If you have congestion on outgoing interfaces you are most likely
running out of packet buffer space on your switch. Especially campus
class switches have small buffers, 4 MB or so and it can run out during
high bursts and interface congestion. With some switches you could
alleviate problem by rearranging congested interfaces to ports with
seperate buffer pool, but you have to check with your switch vendor or
documentation if your switches have shared or split buffer pools. Or
just replace your switches with ones having deeper buffers.
Tomi
On 29.11.2016 11.06, TJ Trout wrote:
I recently upgraded my core network from 1G to 10G and after the upgrade I
have noticed that my 10G switch during peak traffic (1500mbps, 100,000pps)
seems to be dropping traffic for a split second across all ports and all
vlans. I immediately replaced the switch with a different brand/model and
the problem persists.
Sometimes traffic drops to zero, others it drops to 50%, problem is very
random but seems to occur with much more frequency during high PPS (pushing
high traffic / iperf does not induce problem)
Could this be MTU? I've tried flow control, hard code duplex, stp on/off etc
I'm at a loss any ideas?
TJ Trout
Volt Broadband
