Command Show IP DHCP Binding Use This command lists the addresses that the DHCP service on a router has assigned. Syntax Router#show ip dhcp binding Example In the below example we configure R1’s Fa0/0 to use DHCP. R1(config)#int fa0/0 R1(config-if)#ip address dhcp R1(config-if)# *Mar 1 01:39:29.295: %DUAL-5-NBRCHANGE: IP-EIGRP(0) …

Command Show Sessions Use This command displays information about the telnet sessions that the router has established. Syntax Router#show sessions Example In this example, we use show sessions on R1 after we telnet to R2 and suspend the session. R1(config)#do telnet 10.1.1.2 Trying 10.1.1.2 … Open User Access Verification Password: …

Command Show Interfaces Use This command displays detailed layer 1 information about interfaces on a device, including tracking errors. It is useful for quickly checking the status of the device. Syntax Router#show interfaces OR Router#show interfaces <interface> Example In the below example we use show interfaces to quickly see layer 1 …

Command Show Frame-Relay PVC Use This command displays any PVC information the router has learned about. Syntax Router#show frame-relay pvc <dlci> 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)#do …

Command Show Controller Use This command displays very detailed controller and interface information. Most of the time, you will only use this command to see if a serial link is a DCE or a DTE. Syntax Router#show controller <interface> Example In this example, we use show controller s1/1 | …

Command Show Startup-Config Use Shows the saved startup configuration on a router. Syntax Router#show startup-config Example In this example, the show start command is executed to display the startup config on R1. R1#show start Building configuration… Current configuration : 1106 bytes ! version 12.4 service timestamps debug datetime msec service …

Command Show CDP Neighbors Detail Use This command shows detailed information about the Cisco devices that are directly connected to your current device, including IP addresses. CDP is a Cisco proprietary protocol and will only detect Cisco products, although there are some vendors that do work with it. Additionally, …

Command Show IP NAT Statistics Use This command shows various NAT statistics. It is useful for troubleshooting. Syntax Router#show ip nat statistics Example In the below example we configure R2 to translate addresses from 10.1.1.0/24 to 10.2.2.0/24. R2(config)#access-list 25 permit 10.1.1.0 0.0.0.255 R2(config)#ip nat inside source list 25 …

Command Show IP Route OSPF Use Allows you to see just the OSPF routes installed in the routing table. Syntax Router#show ip route ospf Example This example demonstrates the show ip route ospf command. First, here’s the full routing table for R2. R2(config-if)#do sh ip route Codes: C – connected, S – …

Command Show IP Route Use Allows you to see the ip route tabe, which is a summary of the routing for specific IP addresses, network masks and protocols. Syntax Router#show ip route Example Here’s an example of the show ip route output from R2. R2(config-if)#do sh ip route Codes: C …