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Cisco Bug: CSCuo14185 - N7K: Incorrect CDP Duplex information cached after VDC reload

Last Modified

Nov 27, 2020

Products (7)

  • CiscoPro Workgroup EtherSwitch Software
  • Cisco Nexus 7000 10-Slot Switch
  • Cisco Nexus 7000 4-Slot Switch
  • Cisco Nexus 7700 18-Slot Switch
  • Cisco Nexus 7000 18-Slot Switch
  • Cisco Nexus 7700 10-Slot Switch
  • Cisco Nexus 7000 9-Slot Switch

Known Affected Releases

6.2(2)

Description (partial)

Symptom:
The following log will be generated by the CDP process:
CDP-4-DUPLEX_MISMATCH Duplex mismatch discovered on Ethernet x/y, with mgmt0

And the CDP table for the Mgmt0 connected interface will show inconsistent duplex information for the connected logical interfaces:

N7K-2# show cdp neighbors interface ethernet 1/5 detail
----------------------------------------
Device ID:N7K-1 (<serial number>)
System Name: N7K-1

Interface address(es):
    IPv4 Address: <ip-Address>
Platform: N7K-C7010, Capabilities: Router Switch Supports-STP-Dispute
Interface: Ethernet1/5, Port ID (outgoing port): mgmt0
Holdtime: 149 sec

Version:
Cisco Nexus Operating System (NX-OS) Software, Version 6.2(2)

Advertisement Version: 2
Duplex: full

MTU: 1500
Mgmt address(es):
    IPv4 Address: <ip-address>
----------------------------------------
Device ID: N7K-2(<serial-number>)
System Name: N7K-2

Interface address(es):
    IPv4 Address: <ip-address>
Platform: N7K-C7010, Capabilities: Router Switch Supports-STP-Dispute
Interface: Ethernet1/5, Port ID (outgoing port): mgmt0
Holdtime: 136 sec

Version:
Cisco Nexus Operating System (NX-OS) Software, Version 6.2(2)

Advertisement Version: 2
Duplex: half   <<====

MTU: 1500
Mgmt address(es):
    IPv4 Address: <ip=address>

Conditions:
Issue is seen with NXOS 6.2(2) or later.
AND
Mgmt0 interface must be looped back to a VDC of the same N7K switch.
AND
Occurs after the connected VDC reloads.
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Bug Details Include

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