Hi,
We have some QFX5100-48S-6Q and EX4300-48T switches, on which we've
observed tail drops / outbound discards in our monitoring.
As a result we plan to re-partition the buffer allocation, assigning the
maximum space to the best-effort class as described here:
https://www.juniper.net/documentation/us/en/software/junos/traffic-mgmt-qfx/topics/example/cos-shared-buffer-allocation-lossy-ucast-qfx-series-configuring.html
I am curious about the statement that "traffic stops on /all/ ports
until buffer reprogramming is complete." Does anyone have any
real-world experience of making this kind of change? What kind of
interruption to packet forwarding should we expect (we're just changing
the allocation for the existing default classes - not adding any new
ones.) Also we have these configured in a virtual-chassis of 2 x
QFX5100 and 6 x ES4300, any idea on what behaviour to expect in that
circumstance?
Best regards,
Cathal.
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