Routing

Setting up NG-MVPN.  We currently have it working with RSVP provider-tunnels.  We are also using RSVP LSPs for unicast traffic, but are thinking about moving to an LDP over RSVP architecture.  Does anyone know if mLDP can be tunneled through RSVP LSPs?

 

Supported in 12.3 and above

I see support for MLDP link protection using dynamic RSVP LSPs, but I don't see anything about support for mLDP over RSVP (ldp-tunneling).  Am I missing something?

It's supported, I saw it working and also got confirmation from Engineering. 12.3+

Just to avoid confusion, this support is for ldp-tunneling on one-hop RSVP LSPs only.

Thanks for your response.

 

Would you happen to have a working configuration?  Or is it just "ldp-tunneling" configured on the RSVP LSP that egresses PE connected to the receiver?

 

Hi!

ldp-tunneling over one-hop RSVP LSPs works as follows. Imagine two neighboring core routers, R1 and R2. R1 can be a PE (ingress or egress) or a P, it doesn't really matter. And the same for R2.

R1 and R2 are IGP neighbors, interconnected via ge-0/0/0.0. And there is an alternative multihop path to go from one to another.

R1# set protocols rsvp interface all link-protection
R1# set protocols ldp p2mp
R1# set protocols ldp interface all
R1# set protocols mpls label-switched-path ONE-HOP-R2 to <R2-LOOPBACK>
R1# set protocols mpls label-switched-path ONE-HOP-R2 ldp-tunneling
R1# set protocols mpls label-switched-path ONE-HOP-R2 link-protection
R1# set protocols mpls label-switched-path ONE-HOP-R2 primary DIRECT-R2
R1# set protocols path DIRECT-R2 <R2-GE-0> strict

AND THE SYMMETRICAL CONFIG IN R2. This creates a targeted LDP session between R1 and R2, and the forwarding path is protected by the RSVP LSP.

The link-protection is only needed if you want fast restoration. Otherwise you can live without it.

Please accept as solution and kudos if it helps 🙂</R2-GE-0></R2-LOOPBACK>