Category: CCNA Study Guide
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. CopyR1#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. CopyR2#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 …
Command Show IP NAT Translation Use This command shows information about NAT translations that are active on the router. Syntax Router#show ip nat translation 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 …
Command show ip route Use Allows you to see just the EIGRP routes installed in the routing table. Syntax R1#show ip route eigrp Example In the below example of show ip route CopyR2(config-if)#do sh ip route Codes: C – connected, S – static, R – RIP, M – mobile, B …
Command Show IP OSPF Database Use Allows users to view the LSA database on the router. Syntax Router#show ip ospf database Example Here is the lsa database on R2. CopyR2#show ip ospf databaseOSPF Router with ID (2.2.2.2) (Process ID 1)Router Link States (Area 0) Link ID ADV Router …
Command Show IP OSPF Inferface Use Displays the OSPF protocol information for the interfaces on the router. Syntax Router(config)#show ip ospf interface Example Here is the interface OSPF information on R2. CopyR2#show ip ospf interface FastEthernet1/0 is up, line protocol is up Internet Address 10.2.2.2/24, Area 0 Process …
Command Show IP EIGRP Interface Use This command shows which interfaces are running the EIGRP process. Syntax Router#show ip eigrp interface Example In the below example we see the EIGRP interface information on R2 CopyR2(config)#do show ip eigrp interface IP-EIGRP interfaces for process 100 Xmit Queue Mean Pacing …
Command Show IP DHCP Conflict Use This command shows information about IP conflicts that are detected during the DHCP negotiation. IP conflicts occur when hosts have statically assigned IP addresses that are within the DHCP configured range, but are not excluded. Syntax Router#show ip dhcp conflict Example Below …
Command Show Tech-Support Use This command is mostly used when you are speaking with Cisco TAC. It displays a lot of information about your device. Syntax Router#show tech-support Example Below is an example of show tech-support. CopyR2#show tech-support —————— show version —————— Cisco IOS Software, 3600 Software (C3640-JK9S-M), Version …
