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New Member

2801 fastethernet down

I have a 2801 router.  The Fa0/0 int shows up/down.  I have plugged it into diffrent cisco and non cisco switches and even a cross over cable to my laptop.  I cant seem to get the protocol up.  I have changed the speed to 100 and duplex to full to try to get it up that way and nothing.  This is what I have:

interface FastEthernet0/0

ip address 10.105.1.253 255.255.255.0

duplex auto

speed auto

again as you can see nothing out of the ordinary. any ideas?

  • WAN Routing and Switching
1 ACCEPTED SOLUTION

Accepted Solutions
Purple

2801 fastethernet down

Hi,

router to switch is straight through cable, are you sure you selected the correct cable?

How are the the link leds when connecting the 2 ?

Regards.

Alain

Don't forget to rate helpful posts.
7 REPLIES
Purple

2801 fastethernet down

Hi,

router to switch is straight through cable, are you sure you selected the correct cable?

How are the the link leds when connecting the 2 ?

Regards.

Alain

Don't forget to rate helpful posts.
New Member

Re: 2801 fastethernet down

yes,  2801 -> switch using straight through.  I have verified cable works.  and all light on both the router and the switch being plugged into are solid green.  Also verified the swith port works.

FYI.  I deleted all configs and all I have done so far is put an ip address on the FA0/0 int and did a no shut

when I do "ping 10.105.1.253 source fa0/0" from itself I get

Invalid source interface - IP not enabled or interface is down

and the 10 ip address is the one assigned to Fa0/0

same thing with loopback

r3#ping 127.0.0.1 source fastEthernet 0/0

% Invalid source interface - IP not enabled or interface is down

Purple

2801 fastethernet down

Hi,

if the interface is down then the ping won't work and there is no loopback( 127.x.x.x/8) on a router, this is on hosts for testing their tcp/ip stack.

But you marked the thread as resolved and it is not, why did you do so?

What about connecting f0/1? is it still the same to what type of switch port are you connected?

Regards.

Alain

Don't forget to rate helpful posts.
New Member

2801 fastethernet down

I am having the same issue with fa0/1.  Blank config and all I am doing is giving the int an ip address. I know that i can ping 10.105.1.254 because I have connected my PC to the same switch and it works.  I have tried both setting the mode to trunk and to access and neither of them work?

any ideas?

Purple

2801 fastethernet down

Hi,

just to be sure:

sh ip int br on the router and sh int status on the switch

Regards.

Alain.

Don't forget to rate helpful posts.
New Member

Re: 2801 fastethernet down

sh ip int brief on router shows up/down

sh ip int brief on switch shows up/up

New Member

Re: 2801 fastethernet down

sorry i found the problem.  After all this time.  The cable was bad.

lol

thx for the help.

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