managing Partner / Sr. Instructor - IPexpert, Inc.

Mailto: <mailto:tscott_at_ipexpert.com> tscott_at_ipexpert.com

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From: Prakash Kalsaria [mailto:kalsaria.prakash_at_gmail.com]
Sent: Wednesday, May 26, 2010 9:37 AM
To: Tyson Scott
Cc: Cisco certification
Subject: Re: when to use a multicast address-family

You mean that link is not running pim DENSE mode

or a domain is not running PIM DENSE MODE

R1------R2---------R3--------------------------R4-------------R5------------
---------R6-------R7--------R8

   AS 123 AS 45
AS 678

so it means like AS 123 run Pim dense mode

AS 678 runs pim dense mode

AS 45 does not run Pim Dense Mode

even a link between AS 123 and 45 and link between AS45 ---AS 678 does
not run PIM

and if enable BGP IPv4 & Multicast peers in as 45 and Links between AS123
& 45 and Links between 45 & 678

Will it work

is it that Multicast BGP will carry the Multicast route and RP information
only

and do we need to enable PIM neighborship between domain or over the link,
when you have Multicast BGP configured

On Wed, May 26, 2010 at 5:48 PM, Tyson Scott <tscott_at_ipexpert.com> wrote:

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

Blogs and organic groups at http://www.ccie.net
Received on Wed May 26 2010 - 09:45:27 ART