I am having a duplex mismatch on faste trunk uplink between a 2950 and 6500. The 2950 auto neg at full/100, the 6500 auto neg at half/100. I tried adding the command "duplex full" on the 6500 interface and drop connection.
This is my interface config:
2950# interface FastEthernet0/25
switchport mode trunk
switchport trunk encapsulation dot1q
switchport mode trunk
What am I missing? and why will this not auto neg at full duplex?
Is F0/25 a fiber interface on the 2950 ? That would be 100/full by default. What is on the 6500 end ? If you can't set the speed on the 2950 then it must be fiber . If the 6500 end has a media converter on it that may be why it came up as half duplex.
This link has ports with mismatching duplex. Port GigabitEthernet0/26 on device switch1 with mode auto-duplex
Device type and OS version of switch1: Cisco IOS Software, C3560 Software (C3560-IPBASEK9-M), Version 12.2(52)SE, RELEASE SOFTWARE (fc3)
Port GigabitEthernet2/3/10 on device switch2 with mode full-duplex
Device type and OS version of switch2: Cisco IOS Software, s72033_rp Software (s72033_rp-IPSERVICESK9_WAN-M), Version 12.2(33)SXI, RELEASE SOFTWARE (fc2) Technical Support: http://www.cisco.com/techsupport
False Link Duplex Mismatch messages, with the option to fix this:
interface Gi0/26 speed auto
[ams-dc-cr001] interface Gi2/3/10 speed auto
The only problem is that you can't see this command back in the configuration of the switch, because it is allready in auto mode.
There are no errors whatsoever on the interfaces of both switches.
I don't think I want to change any of the settings on the switch, just because Ciscoworks can't handle this correctly.
Does anyone know how to fix this, or is this jet another bug?
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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