WS-24-400A - High number of TX Pause frames

[leejohnston]

Hi all,

Hoping someone might be able to shed some light on this for me. We have a WS-24-400A (running 1.4.5) connected uplinked to a Cisco 3750G switch, with flow control enabled on the port. However I'm seeing a relatively high number of Tx Pause frames from the WISP Switch. There's not a huge amount of traffic hitting the switch - about 150Mbps with around 16kpps. Does this suggest that the traffic coming in is filling the packet buffer on the WISP switch?

Screenshot below:



I'm not sure if it's worth disabling flow control, but I've been guessing that it's better at least passing the pause frames back to the Cisco instead of silently dropping packets on the WISP switch.

Thanks,
Lee.

[sirhc]

Traffic entering the switch on port 1 destined to another port, say with a wireless AP or wireless PTP link, is more packets than the switch can send out that port so that ports buffers fill so the switch sends a Tx Pause frame out port 1 receiving packets to the port that can not take as much data as the router is sending it.