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ethernet0 keeps bouncing

zombiecrab
Level 1
Level 1

Hi,

I have just started messing around with cisco routers and I have run into a few things I can not found answers for.

Firstly:

I can configure a router and save the config with 'copy running-config startup-config' but when I restart the router the config is blank.

second:

sometimes I cant start a interface, in this case ethernet0. I issue the command and the interface just bounces.

wouter#show ip interface brief
Interface                  IP-Address      OK? Method Status                Protocol
FastEthernet1              unassigned      YES unset  administratively down down
FastEthernet2              unassigned      YES unset  administratively down down
FastEthernet3              unassigned      YES unset  administratively down down
FastEthernet4              unassigned      YES unset  administratively down down
Ethernet0                  81.137.49.110   YES manual down                  down
ATM0                       unassigned      YES manual administratively down down
Ethernet2                  unassigned      YES manual administratively down down

wouter#config terminal
Enter configuration commands, one per line.  End with CNTL/Z.
wouter(config)#interface ethernet0
wouter(config-if)#no shutdown
wouter(config-if)#shutdown
wouter(config-if)#
*Jan 10 04:47:32.559: %LINK-5-CHANGED: Interface Ethernet0, changed state to administratively down
wouter(config-if)#no shutdown
wouter(config-if)#
*Jan 10 04:47:48.639: %LINK-3-UPDOWN: Interface Ethernet0, changed state to up
*Jan 10 04:47:49.639: %LINEPROTO-5-UPDOWN: Line protocol on Interface Ethernet0, changed state to up
*Jan 10 04:47:54.359: %LINK-3-UPDOWN: Interface Ethernet0, changed state to down
*Jan 10 04:47:55.359: %LINEPROTO-5-UPDOWN: Line protocol on Interface Ethernet0, changed state to down
wouter(config-if)#

No idea why this is happening and I can't find any info online.

The router is a cisco 800

Alex

3 Replies 3