Re: [mpls-linux-general] How to measure traffic in the core of a MPLS network

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

Hmm.  This is a good question.

So first I want to point out that are counter stored on each ILM and
NHLFE.  You can get access to these counters via netlink.

So I do not know of a way to directly match the label.  This sounds
like an excellent opportunity for a project if anyone is looking for one.
I can already image ways of doing this. (mplstables anyone?)

I don't think iptables is going to help you at all in this effort
since it only can interact with packets that go into the IPv4
stack.  In the core of the network the packet never leave the MPLS
stack.

TC might be able to help by using its 'match' code which allows you
to specify an offset and a hex-value to match against (pretty tedious).
Once you have a match I think you could apply some "tc actions" to the
packet.  I'm not sure what all actions you can apply, but I think there
is a mechanism for counting packets.

Let me know what you find.

On Mon, Feb 13, 2006 at 10:59:38PM +0000, Guilherme Torres wrote:
> I'm trying to measure the MPLS traffic between two
> LSR's in the core of a MPLS network. How do I do to
> match the label of a MPLS packet in a iptables rule?=20
>=20
> I tryed to use a rule like "iptables -A FORWARD -m mac
> --mac-source 00:A0:C9:73:EF:77 -j ACCEPT" but it
> doesn't count any byte.
>=20
> Best regards
>=20
>=20
> 	=09
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--=20
James R. Leu
jl...@mi...