Hi,
I would like to find out how a phantom queue can be configured in Cisco. A definition of it from [1] is presented here:
"A phantom queue is a simulated queue, associated with each switch egress port, that sets ECN [40] marks based on link utilization rather than queue occupancy. The PQ simulates queue buildup for a virtual egress link of a configurable speed, slower than the actual physical link (e.g., running atγ=95% of the line rate).The PQ is not really a queue since it does not store packets.It is simply a counter that is updated while packets exit the link at line rate to determine the queuing that would have been present on the slower virtual link. It then marks ECN for packets that pass through it when the counter (simulated queue) is above a fixed threshold."
In [1], it is said that Cisco Nexus 5548P Switch supports it but I couldn't find how.
Thanks in advance.
[1] Alizadeh, Mohammad, et al. "Less is more: trading a little bandwidth for ultra-low latency in the data center." Presented as part of the 9th {USENIX} Symposium on Networked Systems Design and Implementation ({NSDI} 12). 2012.
