Operating Cisco IOS

status

review firmware

show version

show remotely connected MAC addresses and how those are being resolved

show mac address-table
show mac address-table dynamic 
show mac address-table interface fa0/X
show arp
show ip arp

review the logs

show logging history 

who’s in?

who
show sessions
!clear line vty
where

review aggregates

show etherchannel

review VLANs

show interfaces trunk
show vlan

review more

show connection
show flowcontrol
show ip interface
show ip route

review config

show run
show startup-config
show running-config
show running-config interface
show running-config vlan
show interface gi0/1 trunk
!show archive config diff

review port status

enable
show interface status

Resources

@cisco

Interface and Hardware Components Configuration Guide, Cisco IOS XE Fuji 16.9.x (Catalyst 9400 Switches) https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst9400/software/release/16-9/configuration_guide/int_hw/b_169_int_and_hw_9400_cg/checking_port_status_and_connectivity.html

Checking Port Status and Connectivity https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst4500/12-2/31sg/configuration/guide/conf/connect.pdf

basic commands https://www.cisco.com/E-Learning/bulk/public/tac/cim/cib/using_cisco_ios_software/07_basic_commands_tasks.htm

@community

Commands to find mac-address and IP on a port https://community.cisco.com/t5/switching/commands-to-find-mac-address-and-ip-on-a-port/td-p/2885631

@more

show interface status https://learningnetwork.cisco.com/s/question/0D53i00000KsxGC/show-interface-status

Cisco switch, how to determine MAC address of connected device or wake device up? https://serverfault.com/questions/338462/cisco-switch-how-to-determine-mac-address-of-connected-device-or-wake-device-up#355555


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