Information About Dataplane Packet Logging
While onboarding wireless clients, you might encounter problems arising from client IP address allocation, Address Resolution Protocol (ARP) resolution, and so on, which require debugging. For rapid debugging of such issues on the controller, the Dynamic Host Configuration Protocol (DHCP), Neighbor Discovery, and ARP packets that go to and from the wireless clients are unconditionally logged.
Packet-logging serviceability captures connectivity information related to wireless clients. Serviceability is divided into the following categories:
Global Trace Log: Global trace logging is a mechanism to capture client connectivity information, and is enabled by default.
Filtered Trace Log: To start packet logging on a filtered trace buffer, you must enable filters using debug commands. Filters capture only the specific packet type or the packets based on the MAC address of the clients.
The following are the features of packet logging:
In addition to DHCP, Neighbor Discovery, and ARP packets, you can also add or remove other packet capture filters.
Display filters are set to pick a subset of logged packets.
Packet-logging data provides information such as the client MAC address, client IP address, VLAN, interface, packet type and time delta, that is required for debugging.