Cogent input

From: Justin Shore (no email)
Date: Thu Jun 11 2009 - 09:46:45 EDT

  • Next message: Paul Stewart: "RE: Cogent input"

    I'm in search of some information about Cogent, it's past, present and
    future. I've heard bits and pieces about Cogent's past over the years
    but by no means have I actively been keeping up.

    I'm aware of some (regular?) depeering issues. The NANOG archives have
    given me some additional insight into that (recurring?) problem. The
    reasoning behind the depeering events is a bit fuzzy though. I would be
    interested in people's opinion on whether or not they should be consider
    for upstream service based on this particular issue. Are there any
    reasonable mitigation measures available to Cogent downstreams if
    (when?) Cogent were to be depeered again? My understanding is that at
    least on previous depeering occasion, the depeering partner simply
    null-routed all prefixes being received via Cogent, creating a blackhole
    essentially. I also recall reading that this meant that prefixes being
    advertised and received by the depeering partner from other peers would
    still end up in the blackhole. The only solution I would see to this
    problem would be to shut down the BGP session with Cogent and rely on a
    2nd upstream. Are there any other possible steps for mitigation in a
    depeering event?

    I also know that their bandwidth is extremely cheap. This of course
    creates an issue for technical folks when trying to justify other
    upstream options that cost significantly more but also don't have a
    damaging history of getting depeered.

    Does Cogent still have an issue with depeering? Are there any
    reasonable mitigation measures or should a downstream customer do any
    thing in particular to ready themselves for a depeering event? Does
    their low cost outweigh the risks? What are the specific risks?


  • Next message: Paul Stewart: "RE: Cogent input"

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