Friday, September 24, 2010

Some Serial Interface knowledge

2 routers can be connected using serial interfaces.

After set them up to see the encapsulations 

Type

sh interfaces serial 1/0

You will probably see HDLC(Layer 2 protocol runs in place of ethernet,stands for high level data link control,it’s very simple to use,plug the cable in and routers serially connected will run HDLC,no configuration necessary).

To change it to ppp(point to point protocol)

From global config mode

Type

int serial 1/0
encapsulation ppp
exit

you have to do it both routers to up the connection

In a serial connection one side acts as a DCE another side as the DTE

To see it in a router

From global config mode

Type

sh controllers serial 1/0

In DCE side you will see the clockrate applied.

To set the clock rate manually

From global config mode

int serial 1/0
clock rate 64000
exit

 Courtesy to Cisco Guru Jeremy Cioara

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