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CSCve98689 - Repeated CDP-4-DUPLEX_MISMATCH is observed when 1852 and 3802 APs are connected to 3850 switch.

misho23
Beginner
Beginner

Hello,

the same symptoms occurred on the switch WS-C3650-48TS and connected AP Air-AP2802E-E-K9.

Duplex on both devices is same - FULL.

Workaround - disable CDP on the switch interface.

 

5 Replies 5

Meheretab Mengistu
Rising star
Rising star
Hi,

Did you try rebooting the switch? Could you share the interface configuration you have on the switch?
HTH,
Meheretab

Hi,

 

the switch was rebooted 9 weeks ago and now is not possible to reboot it again.

 

interface GigabitEthernetX/X/XX
 description AP
 switchport access vlan XXX
 no cdp enable
 spanning-tree portfast
 spanning-tree bpduguard enable

Hi,

 

the switch was rebooted 9 weeks ago and now is not possible to reboot it again.

 

interface GigabitEthernetX/X/XX
 description AP
 switchport access vlan XXX
 no cdp enable
 spanning-tree portfast
 spanning-tree bpduguard enable

I believe the speed and duplex is negotiated between the switch and the APs. Did you try manually configuring the duplex to Full and enable CDP?
HTH,
Meheretab

james.a.bond
Beginner
Beginner

Same issue with same workaround vWLC Version 8.5.120.0 WS-C3850-48U and 2802i Access Points. Tried every to set speed 1000 duplex full on switchports before adding to etherchannel. Tried adding one port at a time...workaround resolves issue. Definitely a bug. Thanks for the heads up and workaround +5

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