The ISA BB keeps extensive counters for each packet that is sent, terminated, or forwarded. These statistics are displayed using the command show isa wlan-gw-group wlan-gw-group-id member member-id statistics. Most statistics are straight-forward operational counters, such number of DHCP messages received or sent; however, there is also an extensive set of error counters available. When a WLAN-GW shows unexpected behavior, these counters can provide preliminary information about the issue. During debugging, it is recommended to first reset statistics to reset old and potentially unrelated error counters.
If a specified statistic displays an unexpected increase, it is not always easy to identify which UE or which behavior in a UE caused this increase. In this case, enable debugging of a specific statistic using the command debug wlan-gw group wlan-gw-group-id statistic. This command generates a hex dump of the first packet causing the statistic to increase in the debug logs. This packet can then be further investigated to determine the root cause and can be used to derive a UE MAC to start UE-based debugging.