CUCM Duplex Mismatch Phantom

[f.sorrentino]

hi,

I am looking into a strange issue whereby out CUCM Cluster is reporting the below warning.

"CDP-4-DUPLEX_MISMATCH: duplex mismatch discovered on GigabitEthernet0/3(not half duplex), with xxx-xxx-xxx bond0 (half duplex)."

CUCM shows both ports are 1GB Full Duplex on the switch and CUCM.  However when i do a cdp nei it shows that there is a Duplex mis-match.

admin:show network failover
Bond 0
DHCP         : disabled           Status     : up
IP Address   : x.x.x.x         IP Mask    : 255.255.255.000
Link Detected: no                 Mode       : Auto disabled, N/A, N/A

Ethernet 0
DHCP         : disabled           Status     : up
IP Address   :                    IP Mask    :
Link Detected: yes                Mode       : Auto enabled, Full, 1000MB/s

Ethernet 1
DHCP         : disabled           Status     : up
IP Address   :                    IP Mask    :
Link Detected: yes                Mode       : Auto enabled, Full, 1000MB/s

=========================================================

GigabitEthernet0/3 is up, line protocol is up (connected)

  Hardware is Gigabit Ethernet, address is XXXXXXXXXXXXXXXXXX

  Description: to CUCM

  MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,

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

  Encapsulation ARPA, loopback not set

  Keepalive set (10 sec)

  Full-duplex, 1000Mb/s, media type is 10/100/1000BaseTX

=========================================================

CDP Nei shows a duplex mis-match

Device ID: cucm.xxxxxx

Entry address(es):
  IP address: x.x.x.x

Platform: 7835H2,  Capabilities: Host
Interface: GigabitEthernet0/3,  Port ID (outgoing port): bond0
Holdtime : 176 sec

Version :
Linux 2.6.9-42.ELsmp #1 SMP Wed Jul 12 23:27:17 EDT 2006 CCM:7.0.2.20000-5

advertisement version: 2
Duplex: half (Mismatch)
Management address(es):

I am leaning towards the fact that the switch does not quite know how to deal with the failover configuration on the CUCM.  Both swtich ports have exactly the same configuration.

Any ideas most welcome!

[Aaron Harrison]

Hi

I believe this is a problem with the NIC team software on the CUCM - basically it should report full duplex if the member NICs are full duplex. It is sending CDP messages that indicate otherwise, and the switch is reporting these.

You could raise a TAC case to see if they can fix it or tell you what version of software contains the fix (obviously being an appliance you can't do more than turn the teaming on and off!).

Alternatively you can suppress the errors on the switch side by using this command on the interface:

no cdp log mismatch duplex

Regards

Aaron

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[Joseph Martini · Accepted solution]

If you have network failover enabled here's the bug:

http://tools.cisco.com/Support/BugToolKit/search/getBugDetails.do?method=fetchBugDetails&bugId=CSCsy08872

[Aaron Harrison]

There you go :-)

Didn't look myself, too many things I try to find recently are hidden from 'public' view!

Good work

[f.sorrentino]

Aaron, Joemar,

Thanks for the input. I looked at disabling the cdp msg's on the interface but the no cdp log mismatch duplex command is not there on the switch in global or interface level so dont think it is availble on my current rev IOS (flash:c2960-lanbasek9-mz.122-50.SE1).

As it is not service affecting I will need to speak to my colleague to find out whether its worth upgrading CUCM/Switch or just doing the temp measure.

Thanks.