The MPLS-OPS Archive

[Roger Clark Williams <rogerw@nordlink.com>]

To follow up on Javier's good answer, remember that an MPLS-aware switch is 
actually a switch combined with a router. The routing actions allow for a 
network-wide viewpoint, with labels and label switched paths developed for 
end-to-end connection. Label protocols (LDP, TDP, RSVP, MP-BGP) running on 
top of this routing process, develop and distribute labels for all possible 
routes to a destination. Only after the labels are in place does the switch 
actually do its switching. The switch portion, like any switch, has no 
network view. It is only interested in getting packets out the proper port 
as fast as it can.

Roger Williams


>Resent-Date: Mon, 23 Sep 2002 12:37:25 -0400
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>From: fraanro <fraanro@arrakis.es>
>To: "Per Hansen" <perflemming@hansen.mail.dk>
>Cc: <mpls-ops@mplsrc.com>
>Date: Mon, 23 Sep 2002 16:04:05 GMT
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>Subject: Re: [MPLS-OPS]: MPLS over Ethernet issue
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>The IP address is known, because the label either comes from a RSVP
>signalling session with the neighbor or from an LDP session. If it was
>a manually configured LSP, then you would need to configure (depending
>on the box, of course) the next hop mac address to use.
>
>Javier.
>
>----- Mensaje Original -----
>Remitente: "Per Hansen" <perflemming@hansen.mail.dk>
>Fecha: Domingo, Septiembre 22, 2002 12:38 pm
>Asunto: [MPLS-OPS]: MPLS over Ethernet issue
>
> >
> > MPLS over Ethernet: how do an MPLS switch learn next hop Ethernet
> > address in an LSP, where it already know the MPLS label toward the
> > switch.
> >
> > When IP routers forwards an IP packet via Ethernet, the typically
> > learnthe MAC address of next hop via the ARP protokol. Is a
> > similar approach
> > defined in IETF, when an MPLS switch can send an MPLS-ARP request to
> > learn the mapping between MPLS label and Ethernet address ? Or is
> > the IP
> > address always known for a next hop MPLS switch in an LSP, such
> > that an
> > normal IP-ARP request can be sent ?.
> >
> >
> >
> >
> >
> >
> >
> >
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