Quote:
Originally Posted by Ignitionnet
The small 'bumps' people reported look like traffic being rerouted around a problem.
The massive 'wall' obviously congestion but going by how sudden it was that looks like a reroute into a problem.
Hmm wonder if part of a port-channel or even an entire router / couple of them had issues.
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Agreed.
My guess would be, seeing as the small bump and massive wall happened at the same time, one particular node had a problem and some areas routed one way around it and some areas routed another, with too many going the second way and that path being flooded as a result.
However some people describe problems for a while now, not just that obvious bump yesterday which looks like a one off. Perhaps the latter was them taking something down in order facilitate upgrade works for the former. I wouldn't be at all surprising if something had to be upgraded to add capacity, that it's redundant failover would have less capacity and be even more overloaded when taking on the primary's traffic.