[c-nsp] WRR between LSP's

[Oliver Boehmer (oboehmer)]

Padmavathi Chilukoori <> wrote on Monday, November 19, 2007 1:16 PM:

> Hi Oli,
> 
> We have a scenario as below;
> 
>                                 (LSR)
> ( LER) [ A ]---------[ B ]======[ C ] (LER)
>                             |
>                             |
>                           [ D ]
>                                ( LER )
> 
> Following are the 2 signalled LSP's,
> 
> LSP1: A---B---C : with X bandwidth.
> LSP2: D---B---C : with Y bandwidth.
> 
> These two LSP's are sharing the same link between LSR [B] and LER
> [c], Now, 
> 
> 1:  We want to gaurantee LSP1 with X bandwidth, and LSP2 with Y
>      bandwidth. At LSR [B] how this bandwidths are gauranteed?  Is
> there any scheduler applied for this, if  so, how? what exactly "
> reservation " of bandwidth means?
> 
> 2:  If LSP1 is not utilizing its X bandwidth, then we want LSP2 to
> get that bandwidth utilized.
> 
> How to implement these in Cisco Router & what are the features
> required? 

Ah, now I understand. Well, RSVP TE is a pure signalling protocol. We
will perform admission control based on reserved bandwidth, but we will
not enforce the BW reservation using any Per-Hop Behaviour (i.e. no
queues will actually be programmed). This is still a DiffServ QoS
architecture, so you will need to work with regular MPLS QoS with
EXP-bits and see how you can implement this on the intermediate hops. 

	oli