Reliability of looking glass sites / rviews

Christopher Morrow morrowc.lists at
Wed Sep 13 15:52:22 UTC 2017

On Wed, Sep 13, 2017 at 11:42 AM, Matthew Huff <mhuff at> wrote:

> Both should have been similar.
> In the first case we lost power to all of our BGP border routers that are
> peered with the upstream providers
> In the second case, I did an explicit “shut” on the interface connected to
> the upstream provider that appeared “stuck” after an hour after the outage.

oh, I had thought when you broke the second time intentionally you might
have shut the bgp session (and then maybe the interface too) ... causing a
different semantic for the withdrawals in the isp network.

it's possible that if the load of updates was large enough for the ISP(s)
in question that things simply took a long while to process. In a recent
similar situation we'd observed updates/convergence taking upwards of 30
minutes  to trickle through the global system :(

> From: <christopher.morrow at> on behalf of Christopher Morrow <
> morrowc.lists at>
> Date: Wednesday, September 13, 2017 at 10:58 AM
> To: Matthew Huff <mhuff at>
> Cc: nanog2 <nanog at>
> Subject: Re: Reliability of looking glass sites / rviews
> On Wed, Sep 13, 2017 at 5:30 AM, Matthew Huff <mhuff at<mailto:
> mhuff at>> wrote:
> This weekend our uninterruptible power supply became interruptible and we
> lost all circuits. While I was doing initial debugging of the problem while
> I waited on site power verification, I noticed that there was still paths
> being shown in rviews for the circuit that were down. This was over an hour
> after we went hard down and it took hours before we were back up.
> explicit vs implicit withdrawals causing different handling of the problem
> routes?
> I worked with our providers last night to verify there weren't any hanging
> static routes, etc... We shut the upstream circuit down and watched the
> convergence and saw that eventually all the paths disappeared. Given what
> we saw on Saturday, what would cause route-views to cache the paths that
> long?  Some looking glass sites only show what they are peered with or at
> most what their peers are peered with, that's why I've always used
> route-views.
> What looking glass sites other than route-views would people recommend?
> ripe ris.

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