MPLS LDP & RSVP

Answered Question

Hi all,


In MPLS which of the following must enable to populate the LSP ?

From documentation both are doing the same function.



Which is correct seeting for MPLS network.

1) LDP only

2) RSVP only

3) LDP + RSVP


If TE is configured and full mesh between routers, can disable LDP right?




Regards

Correct Answer by Olivier ARRIGHI about 7 years 4 days ago

Hi


this is not exactly the same function. RSVP is used for TE in this situation.


LSPs can be built by RSVP(in case of TE only) or LDP.(you can run LDP over a TE tunnel though).You cannot use LDP to establish TE tunnels.


1)You can have a LDP only network : no TE tunnels in this case as TE tunnels are using RSVP to exchange labels.

2)You can have a RSVP only network : in this case you have to have full mesh TE tunnels, end to end.In this case you can disable LDP

3)You can have both : some TE tunnels implemented on top of a LDP network.You should care to run LDP over your TE tunnels in cases those tunnels are not end to end


cheers


olivier

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Correct Answer
Olivier ARRIGHI Tue, 05/18/2010 - 10:05
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Hi


this is not exactly the same function. RSVP is used for TE in this situation.


LSPs can be built by RSVP(in case of TE only) or LDP.(you can run LDP over a TE tunnel though).You cannot use LDP to establish TE tunnels.


1)You can have a LDP only network : no TE tunnels in this case as TE tunnels are using RSVP to exchange labels.

2)You can have a RSVP only network : in this case you have to have full mesh TE tunnels, end to end.In this case you can disable LDP

3)You can have both : some TE tunnels implemented on top of a LDP network.You should care to run LDP over your TE tunnels in cases those tunnels are not end to end


cheers


olivier

smadhams Wed, 08/10/2011 - 18:37
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Can someone tell me whether LDP Over RSVP supported on cisco devices, if so can you please give me the configuration. (Tunnel shourcuts)

Shivlu Jain Wed, 08/10/2011 - 18:47
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  • Bronze, 100 points or more

I would like to add one more point


You can enable full mest te tunnels in the core and use ldp in the access and distribution network.

The advantage of using it, it actually helps to save the cpu resources rather mixing ldp and te both.


Regards

Shivlu Jain

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