From: Deepak Ahuja (deeps.ccie@gmail.com)
Date: Tue Sep 02 2008 - 05:34:44 ART
2nd Try
On Mon, Sep 1, 2008 at 2:36 PM, Deepak Ahuja <deeps.ccie@gmail.com> wrote:
> Hi Experts
>
> I am sure someone will be able to answer my question.
>
> The question
> How can I make one of the interface advertise all the labels in MPLS ?
> Given the situation its a loopback interface.
>
>
>
> Mpls ldp advertise-label interface loopback is not supported, though I can
> type the command but it rejects it with the following error
> "% Loopback interface is not supported"
>
> Per the IETF documentation (
> http://tools.ietf.org/html/draft-swallow-mpls-lsr-self-test-00#section-2)
> The Loopback FEC type is defined to enable an upstream neighbor to
> assist in the LSR self-testing at very low cost. This FEC allows the
> loopback to occur in the dataplane without control plane involvement beyond
> the initial LDP exchange and dataplane setup.
>
> An LSR uses the Loopback FEC to selectively advertise loopback labels to
> its neighbor LSRs. Each loopback label is bound to a particular interface.
> For multiaccess links, one label per neighbor is required since the
> link-level address is derived from the label lookup. When an MPLS packet
> with its top label set to a loopback label is received from an interface
> over which that label was advertised, the loopback label is popped and the
> packet is sent on the interface to which the loopback label was bound.
>
> Thanks in Advance
>
> Warm Regards
>
> Deepak Ahuja
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