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New Member

Duplex mismatch between N7k and 5508

Hi All,

I met a duplex mismatch issue in our new DC.

The port configuration on the N7k and controller is the same as in other DC

Only difference is version of the NxOS on the N7k.

On N7k 5.2(1) works

On N7k 5.2(7) i get below logs :

2013 Aug 21 22:23:24 xxx %CDP-4-DUPLEX_MISMATCH: Duplex mismatch discovered on Ethernet10/8, with LAGInterface0/3/1

2013 Aug 21 22:24:24 xxx last message repeated 8 times

2013 Aug 21 22:25:24 xxx last message repeated 8 times

2013 Aug 21 22:27:24 xxx last message repeated 16 times

2013 Aug 21 22:29:24 xxx last message repeated 16 times

Port configuration :

interface Ethernet10/8

  description WLC 5508-1

  switchport

  switchport mode trunk

  switchport trunk native vlan 50

  switchport trunk allowed vlan 50,500,570

  spanning-tree port type edge trunk

  channel-group 1100

  no shutdown

xxx# sh int e 10/8

Ethernet10/8 is up

Dedicated Interface

  Belongs to Po1100

  Hardware: 10/100/1000 Ethernet, address: 0006.f6b1.d2f7 (bia 0006.f6b1.d2f7)

  Description:WLC 5508-1

  MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec

  reliability 255/255, txload 1/255, rxload 1/255

  Encapsulation ARPA

  Port mode is trunk

  full-duplex, 1000 Mb/s

Controller 5508 version 7.3.112.0

Controller ports :

Port Summary

           STP   Admin   Physical   Physical   Link   Link

Pr  Type   Stat   Mode     Mode      Status   Status  Trap     POE    SFPType

-- ------- ---- ------- ---------- ---------- ------ ------- ------- ----------

1  Normal  Forw Enable  Auto       1000 Full  Up     Enable  N/A     1000BaseTX

2  Normal  Forw Enable  Auto       1000 Full  Up     Enable  N/A     1000BaseTX

3  Normal  Forw Enable  Auto       1000 Full  Up     Enable  N/A     1000BaseTX

4  Normal  Forw Enable  Auto       1000 Full  Up     Enable  N/A     1000BaseTX

How can i fix this issue ? Ports are set up and show the same - 1000 / Full

the messages are annoying as loggs are almost full of them.

Thank you in advance

Everyone's tags (2)
2 REPLIES
New Member

Duplex mismatch between N7k and 5508

Radoslaw,

Did you ever receive an answer to your question? If you know how to fix this issue, can you let me know? We are experiencing the same issue in our environment.

Regards,

Matt Yoder

New Member

Re: Duplex mismatch between N7k and 5508

Hi Matthew,

The issue is related to bug -> "CDP duplex mismatch when using LAG on 5508 & 8510 WLC” (CSCuc94082)

The fastest way to solve (workaround) this is disable cdp on the controller by executing following command:  config cdp advertise-v2 disable

Hope this helped you

Regards,

Radek

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