[nsp] Mapping traffic into MPLS tunnels

From: Ravichander Vaidyanathan (vravi@research.telcordia.com)
Date: Wed May 22 2002 - 13:08:48 EDT

Hi,

I am running an MPLS network running IOS 12.2T and am interested in
mapping traffic into explicit MPLS tunnels. As far as I can tell, there
are only two ways of doing this:

            C1-----R1----R2-----R3-----C2

1. Using the "tunnel destination" command, and then "autoroute announce"
to inform the routing process of the tunnel's existence. In the figure,
assume that I have a tunnel between R1 and R3. Then, if I set the tunnel
destination to be R3, all traffic between R1 and R3 would use this tunnel,
right? (assuming that the tunnel metric is the shortest path between R1
and R3).

Also, can I set the tunnel destination to an IP address other than R3? For
instance can I set the tunnel destination to C2, and would this have the
effect of sending all traffic between R1 and C2 via the tunnel?

2. Setting static routes to use the tunnel interface. e.g. "ip route
<dest_addr> <mask> tunnel 10"

Is there any other technique that allows one to have more control over the
traffic that can be mapped into an MPLS tunnel? (Say by specifying an
access list to map the traffic, or by using other IP header fields etc.?)

thanks in advance,
Ravi

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