Re: [mpls-linux-general] the quesion about traffic balancing

[Pim V. H. <pim...@in...>]

On Tue, 2002-10-08 at 11:33, Folke Aeon wrote:
> hi, all :)
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>    i got a problem in balancing my traffic through
> my network.
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>    see the following network topology:
>       +------+      +------+     +------+   |
>       |      |eth1  |      |     |      |   |10.0.0.0/24
>       |      +------+ CORE +-----+      |   +-------
> eth0 |      |      |      |     |      |   |
> ------+ LSR1 |      +------+     | LSR2 +---+
>       |      |eth2               |      |   |
>       |      +-------------------+      |
>       +------+       LINK0       +------+
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>    all three PCs are running kernel-2.4.19 with a
> mpls patch 1.160.
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>    on lsr1 , i have three ethether net adaptors.
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>      eth0 is the ingress device
>      eth1 has an outgoing label 1
>      eth2 has an outgoing label 2
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>    and two tunnels created by using 'mplsadm -T':
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>      mpls12 : bind to eth2
>      mpls1c : bind to eth1
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>    and its routing table contains the following
> entry:
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>    10.0.0.0/24 dev mpls12 proto kernel
>    core dev mpls1c proto kernel
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>   now , i want to make a flow with a certain
> dst ip address , say , 10.0.0.111, to go throught
> this network by balancing the traffic loading
> onto eth1 and eth2 on demand.
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>   e.g. when the direct link between lsr1 and
> lsr2 (for convenience we named it LINK0 )are
> lighted loaded, the traffic destined to
> 11.0.0.111 goes out using mpls12 with a label 2.
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>   when sometimes later, the loading on LINK0
> became heavier, i want to shift the traffic
> destined to 11.0.0.111 to go out using mpls1c
> with label 1.
Well you need some kind of monitoring to determine the load. This is not
really MPLS specific so you might want to search the net for a tool that
fits your needs. Or you could write something yourself based on the
statistics in /proc/net/mpls_*. Based on the monitoring information you
can map/remap traffic on the different LSPs.=20
Another option would be to use some static load sharing. ip(8) supports
adding multiple interfaces to a single route, the traffic is shared
based on a hash on the IP header. Has anyone experience with that using
MPLS?

Pim.
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>   can i achieve this ?
>   if i can , what should i do then ?
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>   by the way , i am not using LDP currently.
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> thanks in advance.
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> Folke.
>=20
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>=20
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Pim Van Heuven            Ghent University - IMEC
Department  of  Information  Technology   (INTEC)
Sint-Pietersnieuwstraat, 41 B-9000, Gent, Belgium
pim...@in...
        DiffServ/MPLS(RSVP-TE) for Linux:
        http://dsmpls.atlantis.rug.ac.be