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| Author |
Message |
Guest
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 Posted: Tue Apr 18, 2006 10:28 am Post subject: Cisco 837 ethernet0 half-duplex |
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Hi, all,
When I plug in a Cisco837 router into the swich, it gives me a
warning message: CDP-4-DUPLEX_MISMATCH: duplex mismatch discovered on
Ethe
rnet0 (not half duplex).
When I do a "sh interface ethernet0", it shows: "Full-duplex,
10Mb/s".
The IOS is: 12.3(8). Is there anyway to change it to half duplex?
Thanks. |
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Merv
Guest
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| Posted: Tue Apr 18, 2006 12:17 pm Post subject: Re: Cisco 837 ethernet0 half-duplex |
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what switch are you plugging the router into and how is the port
configured ? |
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Merv
Guest
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| Posted: Tue Apr 18, 2006 12:25 pm Post subject: Re: Cisco 837 ethernet0 half-duplex |
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find out if the switch is capable of 100-full or 10-full and set it
accordingly
otherwise on the 837 try
ethernet 0
speed 10
duplex half
exit |
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Guest
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| Posted: Tue Apr 18, 2006 2:54 pm Post subject: Re: Cisco 837 ethernet0 half-duplex |
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I had the same problem on an 837 and 2950 switch. IIRC, setting the
duplex to half and speed to 10, still resulted in CDP duplex mismatch
error, or collisions. I remember reading something about a CDP bug, so
I just disabled CDP on that port.
ie (on 837)
ethernet 0
no cdp enable
exit
or (on switch)
fastethernet 0/24
no cdp enable
exit |
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Guest
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| Posted: Tue Apr 18, 2006 7:13 pm Post subject: Re: Cisco 837 ethernet0 half-duplex |
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under interface ethernet 0, I could not set it to half duplex. have to
disable cdp. it worked. thank you very much guys. |
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Guest
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| Posted: Wed Apr 19, 2006 9:51 am Post subject: Re: Cisco 837 ethernet0 half-duplex |
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| Quote: | Hi, all,
When I plug in a Cisco837 router into the swich, it gives me a
warning message: CDP-4-DUPLEX_MISMATCH: duplex mismatch discovered on
Ethe
rnet0 (not half duplex).
When I do a "sh interface ethernet0", it shows: "Full-duplex,
10Mb/s".
The IOS is: 12.3(8). Is there anyway to change it to half duplex?
Thanks.
|
Rather than disable CDP completely, you can issue the command:
no cdp log mismatch duplex
which just prevents the router reporting these errors. |
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the_Muttster
Guest
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| Posted: Wed Apr 19, 2006 12:04 pm Post subject: Re: Cisco 837 ethernet0 half-duplex |
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wxu3000@yahoo.com wrote:
| Quote: | Hi, all,
When I plug in a Cisco837 router into the swich, it gives me a
warning message: CDP-4-DUPLEX_MISMATCH: duplex mismatch discovered on
Ethe
rnet0 (not half duplex).
When I do a "sh interface ethernet0", it shows: "Full-duplex,
10Mb/s".
The IOS is: 12.3(8). Is there anyway to change it to half duplex?
Thanks.
|
I had the same issue. I fixed the speed on the 2950 end to 10Mbit/HD
and it went away. A bit of reading on the Cisco site at the time led me
to believe that the E0 port isn't full-duplex which is the bug. Rather,
it's a virtual interface of the 4 Fa ports which aren't proper
switchports unlike the 1800 series. Therefore, for simplicity, I treat
it as a hub. |
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none
Guest
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| Posted: Sat Apr 22, 2006 6:03 am Post subject: Re: Cisco 837 ethernet0 half-duplex |
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On Tue, 18 Apr 2006 03:54:03 -0700, bhalicki wrote:
| Quote: | I had the same problem on an 837 and 2950 switch. IIRC, setting the
duplex to half and speed to 10, still resulted in CDP duplex mismatch
error, or collisions.
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At half duplex collisions are OK and normal - if you see frame or other
errors then you have a duplex mismatch.
none |
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