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IP Routing problem after enabling MPLS?

  • From: Garry Glendown <garry@regio.net>
  • Date: Wed, 15 Sep 2004 09:29:56 +0200
  • Resent-Date: Wed, 15 Sep 2004 04:09:16 -0400
  • User-Agent: Mozilla Thunderbird 0.8 (Windows/20040913)

An interesting thing just happened ... :(

I enabled MPLS on several routers, without setting anything specific ... 
(i.e., just added "mpls ip" on some necessary interfaces on the way 
between a dialup router and a PE->CE router). Everything seemed to work 
out fine, and labels being distributed correctly. Anyway, one of our 
uplinks started giving me trouble, with connections/routings as such 
working, but severely degraded performance (telnet to ebay.com e.g. 
would connect, a GET / would take a minute or more with only occasional 
blocks of data transfered) - after disabling MPLS on that router (which 
wasn't really necessary anyway), everything worked fine again ... when I 
re-enable MPLS on its GigE, the delays are there again ... increasing 
the MTU to 1512 doesn't help, either ... (switch backplane is 35/29 
series switches, routers involved in the local ethernet are a 12k and 72 
series w/ GigE PAs)

Any idea?

Tnx, -gg

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