Command Show IP OSPF Interface Brief Use This command gives a brief summary of what interface is currently configured with ospf on the router, as well as the ip address and subnet mask of that interface. Syntax Router#show ip ospf interface brief Example Here is the output of …

Command Show IP EIGRP Neighbor Use This command shows EIGRP adjacency information on the router. This information includes neighbor IP address and the interface that the neighbor is connected to. This also shows the queue (Q). If the queue is ever above zero there is a problem with …

Command Show IP DHCP Pool Use This command allows you to see any DHCP pool information that is configured on the router.. Syntax Router#show ip dhcp pool <name> Example In the below example we will display the configured DHCP information on R3.. R3#show ip dhcp pool Pool VLAN_B …

Command Show IP Access-Lists Use This command displays information about the access-lists that are configured on a router. It also shows information about what lines are matching in the ACL. Syntax Router#show ip access-lists OR Router#show ip access-lists <number or name> Example In the below example we use show access-lists to …

Command Show IP Interface Brief Use This command displays a brief summary of the interfaces on a device. Its useful for quickly checking the status of the device. Syntax Router#show ip interface brief Example In the below example we use show ip interface brief to quickly see how interfaces are …

Command Show Hosts Use This command displays information about the hosts that are configured with the ip hostcommand. Syntax Router#show hosts Example In the below example we use show hosts to verify the hosts that are configured on R2. R2#show host Default domain is not set Name/address lookup uses domain service …

Command Show Frame-Relay Map Use This command verifies the DLCI mappings that the router has learned about. Syntax Router#show frame-relay map Example In this example, we use show frame-relay mapping to verify that R4 has learned about the other links via inverse-arp. We also verify that we can ping. R4(config-if)#do …

Command Show Clock Use Shows the current date and time of the router. Syntax Router>show clock Example In this example, the show clock command is executed to verify the date and time set on the router. R1#show clock 15:57:20.619 UTC Sun Nov 30 2008

Command Show Running-Config Use Shows the current configuration of a device. This is one of the first commands you will enter when trying to understand how a device is configured. Syntax Router#show running-config Example In this example we display the running configuration of R2. R2#show run Building configuration… …

Command Show CDP Neighbors Use This command lists the Cisco devices that are connected to your current device. CDP is a Cisco proprietary protocol and will only detect Cisco products, although there are some vendors that do work with it. Additionally, LLDP was recently released, which is an …