Do Command on CISCO Router/Switch

Command

Do

Use

Allows you to access privilege level commands while in configuration modes.

Syntax

Router(config)#do <command>

Example

In the below example, the router’s IP information is verified while configuring OSPF

R2#conf t
Enter configuration commands, one per line. End with CNTL/Z.
R2(config)#router ospf 1
R2(config-router)#do sh ip int br | ex unass
Interface IP-Address OK? Method Status Protocol
FastEthernet1/0.24 150.1.24.2 YES NVRAM up up
FastEthernet1/0.42 150.1.42.2 YES NVRAM up up
Loopback0 200.0.0.1 YES NVRAM up up
Loopback24 150.1.124.2 YES NVRAM up up
Loopback42 150.1.142.2 YES NVRAM up up
R2(config-router)#
R2(config-router)#network 150.1.24.2 0.0.0.0 area 24
R2(config-router)#do sh ip route
Codes: C – connected, S – static, R – RIP, M – mobile, B – BGP
D – EIGRP, EX – EIGRP external, O – OSPF, IA – OSPF inter area
N1 – OSPF NSSA external type 1, N2 – OSPF NSSA external type 2
E1 – OSPF external type 1, E2 – OSPF external type 2
i – IS-IS, su – IS-IS summary, L1 – IS-IS level-1, L2 – IS-IS level-2
ia – IS-IS inter area, * – candidate default, U – per-user static route
o – ODR, P – periodic downloaded static route

Gateway of last resort is not set

200.0.0.0/32 is subnetted, 1 subnets
C 200.0.0.1 is directly connected, Loopback0

Instead of using the do command, we would have had to do the following.

R2#conf t
Enter configuration commands, one per line. End with CNTL/Z.
R2(config)#router ospf 1
R2(config-router)#end
R2#
R2#sh ip int br | ex unass
Interface IP-Address OK? Method Status Protocol
FastEthernet1/0.24 150.1.24.2 YES NVRAM up up
FastEthernet1/0.42 150.1.42.2 YES NVRAM up up
Loopback0 200.0.0.1 YES NVRAM up up
Loopback24 150.1.124.2 YES NVRAM up up
Loopback42 150.1.142.2 YES NVRAM up up
R2#conf t
Enter configuration commands, one per line. End with CNTL/Z.
R2(config)#router ospf 1
R2(config-router)#network 150.1.24.2 0.0.0.0 area 24

Obviously this is not the most efficient method. The Do command will become one of your most used and valued command!!!


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