Re: when to use a multicast address-family

So MSDP peeres will between
R4 and R5
R3 and R4
R5 and R6

or just R4 and R5
coz i am not running Pim between eBGP links

http://prakashkalsaria.wordpress.com

On Wed, May 26, 2010 at 7:15 PM, Tyson Scott <tscott_at_ipexpert.com> wrote:

> 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: 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
>
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Received on Wed May 26 2010 - 19:19:39 ART