It is interesting that you can pass the CCIE R/S lab exam with very little debugging, and a relatively short list of show commands – here are some of our favorites:
show interface trunk
show interface switchport
show vtp status
show spanning-tree vlan
show frame pvc
show ip ospf database
show ip ospf neighbor
show ip ospf
show ip ospf interface
show ip ospf interface brief
show ip eigrp topology
show ip route eigrp
show ip protocol
clear ip route *
debug ip rip
show ip bgp
show ip bgp neighbor x.x.x.x advertised-routes
show ip bgp regex
show ip bgp rib-failure
show ip route bgp
debug ip mpacket
debug ip pim
show ip pim neighbor
show ip pim interface
show ip pim rp map
show ip mroute count
show ip mroute
show ip route
QoS
show policy-map interface
Catalyst
show vlan briefshow interface trunk
show interface switchport
show vtp status
show spanning-tree vlan
Frame
show frame mapshow frame pvc
OSPF
show ip route ospfshow ip ospf database
show ip ospf neighbor
show ip ospf
show ip ospf interface
show ip ospf interface brief
EIGRP
show ip eigrp neighborshow ip eigrp topology
show ip route eigrp
show ip protocol
RIP version 2
show ip route ripclear ip route *
debug ip rip
BGP
show ip bgp summaryshow ip bgp
show ip bgp neighbor x.x.x.x advertised-routes
show ip bgp regex
show ip bgp rib-failure
show ip route bgp
IP Multicast
show ip pim neighbordebug ip mpacket
debug ip pim
show ip pim neighbor
show ip pim interface
show ip pim rp map
show ip mroute count
show ip mroute
show ip route
QoS
show policy-map interface
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