North American Network Operators Group

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Not sure what I'm seeing... (Looking Glass Query)

  • From: Aaron Mahler
  • Date: Fri Mar 29 01:04:13 2002


Hope nobody minds a quick question from a small, non-transit but BGP aware AS...

Since the day we started using multiple circuits and BGP I've always seen multiple paths through each of our providers to our network (AS 19138). At least a few C&W (3561) and at least a few Network Virginia (7066) via Sprint...

For weeks or more now, every single looking glass save one shows - for the most part - a single advertised path through C&W. No sign of Sprint & Network Virginia. Even the Sprint looking glass shows no sign of a Sprint path to us.

The one exception is which shows about 50... almost all of which are C&W.

If I pull down the C&W circuit, things shift and Sprint starts showing up with multiple paths in all the looking glasses but will remain that way after the C&W circuit comes back online until I bring down the Sprint circuit. It seems to be one or the other... but never both.

Is this not a big deal and I'm misreading the situation, or has something changed for the worse somewhere in our advertising and relationship with our providers? I can't seem to track down a cause. I've certainly made no changes to my BGP tables and announcements upstream.

For anyone interested in glancing at their routes for me, check and AS 19138.

- Aaron Mahler
Sweet Briar College

P.S. Feel free to yell at me if this post shouldn't be here. I've been lurking for ages and enjoy following the discussions of the very knowledgeable crew out there. Not sure what other forum to ask such a question at this point...