Re: Is there a methodical way to check full reachability?

On Fri, Jan 22, 2010 at 19:22, Joe Astorino <jastorino_at_ipexpert.com> wrote:
> The issue with the /24 loopbacks is that you will actually not have a
> label for the LER in the MPLS cloud. B What will happen is that by
> default OSPF will advertise that /24 loopback as a /32. B LDP on the
> other hand will advertise the /24. B Since your LFIB is based in part
> by your existing routing table, and the label you received does not
> match the prefix in your RIB (/24 vs /32) the label will never be
> installed.

... which is exactly the reason why summarizing Loopback networks in
MPLS networks is a big no-no :-). Well... if you wish to have your
MPLS services actually working.

One thing to note - this will probably NOT affect the "regular"
traffic, however, anything that actually relies on MPLS (VPNs) will
fail miserably. All along you will see the routes in the routing
tables, but stuff will just not work.

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Marko Milivojevic - CCIE #18427
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