On Tue, Jul 02, 2013 at 06:48:14AM +0200, Mikael Abrahamsson wrote: > On Tue, 2 Jul 2013, Juliusz Chroboczek wrote: > > >Anybody seen anything similar? > > I don't know if this is the cause, but older gear from Extreme > Networks (their end-of-90ties and beginning of 2000s), will do ICMP > in slow-path when routing (even packets going through the device) and > "everything else" in fast-path. This could cause latency spikes and > PDV approximately similar to what's seen in the picture.
This looks like a plausible explanation, thanks. They may not be the only router make to exhibit this behaviour. Is there a reason for this slow-path routing of ICMP? I've seen routers applying some kind of rate-limiting to ICMP packets, but as far as I know, it's only limited to ICMP packets originating from the router.
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