Comandi utili Cisco

show errdisable detect 
show interfaces status | incl err-disabled

Per vedere il motivo della disabilitazione se recente (altrimenti vedere sul syslog server):

show logging | include %PM-4-ERR_DISABLE

ip device tracking probe auto-source fallback 0.0.2.1 255.255.0.0 override
errdisable recovery cause dhcp-rate-limit

swXXX(config)#service unsupported-transceiver

Warning: When Cisco determines that a fault or defect can be traced to
the use of third-party transceivers installed by a customer or reseller,
then, at Cisco's discretion, Cisco may withhold support under warranty or
a Cisco support program. In the course of providing support for a Cisco
networking product Cisco may require that the end user install Cisco
transceivers if Cisco determines that removing third-party parts will
assist Cisco in diagnosing the cause of a support issue.

show power inline <interface> detail

show ip dhcp snooping binding interface gigabitEthernet 1/0/22

term mon

debug ip dhcp snooping packet
debug ip dhcp snooping event
debug ip dhcp snooping agent

no debug all
term no mon

show auth sessions interface Gi1/0/25 details