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

[<Jon...@cs...>]

Dear James,

> I think you can convert the EXP bits to tcindex(or nfmark) in=20
> the ILM and then in the NHFLE convert from tcindex(or nfmark)=20
> back to EXP _before_ each push.
>=20
> Something like this:
>=20
> mplsadm2 -A -I gen:16:0
> mplsadm2 -I gen:16:0 -i=20
> exp2tc:0:0:1:1:2:2:3:3:4:4:5:5:6:6:7:7:pop:fwd:0x2
>=20
> where 0x2 is the key for this NHLFE:
>=20
> mplsadm2 -A -O 0
> Key: 0x2
> mplsadm2 -O 0x2 -o=20
> 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 ?

> 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=20
> 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.=20

Cheers,
Jonathan