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MPLS/BGP routing question

  • From: Curtis Villamizar <curtis@workhorse.fictitious.org>
  • Date: Fri, 29 Sep 2000 11:34:01 -0400
  • cc: "'Javier Antich'" <javier.antich@telindus.es>, Michel Redondo Ferrero <mredondo@idecnet.com>, mpls@UU.NET


In message <2AD266216F4FD41192FC00508BD9378E270140@CYPHER.onfiber.com>, Chris F
lores writes:
> Why would you turn off BGP on the core routers?

On an optical switch why would you turn it on?

> What if MPLS breaks or fails for any reason (i.e. software bug). Then, how
> would routing occur?

It wouldn't.  If your optical switches fail, then you can't IP forward
through the control path.

If you can get similar reliability out of the PSC LSPs so that after
failure restoral occurs, even if restoral results in degraded
performance, then you have the same situation in which if the LSP can
be restore, then traffic flow, if it can't be restored, no traffic
flows.  HINT:  Overbooking is a good thing.  CAC is a bad idea.

What happens now if you have a bug in your IGP code or BGP code and
you end up with a persistent routing loop - You can't get there from
here.  If your MPLS code doesn't work or is badly configured (CAC
results in an LSP not coming up at all) expect sililar results.

Curtis