Solved: How do I collect NP7 packet capture without disabling offload

This article describes how to capture Packets without disabling hw offloading in NP7 devices.

Solution

Step 1: To start packet capture, first NPU filters should be set:

# diagnose npu sniffer filter selector 0
# diagnose npu sniffer filter intf port8
# diagnose npu sniffer filter dir both
# diagnose npu sniffer filter dir 2
# diagnose npu sniffer filter protocol 6
# diagnose npu sniffer filter srcip 193.108.213.15
# diagnose npu sniffer filter selector 1
# diagnose npu sniffer filter intf port8
# diagnose npu sniffer filter dir both
# diagnose npu sniffer filter dir 2
# diagnose npu sniffer filter protocol 6
# diagnose npu sniffer filter dstip 193.108.213.15

Step 2: To capture both incoming and outgoing traffic from 1 IP address, above two filters are defined with same IP as source and destination respectively.

Step 3: After setting filters, it can be verified with below command:

Step 4: With below command packets hitting to the filter are started to be copied to npudbg interface:

# diagnose npu sniffer start

Step 5: After NPU sniffer is started, packets can be captured through npudbg interface with usual ‘# diagnose sniffer packet’ command and usual filters can be used as well:

Step 6: After trace is collected, it is very important to stop npu sniffer with below command:

# diagnose npu sniffer stop

Step 7: In addition, previously set npu filter can be cleared as well:

# diagnose npu sniffer filter clear