Troubleshooting Commands

show processes cpu
show memory
show interfaces
show interfaces <intf-id>

show version
show ip interface [brief]
show ipv6 interface [brief]
show interfaces [<intf-id>]
show arp
show ipv6 neighbors
show running-config
show port
show vlan
show tech-supprot
show ip cache flow

[no] debug ?
show protocols

IP SLA Configuration

ip sla <operation-num>
  icmp-echo { <dest-ip-address> | <dest-hostname> } \
            [ source-ip <source-ip-addr> | <hostname> } | \
            source-interface <intf-id>
ip sla schedule <operation-num> [ life { forever | <seconds> }] \
            [ start-time { <hh>:<mm>:[:<ss>] { <month>] \
            | pending | now | after <hh:mm:ss> ] \
            [ ageout <seconds> ] [ recurring ]

no ip sla <operation-num>

Verify/Check statistics:

show ip sla application
show ip sla configuration [<operation-num>]
show ip sla statistics [<operation-num>]

Example:

conf t
ip sla 1
  icmp-echo 192.168.1.5   ! Monitor interface at 192.168.1.5
    frequency 30
    exit
ip sla schedule 1 start-time now life forever

Windows Addressing and Mappings

arp
arp -d      ! Clears cache for repopulation

Check IPv6 Neighbor Table

netsh interface ipv6 show neighbor

Linux/Unix Addressing and Mappings

ifconfig

ip neigh show