Cisco CCNA / CCNP Certification Exam: Troubleshooting Direct Serial Connections
A prime topic of your CCNA and CCNP CIT exams will be connecting Cisco routers directly via their Serial interfaces, and while the configuration is straightforward, there are some vital details and show commands you must know in order to pass the exams and configure this successfully in production and home lab networks. Let’s take a look at a sample configuration.
Connecting Cisco routers directly via their Serial interfaces works really well once you get it running – and getting such a connection up and running is easy enough. You can use show controller serial x to find out which endpoint is acting as the DCE, and it’s the DCE that must be configured with the clockrate command.
R3#show controller serial 1
HD unit 1, idb = 0x11B4DC, driver structure at 0x121868
buffer size 1524 HD unit 1, V.35 DCE cable
R3(config)#int serial1
R3(config-if)#ip address 172.12.13.3 255.255.255.0
R3(config-if)#clockrate 56000
R3(config-if)#no shut
Failure to configure the clockrate has some interesting effects regarding the...
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