[j-nsp] RSVP-Signalled LSPs

[David Ball]

   Assuming you're not defining 'strict' LSP paths (ie. forcing the
LSP to follow a certain path), it should attempt to re-establish via
an alternative path immediately.  In fact, if you have enabled
fast-reroute (and all points along the LSP support it), it will have
done so in advance, and will have an alternative path immediately
available for the broken segment of the LSP until the LSP can be fully
resignalled end-to-end.

David



On 3/27/07, Dermot Williams <dermot.williams at irishbroadband.ie> wrote:
> Hello all,
>
>
>
> I have a quick question about RSVP LSPs that one or more of you might be
> able to answer for me. According to the JNCIS study guide "when an
> established LSP experiences a failure and is torn down, the traffic that
> was transiting the LSP begins to be forwarded using native IPv4 lookups
> in the network."
>
>
>
> It's unclear from this sentence whether or not the LSP will be rebuilt
> using an alternative path or if the router will forward packets using
> the IGP indefinitely (requiring a manual clear in order to get it
> rebuilt). Our experience is that the LSP will be rebuilt over an
> alternative path fairly quickly but to date we have only used them to
> carry Layer 2 VPNs so that may impact the behaviour.
>
>
>
> Could anyone clarify this for me?
>
>
>
> Dermot Williams
>
>
>
> Senior Network Engineer
>
> Irish Broadband Internet Services
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>
> Mobile:   +353 86 3887961
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