RE: Multicast MPLS VPN across CsC

Short answer - yes CSC multicast works on 12.2S

related details -

officially InterAS OptionB, optionC and CSC multicast are not supported on
any code that doesn't have MDT SAFI support.

In regard to CCIE SP (12.2S in year 2009), this is out of my notes -

Issues in 12.2S without Multicast VPN Inter-AS Support -

InterAS topology used for the below explanation -

CE1----PE1-P1-ASBR1(AS1)------------(AS2)ASBR2-P2-PE2----CE2

1. Option A - works
i.) does not require support for inter-AS MDTs. All works fine.

2. Option B Inter-AS - doesn't work

the Source PE address is not shared between ASs
i.) 1st issue: The PE1 connected to CE1 doesn't have its loopback IP address
sent to the other AS. Only the loopback of ASBR1 is sent via eBGP to the
other AS. Hence, P routers on the other AS won't be able to perform
successful RPF check for the PE1's loopback due to absence of routing info.
 ii.) 2nd issue: when PIM join in received from CE1 to PE1, PE1 will do a
route lookup in the VRF routing table for the next-hop destination. This
next-hop destination should be reachable via the MTI tunnel and there should
be PIM neighborship with the next-hop. But since in Option2, the next-hop is
changed by the ASBR to itself, there will be a contradiction and RPF check
will fail on the PE.
 iii.) 3rd issue: In an adjacent autonomous system, a PE router that wants
to join a particular source of the default MDT for a given MVPN must know
the originator's address of the source PE router. This presents some
challenges for Option B inter-AS deployments because the originator next hop
for VPNv4 routes is rewritten. The default MDT for inter-AS MVPN could not
be established coz the P2 routers in other AS don't hold the PE1 routes.

3. Option C Inter-AS - works

i.) In case of a typical deployment where RR contains all VPNv4 routes,
it'll work. No issues. PE1-AS1 to PE2-AS2 MTI PIM neighborship should be up.

4. CSC Hierarchical VPN multicast - works coz it is kind of similar to
Option3 Inter-AS
 Check my blog for CSC multicast sample config (too much config to post
here)-
http://eminent-ccie.blogspot.com/2009/11/csc-hierarchical-mpls-vpn-mvpn-csc.
html

cheers
Swap
#19804

-----Original Message-----
From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of
Service Provider
Sent: Tuesday, November 10, 2009 10:16 AM
To: Rick Mur
Cc: Cisco certification; Cisco certification
Subject: Re: Multicast MPLS VPN across CsC

Does it work with the IOS we are using for the lab exam?

On Sun, Nov 8, 2009 at 12:31 AM, Rick Mur <rmur_at_ipexpert.com> wrote:

> Yes it is possible to get working! When I was preparing for the SP lab I
> did a couple of these scenarios without issues.
>
> Please post your configs and small topology so we can assist you.
>
> --
> Regards,
>
> Rick Mur
> CCIE2 #21946 (R&S / Service Provider)
> Sr. Support Engineer  IPexpert, Inc.
> URL: http://www.IPexpert.com
>
> On 7 nov 2009, at 17:27, Service Provider wrote:
>
> Hi guys
>>
>> I've been trying some weird things with multicast and cannot get it to
>> work
>> with CsC. Anyone had luck with this before?
>>
>>
>> Blogs and organic groups at http://www.ccie.net
>>
>> _______________________________________________________________________
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Blogs and organic groups at http://www.ccie.net
Received on Tue Nov 10 2009 - 12:11:15 ART