[mpls-linux-general] Some questions

[Javier L. <jml...@gm...>]

First of all, I'm working with mpls-1.950 on fc4 and I think these
things aren't working well.
I don't know if they work on newer releases.

1.
I can add instructions to labelspace 0, but I can't to others:
[root@localhost ~]# mpls ilm add label gen 100 labelspace 0
instructions forward 0x2
[root@localhost ~]# mpls ilm add label gen 100 labelspace 2
instructions forward 0x2
RTNETLINK answers: No such process

2.
I have a problem when I try to add a label to a packet that already
carries one (only one).
In the LSR, I do:
mpls nhlfe add key 0 instructions push gen 2000 nexthop eth0 ipv4 10.6.44.6
mpls ilm add label gen 1000 instructions forward 0x2

And in the ingress LER I do:
mpls nhlfe change key 0x2 instructions push gen 500 push gen 1000
nexthop eth0 ipv4 10.6.44.2
or:
mpls nhlfe change key 0x2 instructions push gen 1000 nexthop eth0 ipv4 10.6.44.2

In the first case, there isn't any problems, but in the second, the S
bit in the MPLS header
with the label 2000 is set to 1. And it must be 0.
I know that I can pop the label 1000 and push it again, solving the
problem; but if I want
to merge some LSP in that tunnel, I have to repeat the nhlfe line for each LSP.
And I think it isn't the desired behaviour.

3.
I don't know how to use
set-rx-if <NAME> forward <KEY>
I tried this:
[root@localhost ~]# mpls ilm add label gen 255 instructions set-rx-if
eth0 forward 0x2
RTNETLINK answers: Operation not permitted

Thank you.
-- 
Javier Lorenzo