有意思的是，在CCIE的lab考试中，可以通过一些debug和show的命令让你很快地通过CCIE的lab考试，下面是CCIE lab 考试中常用的show命令。
Catalyst交换机
show vlan brief
show interface trunk
show interface switchport
show vtp status
show spanning-tree vlan
Frame帧中继网络
show frame map
show frame pvc
OSPF路由协议
show ip route ospf
show ip ospf neighbor
show ip ospf
show ip ospf interface
EIGRP路由协议
show ip eigrp neighbor
show ip eigrp topology
show ip route eigrp
show ip protocol
RIP version 2
show ip route rip
clear ip route *
debug ip rip
BGP
show ip bgp summary
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
IP Multicast
show ip pim neighbor
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
好好利用这些debug和show的命令，对在CCIE lab考试时候的排错有很大的帮助。