nanog mailing list archives
Re: Assumptions about network designs...
From: Andrey Kostin <ankost () podolsk ru>
Date: Tue, 12 Jul 2022 09:10:33 -0400
This is actually not the case. Cable service in some regional areas was restored as late as on Monday and even in the same geographical area there was a partial connectivity, so it looks less probable that network could be overloaded only in some isolated segments longer than the rest of the network and require manual intervention to fix it. OTOH, overloading network core of such big network should be hardly possible. Possible route "poisoning" could be isolated, so that it doesn't affect the whole network cost to cost. It must be very unlucky coincidence of such event to happen on such big scale. Maybe caused by HW or SW bug. I'm talking just about probabilities of different scenarios and trying to compare them. So far, IMO provided version doesn't look very convincing.
Kind regards, Andrey Kostin sronan () ronan-online com писал(а) 2022-07-11 20:18:
I’m “guessing” based on all the services that were impacted the outage was likely cause by a change that caused a routing change in their multi-service network which overloaded many network devices, and by isolating the source the routes or traffic the rest of the network was able to recover. But just a guess. Shane
Current thread:
- Re: Rogers Outage Canada, (continued)
- Re: Rogers Outage Canada L F (Jul 10)
- Re: Rogers Outage Canada Jon Sands (Jul 11)
- Re: Rogers Outage Canada Shane Ronan (Jul 11)
- Re: Rogers Outage Canada Victor Kuarsingh (Jul 11)
- Re: Rogers Outage Canada Keith Stokes (Jul 11)
- Re: Rogers Outage Canada Jared Mauch (Jul 11)
- Re: Rogers Outage Canada Niels Bakker (Jul 11)
- Re: Rogers Outage Canada Andrey Kostin (Jul 11)
- Assumptions about network designs... Matthew Petach (Jul 11)
- Re: Assumptions about network designs... sronan (Jul 11)
- Re: Assumptions about network designs... Andrey Kostin (Jul 12)
- Re: Rogers Outage Canada L F (Jul 11)
- Re: Rogers Outage Canada L F (Jul 11)
- Re: Rogers Outage Canada Andrew Paolucci via NANOG (Jul 11)
- Re: Rogers Outage Canada Snowmobile2004 (Jul 11)
- Re: Rogers Outage Canada Pete Baldwin - TCC (Jul 08)
- Message not available
- Re: Rogers Outage Canada Clayton Zekelman (Jul 08)
- Re: Rogers Outage Canada Andrew Paolucci via NANOG (Jul 08)
- Message not available
- Re: Rogers Outage Canada Clayton Zekelman (Jul 08)