Re: [mpls-linux-general] Examples for nffwd command

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

On Fri, Jun 03, 2005 at 10:55:36AM +0200, Bertrand Lemaitre wrote:
> Hi,
>=20
> Is it possible to have an example for the use of the nffws instruction ?
> Moreover, can you send an example for a stack of two labels with a tunnel=
 ?

Here is an example that creates a label stack by utilizing a tunnel interfa=
ce.
The tunnel NHLFE always pushed label 10000, then based on the NF mark
assigned by iptables, it will push either 21000 or 20000.

mpls nhlfe add key 0 instructions push gen 20000 nexthop eth0 ipv4 192.168.=
2.1
(creates key 0x2)
mpls nhlfe add key 0 instructions push gen 21000 nexthop eth0 ipv4 192.168.=
2.1
(creates key 0x3)
mpls nhlfe add key 0 instructions push gen 10000 nffwd 0x2 0x0 0x2 0x1 0x2 =
0x2 0x3 0x3 0x3
(creates key 0x4)
mpls tunnel add dev mpls0 key 0x4
ip addr add 10.0.0.1/24 dev mpls0
ip route add 1.1.1.1/32 via 10.0.0.2
ip route add 2.2.2.2/32 via 10.0.0.2
ip route add 3.3.3.3/32 via 10.0.0.2
iptables -t mangle -I OUTPUT -d 1.1.1.1/32 -j MARK --set-mark 1
iptables -t mangle -I OUTPUT -d 2.2.2.2/32 -j MARK --set-mark 2

Traffic going to:
- 1.1.1.1 gets label stack 10000:20000
- 2.2.2.2 gets label stack 10000:21000
- 3.3.3.3 gets label stack 10000:20000

I hope this helps!

>=20
> Thanks !
>=20
> Bertrand Lemaitre
>=20
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--=20
James R. Leu
jl...@mi...