How to prove the frames break?

I have a pair of Cisco Nexus 5596 switches connected to a Dell Compellent SAN. I'm trying to prove that the SAN sends frames to break from the MAC (flow control) to the Nexus. The Nexus shows the counter "RxPause" incrementing for each interface that is connected to the San. However, the technical support of Dell Compellent representative does not see "TxPause" on the SAN incrementing counter.

In other words: the Nexus says it receives frames break, but said SAN is not send them. It is a direct fiber connection, so one of the two devices is lying. I'm sure it's the SAN, but I need more evidence to show.

I tried a capture of traffic using the commands "the monitor session", but later learned that break mac frames will not be transmitted during a SPAN session like that because receiver interface intercepts and manages them until they can be transmitted.

My question is this: How can I prove beyond a doubt that I get these frames break? Ideally, I would like to have this in a PCAP file because I know people of Dell support will believe they can see in Wireshark. If not, what can I do?

Thank you!

Nick

PAUSE frames are consumed at the ASIC level interface and was never sent to the CPU. He will not be captured by SPAN or ethanalyzer.

The counters of pause frames Rx is conclusive evidence that the switch receives breaks. Not sure if its possible for you to install a faucet on the fiber to capture these images, but even once, this will delay just resolution of the actual issue.

-Raj

Tags: Cisco DataCenter

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