Re: [mpls-linux-general] How do you want to use TC with MPLS?

[Steven V. d. B. <ste...@in...>]

Hi Jim,

First of all, the label/exp classification to a diffserv per hop behaviour must be
done in every node (not only the ingress).
Now, about our diffserv approach, what we currently (read as experimental) do is:

* ingress node
    netfilter ==refence to label/exp==> mpls_output ==fixed label/exp mapping to
tc_index ==> Queueing/scheduling
(sorry Jim, we're bypassing all your hard work on getting the labels attached to
routing entries and go direct from iptables classification to mpls_output)
The "direct iptables"-approach  has only been written last week, and is currently
under test.

*core node
    mpls_input==> mpls_output ==fixed label/exp mapping to tc_index ==>
Queueing/scheduling

The mapping from label/exp to tc_index is done in sch_dsmark (a pseudo scheduler
that was originally used to set tc_index based on the dscp field in the
IP-header).
dsmark is however no requirement (you could use u32 classifiers, ....), but it
allows to have a uniform diffserv configuration for a combination of mpls and
'normal' ip traffic.

Hope this helps,
Steven

"James R. Leu" wrote:

> Hello all,
>
> I'm working on testing some of the feature I've added recently, and I just
> realized I have no idea how anyone would use them.  So I'm asking all of you
> how do you want to use the features of TC with MPLS?  Are the feature provided
> by iptables more apt for being used with MPLS?
>
> One way I know people want to use TC and MPLS is with respect to
> DiffServ.   Using the DSCP to determine which LSP (L-LSP) or which EXP/LSP
> (E-LSP) a packet should be sent with, then mapping the LSP or EXP/LSP
> back to a DSCP at egress.  But what about the LSRs?  Don't they need to
> do special queuing?  How does TC accomplish special queing without MPLS?
> How should it work with MPLS?
>
> Thanks,
> Jim
>
> PS Yes Olivier, I'm now starting to catch up with you, soon I'll understand why
> your iptables work is so useful :-)
>
> PPS Please Steven respond and explain how you made your DiffServ stuff work
>
> --
> James R. Leu
> jl...@mi...
>
> _______________________________________________
> mpls-linux-general mailing list
> mpl...@li...
> https://lists.sourceforge.net/lists/listinfo/mpls-linux-general

--
Steven Van den Berghe
ste...@in...
Workgroup Broadband Communication Networks
Department Information Technology
Ghent University - Belgium
Phone:  +32 (0)9 267 35 86 | Fax  :  +32 (0)9 267 35 99
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DiffServ over MPLS for Linux: http://dsmpls.atlantis.rug.ac.be
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