The MPLS-OPS Archive

[Mark Gibson <Mark.Gibson@cramer.com>]

I'm attempting to understand how RSVP-TE signalled MPLS-TE tunnels and CoS
on MPLS networks interwork on Cisco gear (at the moment). 

As I understand it, an RSVP-reserved tunnel causes a fair queue to be
created each time a reservation is created, proportional to the size of the
bandwidth signalled and is essentially flow-based (the flow being the
tunnel)

With MPLS-DS I can set up CB-WFQ at each PE and P router for each class. 

My question is this:  If I set up CB-WFQ to include a best-effort class and
then signal an RSVP-TE tunnel, does its reservation get made in the BE chunk
of the CB-WFQ?  Or does it create its own fair queue as before?


In the same vein, without using GB-trunks and configuring sub-pools, how do
I integrate MPLS CoS and TE tunnels?  Can I create a tunnel (with or without
a reservation), create a route map that maps packets on to this tunnel and
assign them an EXP bit with a p-map and have that priority served across the
length of the tunnel?  

It seems theoretically possible to do this from the RFCs, providing that the
reservation made at the RSVP-TE layer is just a control plane reservation. I
note that RFC3564 talks about integrating Class Type and setup/hold priority
in RSVP-TE signalling but I see no reference to an implementation that
supports this.   I'd like to understand how CoS level reservation in an MPLS
network is put into practice. 

Cheers

Mark

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