common Switch troubleshooting commands

For CPU related issues:
Show process cpu sorted
Show process cpu history
Show platform port-asic stats drop
Show controllers cpu-interface
Debug platform cpu-queues
Show plat for ip

For memory issues
Show memory statistics
Show process memory sorted
Show buffers

For link issues
Show interface status | inc connected
Test cable-diagnostics tdr interface <>
Show cable-diagnostic tdr interface <>
Show interface <>
Show interface <> counters
Show interface <> counters errors
Show interface counter errors
Show controller Ethernet-controller <>
Show platform pm if-numbers
Show controllers Ethernet-controller port-asic statistics
Show platform port-asic stats drop <>

Layer 2 forwarding issues
Show interface <> status
Show spanning-tree interface <>
Show interface <> counter
Show mac address-table interface <>
Show mac address-table dynamic address <>
Show spanning-tree vlan <>
Show interface status error-disabled
Show interface <> counter error
Show platform forward
Show spanning-tree vlan <> detail

Layer 3 IP Unicast issues:
Ping
Sh ip arp vlan
Show mac address-table address
Show ip route
Show ip arp
Show platform forward ip

QOS issues:
Show mls qos interface <> stats
Show mls qos map dscp-output-q
Show platform port-asic stats drop
Show mls qos queue-set
Show mls qos maps dscp-output-q
Mls qos queue-set output <> threshold

TCAM issues:
Show platform tcam utilization
Show platform acl oacltcamfull
Show platform acl label <> detail
Show sdm prefer

Stacking issues:
Show switch {detail}
Show platform stack manager
Show switch stack-ring <>
Show controllers utilization
Show switch stack-ports summary