Troubleshooting Command Blitz

#show controllers serial 0/0
Shows clock rate and DCE/DTE

#show ip interfaces brief
Shows ip addresses, L1/L2 status

#debug ip nat
shows source IP->NAT IP, destination IP and time

#show ip nat translations
shows static nat with inside global, inside local and outside local/global

#show ip nat translations
shows inside and outside interfaces, hits and ACL number

#show ip route
Shows routing table, with indication of how route was learned

#sho ip protocols
info about routing protocols running on router, including interfaces included, networks being routed

#debug ip rip
shows updates, routing table being sent, flash or regular

#debug ip ospf
shows hello, timers, new adjacency

#sho ip ospf neighbor (no "s" at the end)
sho ID of neighbor routers, dead timers, neighbor IP and interface route was learned on (local)

#sho ip ospf database
Shows link states for neighbor (advertising) router, along with the age

#show ip ospf interface serial 0/0
Shows whether or not ospf is running on this interface, process ID, router ID, neighbor counts

# sho ip eigrp neighbors (note - add "s" to eigrp)
Shows address and receiving interface, hold timers,

#show ip eigrp topology
Shows routes in topology table, receiving interface and feasible distance

#sho ip eigrp interfaces
Which interfaces are participating in the eigrp AS

#show cdp neighbors
Connected Cisco devices, local interface they are connected on, capability of the devices, plaform and which port on the connected device

#sho cdp neighbors detail
 Also shows IOS version

#sho ip dhcp binding
Who received an IP address from our pool

#ping 192.168.1.1
U.U.U means that the packet is being blocked by an ACL

#show ip access-lists
#sho access-lists
Both do the same thing, show access lists and hits

#show interface serial 0/0
Find WAN encapsulation type, condition of line

#debug ppp packet
PPP negotiation, state, authentication and errors

#show frame-relay map
interface, IP address and DLCI

#sho frame-relay PVC
statistics for FR

#sho frame-relay lmi
LMI type, send/receive of status updates

#debug frame-relay lmi
shows LMI info, watch for "myseq" and "yourseq" incrementing, "status 0x2" means FR is operational

#show vlans
Which switch interfaces are included in which vlan - a missing interface indicates it is a trunk

#show interfaces trunk
Shows ports that are trunking, their status, encapsulation type and allowed vlans

#show vtp status
version, operating mode, domain name, config revision number

#show vtp password
--self-explanatory