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Cisco Bug: CSCvi13304 - Nexus (T+):Create feature to drop PFC traffic and drop all PAUSE frames

Last Modified

Aug 19, 2019

Products (1)

  • Cisco Nexus 3000 Series Switches

Known Affected Releases

SMU_BUILD_9

Description (partial)

Symptom:
NA

Conditions:
This was the original request submitted by customer. Customer has agreed that we could implement a global command applying to CoS 3 and 4 to make it more simple. 

"As we roll out Verlaine/RDMA widely, we need to provide our network engineers a convenient tool to quickly turn off all RDMA traffic in a switch/cluster if necessary. This tool needs to work even if the end hosts generating/sinking traffic themselves are inaccessible. Think of it as a ?big red switch? that DRIs can press in an emergency, and all RDMA traffic will be dropped. 

The most convenient way to do this is to forcefully turn on PFC watchdog on a specified interfaces for a specified priority, and turn it off when done. So, our ask is to provide CLI commands for this purpose. 

Something like:

Interface Ethernet2/1 Pfc watchdog forced on priority 3
Interface Ethernet 2/1 Pfc watchdog forced off priority 3

When ?on? is called, watchdog will activate on specified interfaces for specified priority. Forced on requires a corresponding forced off ? until then watchdog remains active. When watchdog is turned off, it resumes whatever behavior is specified in the configuration. 

It would also be good to provide global options:

Pfc watchdog forced on priority 3
Pfc watchdog forced off priority 3

This will apply to all interfaces. 

Even better:

Pfc watchdog forced on
Pfc watchdog forced off

This will apply to all interfaces and all priorities.
"
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