Re: [mpls-linux-general] Inheriting EXP bit in tunnel cascade

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

On Tue, Aug 17, 2004 at 01:49:06PM +1000, Jon...@cs... wrote:
> Dear James,
> 
> > I think you can convert the EXP bits to tcindex(or nfmark) in 
> > the ILM and then in the NHFLE convert from tcindex(or nfmark) 
> > back to EXP _before_ each push.
> > 
> > Something like this:
> > 
> > mplsadm2 -A -I gen:16:0
> > mplsadm2 -I gen:16:0 -i 
> > exp2tc:0:0:1:1:2:2:3:3:4:4:5:5:6:6:7:7:pop:fwd:0x2
> > 
> > where 0x2 is the key for this NHLFE:
> > 
> > mplsadm2 -A -O 0
> > Key: 0x2
> > mplsadm2 -O 0x2 -o 
> > tc2exp:0x3f:0:0:1:1:2:2:3:3:4:4:5:5:6:6:7:7:push:gen:17:tc2exp
> > :0xf:0:0:1:1:2:2:3:3:4:4:5:5:6:6:7:7:push:gen:18:set:eth1:ipv4:1.1.1.1
> 
> Silly question... Is there any reason why the mask of first tc2exp is
> 0x3f while the second one is 0xf ?

Nope.  It's a typo.  Technically the mask only needs to be 0x7, but 0xf works
just fine.

> > I think your feature request is a valid one.  AS you can see this
> > EXP->tcindex, tcindex->EXP is a pain.  A simple flag on the 
> > NHLFE would make this process much easier.
> 
> I agree... Perhaps it is nice to have this option in a newer version,
> regardless whether it is the best practice or not. 
> 
> Cheers,
> Jonathan
> 
> 
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-- 
James R. Leu
jl...@mi...