CR-LDP supported Platforms

[pavlosd]

Does Cisco support the CR-LDP? If yes, does anyone knows if it is supported on 7600 sup720 3bxl?

[Harold Ritter · Accepted solution]

Cisco does not support CR-LDP. In fact, very few vendors do.

Let me know if I answered your question,

[pavlosd]

Yes, you did. So Cisco does not support a protocol that can do both Label Distribution and Traffic Engineering, Right? The only way is to use RSVP for the Traffic Engineering and LDP for the Laber Distribution?

Are there any plans to include CR-LDP, even in the IOS-XR?

Thanks.

[Harold Ritter]

My understanding is that CR-LDP is pretty much dead. IETF has made a choice in favor of RSVP. Therefore I doubt that Cisco or any other vendor would invest in a protocol that IETF has decided to drop. For more information, please refer to RFC3468.

http://www.ietf.org/rfc/rfc3468.txt?number=3468

Let me know if I answered your question,

[Harold Ritter]

I forgot to answer your first question. Yes, you generally do need LDP for label distribution and RSVP for TE. I say generally bacause you wouldn't necesseraly need LDP if you had a full mesh of TE tunnel between all PEs.

Let me know if I answered your question,

[pavlosd]

Can you give me an example of how this is done? The "no LDP" one? Would MPLS/VPN still work? what about P routers?

[Harold Ritter]

MPLS VPN (or any other MPLS service for that matter) works as long as an LSP is signalled between the ingress and the egress PE. If you have a TE tunnel between the ingress and egress PE then RSVP is used to signal the LSP and there is no need for LDP to be used.

The P routers would obviously require support for MPLS TE in this scenario.

Let me know if I answered your question,

[pavlosd]

Excellent. Thanks.