Router 2811 port problem

Answered Question
Jan 29th, 2009

I am trying to work on the Cisco Packet tracer 5.0 for some time now.. But everytime i configure an interface and then verify it show the "show" command. I am getting an information displayed that says the port is disabled .. Can anyone please provide me with the solution for this problem. For a better view of the problem please check the attachment.

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Correct Answer by Giuseppe Larosa about 7 years 11 months ago

Hello Vishal,

by default interfaces are admin down

do

int ser1/0

no shutdown

to be able to use it

Hope to help

Giuseppe

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Correct Answer
Giuseppe Larosa Thu, 01/29/2009 - 00:37

Hello Vishal,

by default interfaces are admin down

do

int ser1/0

no shutdown

to be able to use it

Hope to help

Giuseppe

Giuseppe Larosa Thu, 01/29/2009 - 01:08

Hello Vishal,

now is different the serial interface is down/down

before it was admin down/down.

A serial interface to be up/up needs to be connected to some device that makes leads to be up:

at the end of the show you see:

DCD down carrier

DSR down

CTS down

these are from L1 DCE

DTR and RTS are from the router serial interface

see the following from a router in production

sh int ser4/2

Serial4/2 is up, line protocol is up

[...]

446 carrier transitions DCD=up DSR=up DTR=up RTS=up CTS=up

if you are connecting two routers in back-to-back one has to provide clock:

use

clock rate 2000000

Hope to help

Giuseppe

ohassairi Thu, 01/29/2009 - 00:37

by default all ports are disabled.

you must go under the port and use the command "no shutdown"

then the port will be activated.

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