Re: [mpls-linux-general] Label stacking example

[James R. L. <jl...@mi...>]

I haven't implemented all of the command line args in the new "mpls" program
yet.  So for now you will have to use mplsadm2 to do label stacking:

I'm gonna add some more info to your drawing just so I can give you
a complete example:

                <------------------17--------------------
                             <----1170------
  10.0.1.0/24   10.0.2.0/30   10.0.2.4/30   10.0.2.8/30   10.0.3.0/24
   ---------0[R1]1--------0[R2]1--------0[R3]1--------0[R4]1---------
            .1  .1        .2  .5        .6  .9       .10  .1
                             -----1160----->
                -------------------16------------------->
R1
--
mplsadm2 -A -O 0 -o push:gen:16:set:eth1:10.0.2.2
(key 0x2)
ip route 10.0.3.0/24 via 10.0.2.2 spec_nh 0x8847 0x2 advmss 1452

mplsadm2 -A -I gen:17:0
mplsadm2 -L eth1:0

R2
--
mplsadm2 -A -O 0 -o push:gen:1160:set:eth1:10.0.2.6
(key 0x2)
mplsadm2 -A -O 0 -o push:gen:16:fwd:0x2
(key 0x3)
mplsadm2 -A -I gen:16:0 -B -O 0x3
mplsadm2 -L eth0:0

mplsadm2 -A -O 0 -o push:gen:17:set:eth0:10.0.2.1
(key 0x4)
mplsadm2 -A -I gen:1170:0 -i pop:peek
mplsadm2 -A -I gen:17:0 -B -O 0x4
mplsadm2 -L eth1:0

R3
--
mplsadm2 -A -O 0 -o push:gen:16:set:eth1:10.0.2.10
(key 0x2)
mplsadm2 -A -I gen:1160:0 -i pop:peek
mplsadm2 -A -I gen:16:0 -B -O 0x2
mplsadm2 -L eth0:0

mplsadm2 -A -O 0 -o push:gen:1170:set:eth0:10.0.2.5
(key 0x3)
mplsadm2 -A -O 0 -o push:gen:17:fwd:0x3
(key 0x4)
mplsadm2 -A -I gen:17:0 -B -O 0x4
mplsadm2 -L eth1:0

R4
--
mplsadm2 -A -I gen:16:0
mplsadm2 -L eth0:0

mplsadm2 -A -O 0 -o push:gen:17:set:eth0:10.0.2.9
(key 0x2)
ip route 10.0.1.0/24 via 10.0.2.9 spec_nh 0x8847 0x2 advmss 1452

Any questions? ;-)

On Wed, Oct 20, 2004 at 12:32:04PM +0200, Birger T?dtmann wrote:
> 
> 
> Hello,
> 
> I have the following lab network:
> 
>   --[R1]--[R2]--[R3]--[R4]--
> 
> I successfully set up manually an LSP from R1 to R4.  However, I now
> want to set up additional label stacking between R2 and R3 manually(!)
> for demonstrative purposes ("look, this is how label stacking works").  
> 
> Unfortunately I was not able to do this neither with the "mplsadm2" nor
> with the "mpls" command (I prefer to use the latter).  Note that I do
> *not* want to use tunnel interfaces.  Is there a neat way to get it done
> without using IP/tunnel ifs?
> 
> My guesss was to set up appropriate NHLFE entries, like
> 
>   mpls nhlfe add key 0x10 instructions nexthop eth0 push gen 1234
> 
> but all I get is "MPLS: invalid last op PUSH, len = 1(1)", so I'm not
> sure what went wrong here....
> 
> 
> Regards,
> -- 
> Birger T?dtmann
>  Technik der Rechnernetze, Institut f?r Experimentelle Mathematik und Institut 
>  f?r Informatik und Wirtschaftsinformatik, Universit?t Duisburg-Essen, Campus Essen
>  email:bto...@ex... skype:birger.toedtmann pgp:0x6FB166C9
> 
> 
> 
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-- 
James R. Leu
jl...@mi...