Cisco 2501 ethernet0 line-protocol down .......help

[sr5873]

Hi,
I have a 2501 router and i am trying to bring the ethernet0 interface up but it says interface is up/line protocol is down. I am connecting e0 to pc via tranciever. Am i doing anything wrong?

If I connect the same cable to my cable modem it works. Also can you suggest on what i need to use dhcp to get ip from my isp (for router interface).

Thanks
SRI

 

[svermill]

You probably need an ethernet rollover cable between that transceiver and the router.

As for your DHCP issue, per an earlier thread, the 'ip address dhcp' command was introduced in 12.1.2(T). I think it should be in any 12.2.x code.

 

[rburke]

Not a rollover cable(that is for the console), but a crossover cable. You can buy them from just about any store that has regular straight-thru cables(Best Buy, Radio Shack...). If you need more help let us know....

burke

 

[Guest_imported]

Thank you. I will get a crossover cable......

Srikar

 

[jeter]

You can always make one!

pin 1 w/o to w/g
pin 2 o/w to g/w
pin 3 w/g to w/o
pin 4 b/w to b/w
pin 5 w/b to w/b
pin 6 g/w to o/w
pin 7 w/br to w/br
pin 8 br/w to br/w


“Reserve your right to think, for even to think wrongly is better than not to think at all”

Fisher CCNA,(CCNP-Routing)
UOP Student BSIT

 

[jamin123]

Line protocol down is a layer 2 problem. Don't wast time troubleshooting layer 1. Try hdlc, shut and no shut not at the same time.

 

[ChrisAC]

If the line protocol is down then it's usually the result of a physical problem like cabling. I don't think that hdlc will be of much use on an ethernet interface to the PC. Get the cable right and the line will come up.

Chris.
************************
Chris Andrew, CCNA
chrisac@gmx.co.uk
************************

 

[Guest_imported]

I guess chrisac is right.....As i said if i connect my cable to my cable modem it works...I mean line protocol is up...at this point i need a crossover cable...I am going to get it today and will post results here..

I would aslo like to thank all of you guys who responded..this thread was my first post here and I am very happy to see so many responses....sharing knowledge is a gift....

Sri

 

[jamin123]

Sorry, did not notice that it is an e0 int. HDLC is only for serial.

line protocol down is layer 2 problem.

 

[CCIEWANNABE]

Interface is up and Line Protocol is down
means there is a disconnected Ethernet interface.
My guess it’s a bad cable or crossover cable. It could all so be a lose cable. A bad port could also produce this result. Its possible to use perfectly good cables but in the wrong places.

Crossover cables are for Back to back connections.
Straight-through is used to make a connection between a router and a concentrator or a switch.

Crossover cables look just like a Straight-through cable. Examine the pin patterns or read the printed labeling on the cable shielding jacket.
Route once; switch many

 

[CCIEWANNABE]

One last note; a Cisco rollover cable is intended for accessing a console port. Console to Serial port Route once; switch many

 

[ChrisAC]

Just one more thing. Why are you connecting eth0 on the router to your PC with a transceiver? May I be so bold as to suggest that you just connect it to a network card on your PC via a crossover cable, or a network hub or switch with a regular CAT5 cable.

Chris.
************************
Chris Andrew, CCNA
chrisac@gmx.co.uk
************************

 

[Guest_imported]

Hi,

I am just begining to understand these technologies...actually i don't have a hub or switch but getting one soon.

I also got my crossover cables as I write this message....I am going to connect them now...

Thanks for info..
Sri

 

[Dattman]

This is definitely a cable issue. If (as it sounds like you are doing) you have the tranciever into the E0 interface of the router, you should then have a crossover cable (as described by Jetter above) connected to your PC's NIC card (if you are not going through a hub or switch):

E0 int->tranciever->crossovercable->NIC

The same will hold true if you are connecting to your PC's serial interface via another tranciever :

E0 int->tranciever->crossovercable->tranciever->serial port

Hope this helps

The Dattman

 

[Guest_imported]

I plugged in crossover cable and the interface and line protocol both are up.

Thanks Again.
Sri