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multicast on Multi-VRF cofnigured router

Hi,

is multicast is supported on Multi-vrf configured router? As I have two document where they are talking about the Multicast can be run on multi-vrf interface not running MPLS. Other doc is saying you can not run mulicast on interface running MPLS with multi-vrf cofniguration...

http://www.cisco.com/en/US/docs/ios/12_2sb/12_2sba/feature/guide/vrflite.html <--- look at the restriction.

http://www.cisco.com/en/US/technologies/tk648/tk828/tk363/technologies_white_paper0900aecd8012033f.html

Why is it not possible to run the MULTICAST on VRF LITE interface running with MPLS on it?

thanks,

Devang

7 REPLIES
Cisco Employee

Re: multicast on Multi-VRF cofnigured router

Devang,

I am not too sure what that second is referring to. Multicast is certainly supported in a multi-vrf (also know as vrf-lite) context as multicast is VRF aware.

Regards

Harold Ritter
Sr. Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
México móvil: +52 1 55 8312 4915
Cisco México
Paseo de la Reforma 222
Piso 19
Cuauhtémoc, Juárez
Ciudad de México, 06600
México

Re: multicast on Multi-VRF cofnigured router

Hritter,

Thanks for your reply. The issue is will multicast work if we have MPLS between PE-CE link and CE is multi-VRF CE? According to me it will not...

AS well as I am trying to find out an application where we have MPLS running on PE-CE link and CE is multi-VRF interface (Interface facing to PE on CE router is also part of VRF)... any idea?

thanks,

Devang

Cisco Employee

Re: multicast on Multi-VRF cofnigured router

Devang,

Why would you have MPLS on the PE-CE link? This is only required in certain corner cases (Carrier supporting Carrier for instance).

Multicast will work on the CE even if this CE is configured for multi-VRF.

Regards

Harold Ritter
Sr. Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
México móvil: +52 1 55 8312 4915
Cisco México
Paseo de la Reforma 222
Piso 19
Cuauhtémoc, Juárez
Ciudad de México, 06600
México

Re: multicast on Multi-VRF cofnigured router

Hritter,

I trying to understand the same thing from the first link i posted in my first post. In that Cisco doc they are talking about MPLS between PE-CE link and also saying that IP Multicast will not be supported in restriction portion of the document. So there I have big confusion. I know Multicast works in PE-CE with multi-VRF CE but there it is saying IP Multicasting will not be supported when there is MPLS running on link between PE-CE link and CE is multi-vrf interface running VRF on interface facing to PE.

Thanks,

Devang

Community Member

Re: multicast on Multi-VRF cofnigured router

Hi All,

This Cisco document (the first one) suggests that in VRF-Lite, MPLS labels are exchanged between PE and CE. However, most books suggest no labels are exchanged between PE and CE, and no MBGP is required.

Here's an sample of the one I tested recently-

http://sites.google.com/site/amitsciscozone/home/mpls/multi-vrf-or-vrf

Is it important to run LDP/MBGP between PE and CE in VRF-Lite? What advantages you get if you run LDP/MBGP instead of not running one?

Please share your thoughts.

Amit.

Re: multicast on Multi-VRF cofnigured router

Amit,

According to me adding MPLS between PE-CE link with CE acting as Multi-VRF CE (PE facing interface is also in VRF) will not support the Multicast... then you will have to add full mesh of GRE between required sites to support the multicast...

even i am also looking for what are the advantages of running LDP/BGP on PE-CE link... if there is a case for CSC then its fine to have MPLS between PE-CE link but again MultiVRF CE with PE facing VRF interface will have issue with Multicast scalability...

waiting for an replies from different engineers to get clear view of it...

thanks,

Devang

Community Member

Re: multicast on Multi-VRF cofnigured router

Multicast should work in both of the following scenarios:

1. CE doing VRF-Lite with no MPLS between PE-CE (assuming PE is doing MPLS towards core).

2. PE-CE doing MPLS i.e. CsC

Have you lab tested and found that this doesnt work?

IMO both of above should work.

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