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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. CopyR4(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. CopyR1#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. CopyR2(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. CopyR2(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. CopyR2(config-if)#do sh ip route Codes: C …
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 …
