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CISCO 2503 Router ethernet 0 Full Duplex?

Posted on 2007-03-26
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Last Modified: 2012-06-21
CISCO 2503 Router

I get a message in cisco 2503 router every few seconds "duplex mismatch discovered on Ethernet0 (not full duplex), with Router
EU FastEthernet0/0 (full duplex)."

How do I change this to be full duplex? What is the command?

Thanks
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Question by:shiplu44
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by:RPPreacher
ID: 18792178
#conf t
(config)#interf fa0/0
(config-if)#duplex full
(config-if)#exit
(config)#exit
#write mem
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Author Comment

by:shiplu44
ID: 18792240
Router2503(config-if)#duplex full
                       ^
% Invalid input detected at '^' marker.

Router2503(config-if)#
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Author Comment

by:shiplu44
ID: 18792245
It doesn't recognize DUPLEX as a command
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Expert Comment

by:RPPreacher
ID: 18792256
Are you certain this is a fast ethernet interface and not ethernet?

ethernet is 10 half only.
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Author Comment

by:shiplu44
ID: 18792263
Router2503#show ip int brief
Interface                  IP-Address      OK? Method Status                Protocol
BRI0                       unassigned      YES NVRAM  up                    up
BRI0:1                     unassigned      YES unset  down                  down
BRI0:2                     unassigned      YES unset  down                  down
Ethernet0                  10.12.29.79     YES NVRAM  up                    up
Serial0                    unassigned      YES NVRAM  down                  down
Serial1                    unassigned      YES NVRAM  down                  down
Router2503#
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Expert Comment

by:RPPreacher
ID: 18792264
The error message says "Ethernet0" not FastEthernet0
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Author Comment

by:shiplu44
ID: 18792267
If so then how do I disable that message from appearing on the screen every few seconds?
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Expert Comment

by:RPPreacher
ID: 18792271
Ethernet0 is not a fast ethernet port.

Ethernet ports are half duplex only.
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RPPreacher earned 125 total points
ID: 18792276
Whatever it is connected to needs statically set to 10 half.
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Author Comment

by:shiplu44
ID: 18792278
Last one ... please post the command to do this?

Whatever it is connected to needs statically set to 10 half.
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Expert Comment

by:RPPreacher
ID: 18792299
What is it connected to?

Trace the cable from the ethernet0 port to the device on the other end.  That device needs configured.
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