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。