The MPLS WG Archive

[Neetu Gupta <neetug@daewoo.dti.daewoo.co.kr>]

Thanx for the Response:

But, actually the Signaling protocol that we are using is RSVP. We create LSPs initially for
the Class of Services specified in the Service Level Agreements for the Differentiated
Signaling case. Service Level Agreement also specifies what will the Ingress point for the
LSP. Also, all the Edge Routers in the MPLS domain are preconfigured. So the LSPs are created
from the Ingress point to every Edge Router. Now the data packet for the destination outside
the MPLS domain comes, how can we find out which Egress LER will route to the Destination,
because at Ingress point we have label to Egress LER and not the Destination in the Switching
Table

-neetu

Manish R. Shah. wrote:

> Hi !!!
>
> Once the LSP's are created, the ingress router looks for the matching FEC, and attaches
> a label corresponding to that FEC on to the data packet. Further forwarding is done using
> the label switching.
>
> In an MPLS domain the LDP has already taken care of mapping
> FEC's with the incoming and outgoing Labels and efficient distribution of Labels.
>
> Look at the following draft for furthur details.  draft-ietf-mpls-ldp-06.txt
>
> Cheers !!!
>
> Manish R. Shah.
> Senior Software Engineer,
> Future Software Pvt Ltd.
> 480-481, Anna Salai, Nandanam
> Chennai 600035.
> Phone: +91-(44)-433-0550 Xten 294.
>
> -----Original Message-----
> From:   Neetu Gupta [SMTP:neetug@daewoo.dti.daewoo.co.kr]
> Sent:   Tuesday, April 25, 2000 10:28 AM
> To:     mpls@uu.net
> Subject:        Finding the Egress Point in the MPSL Domain for the specific Destination
>
> Hello,
>     Suppose the LSPs are created among the Edge Routers in the MPLS
> Domain with specific class of services. Now the data packet comes at the
> Ingress LER, the IP Header contains the Destination Address and TOS
> byte.
>
> Since there are labels to Egress Router, to which Egress LER the data
> packet will be forwarded that will route to the Destination?
>
> I've heard of the draft that specifies how to treat LSP tunnel end node
> like LSP egress edge as next node for route calculations.
> Please give some reference.
> Neetu