cisco-script-collection/debugging.txt at main · dbrandstetter/cisco-script-collection · GitHub

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# Author: David Brandstetter
# Desc: A modest collection of several commands used for config verification and debugging.

--------------------------------------------------------------------------
## Windows terminal (cmd)

### Show extensive IPv4/IPv6 settings
    ipconfig /all

### Renew the currently leased IPv4 & IPv6 addresses (via DHCP)
    1. ipconfig /release
    2. ipconfig /renew

### Display the IPv4/IPv6 routing table
    route -4/-6 print

### List the IPv4 MAC table (ARP)
    arp -a

### List the IPv6 MAC table (ND)
    1. netsh
    2. interface ipv6
    3. show neighbors
    -> short form: netsh int ipv6 sh n

### List the joined IPv6 multicast groups
    1. netsh
    2. interface ipv6
    3. show joins
    -> short form: netsh int ipv6 sh j

### Trace the hops to some destination (IP or domain name)
    tracert DEST

### Show detailed information regarding all resolved DNS mappings
    ipconfig /displaydns

--------------------------------------------------------------------------

## Cisco router

### Dynamic host configuration protocol (DHCP)
show ip dhcp binding
show ip dhcp server statistics
show running-config | section dhcp
show dhcp lease

### Routing
show ip route [connected|rip|static|summary]
debug ip routing

### Network address translation (NAT)
show ip nat translations
clear ip nat translations *
show running-config | section NAT
debug ip nat

### Open shortest path first (OSPF)
show ip ospf

### Hot standby router protocol (HSRP)
sh standby br

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

## Cisco switch & router

### Secure shell (SSH)
#### List the active sessions at the moment
     show ssh
#### Show ssh configured parameters
     show ip ssh

### List the active protocols on this device
    show ip p

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

## Cisco switch

### Show the currently active switching database manager (SDM) setting
show sdm prefer

### Etherchannel (EC)
#### Show etherchannel summary
     sh e s
#### Show etherchannel load-balance
     sh e l
#### Show etherchannel port-channel
     sh e p

### Spanning tree (STP)
#### Show general spanning tree config
     sh span
#### Show summarized spanning tree config
     sh span sum
#### Show detailed spanning tree config
     sh span d