Re: [mpls-linux-devel] Nexthop eth ip

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

On Tue, Apr 19, 2005 at 08:48:50AM +0200, jul...@aq... wrote:
> Hi,
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> When you add a route
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> ip route ********* nexthop eth0 10.0.2.1
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> you indicate the ip of the nexhop so that we can get the mac adresse.
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> the ip of the nexthop is newer used ?
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> is it possible to indicate only the mac adresse ?

Are you refering to the case where you are adding a route that points
to an NHLFE?

    ip route add 1.1.1.0/24 via 10.0.2.1 spec_nh 0x8847 0x2

You are correct that the nexthop ip is never using by MPLS, but it is used
by IPv4.  IPv4 needs to know what interface this traffic will leave
so that locally originated traffic can choose an appropriate source address.
You could also specify just the outgoing interface:

    ip route add 1.1.1.0/24 dev eth1 spec_nh 0x8847 0x2

But you will still need to have an IP address attached to eth1.  This
is a requirement of IPv4, not MPLS.

>=20
>=20
> Thanks,
>=20
>=20
>=20
>=20
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> --=20
> Julien CAYSSOL
> INSA de LYON                  -=3D-      D?partement Telecom Services et =
Usages
> http://www.aqwz.com/                                    T?l : +33 664 973=
 067
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>=20
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--=20
James R. Leu
jl...@mi...