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Cisco Bug: CSCvs31857 - 4800 series AP causes duplex mismatch log on mGig when speed is set to auto on 9400 Catalyst switch

Last Modified

Jan 08, 2020

Products (1)

  • Cisco Aironet 1850 Series Access Points

Known Affected Releases

8.10(105.0) 8.8(125.0)

Description (partial)

Symptom:
4800 series AP shows port as full duplex on mGig interface but there is a speed discrepancy where although the IP interface brief lists 5 Gbps, the interface wired 0 details show full duplex at 10 Gbps instead of 5 Gbps. Because on switch speed is auto on 5 Gbps as full duplex, the 10 Gbps create the mismatch.

COS Shell:
======
#show int wired 0
wired0    Link encap:Ethernet  HWaddr F4:DB:E6:21:75:30 eMac Status: UP
          inet addr:10.230.126.169  Bcast:10.255.255.255  Mask:255.255.255.255
          UP BROADCAST RUNNING PROMISC MULTICAST  MTU:2400  Metric:1
          full Duplex, 10000 Mb/s

Conditions:
4800 series APs connected to 9k switches
AireOS WLC code 8.8.125.0 / 8.10.105.0
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