Packet Capture On Nexus 9k

N9K# ethanalyzer local interface inband limit-captured-frames 50

To capture a specific number of packets and stop automatically:

This captures everything the CPU is processing. packet capture on nexus 9k

N9K# ethanalyzer local interface inband

N9K(elam-ins)# reset

Always reset the ELAM after use to free up hardware resources.

| Scenario | Tool to Use | Command Hint | | :--- | :--- | :--- | | | Ethanalyzer | ethanalyzer local interface inband display-filter tcp.port==22 | | BGP/OSPF not peering? | Ethanalyzer | ethanalyzer ... display-filter tcp.port==179 | | Host A cannot talk to Host B | ELAM or SPAN | ELAM is faster for single packet debugging. | | Need full PCAP of transit traffic | SPAN / ERSPAN | Configure monitor session | | Ethanalyzer | ethanalyzer

Ethanalyzer local interface inband . It will not capture transit traffic (traffic passing through the switch from one host to another). For that, you need ELAM or SPAN.

The output will show internal headers, VLAN tags, drops, and forwarding decisions. This is complex output but tells you exactly why a packet was dropped or where it was sent. It will not capture transit traffic (traffic passing