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New Member

Nexus 5k Throwing Duplex Mismatch error even though Duplex/speed is correct

Hello Guys

We Are facing an issue with Duplex Match. error in nexus 5k

Our Nexus 5k Switch continously throwing Duplex mismtach error on Logs.

2013 Nov  9 07:53:24 FRMA_BK2_CSN5K_02 %CDP-4-DUPLEX_MISMATCH: Duplex mismatch discovered on Ethernet1/11, with LAGInterface0/3/1

2013 Nov  9 07:54:24 FRMA_BK2_CSN5K_02 last message repeated 8 times

2013 Nov  9 07:56:24 FRMA_BK2_CSN5K_02 last message repeated 16 times

2013 Nov  9 07:58:24 FRMA_BK2_CSN5K_02 last message repeated 16 times

2013 Nov  9 08:00:24 FRMA_BK2_CSN5K_02 last message repeated 16 times

2013 Nov  9 08:02:24 FRMA_BK2_CSN5K_02 last message repeated 16 times

2013 Nov  9 08:04:24 FRMA_BK2_CSN5K_02 last message repeated 16 times

2013 Nov  9 08:06:24 FRMA_BK2_CSN5K_02 last message repeated 16 times

2013 Nov  9 08:08:24 FRMA_BK2_CSN5K_02 last message repeated 16 times

2013 Nov  9 08:10:24 FRMA_BK2_CSN5K_02 last message repeated 16 times

2013 Nov  9 08:12:24 FRMA_BK2_CSN5K_02 last message repeated 16 times

2013 Nov  9 08:14:24 FRMA_BK2_CSN5K_02 last message repeated 16 times

2013 Nov  9 08:16:24 FRMA_BK2_CSN5K_02 last message repeated 16 times

2013 Nov  9 08:18:22 FRMA_BK2_CSN5K_02 last message repeated 15 times

The interface is connected to Cisco Wireless lan controller(5508) using port-channel. Other interface in Port channel is not facing an Issue.

This interface is hardcoded with Speed 1000. Same config on WLC also Speed 1000. No ipunt errors observed in the interfaces

But in Switch cdp this interface is showing as Half duplex and flooding the 5k with logs

Please find the Interface configs & CDP outputs,

interface port-channel124

  description Controller Wireless 5508

  switchport mode trunk

  spanning-tree bpduguard enable

  speed 1000

  storm-control broadcast level 80.00

  storm-control multicast level 80.00

  vpc 124

interface Eth 1/10 & 1/11 is binded in port channel 124.

Eth 1/10 --> dont have any Logs and showing full duplex in CDP.

Eth 1/11 --> Having Logs  for duplex mismtach and  showing half duplex

interface Ethernet1/10

  description Controller Wireless 5508 - Port 1

  switchport mode trunk

  speed 1000

  storm-control broadcast level 80.00

  storm-control multicast level 80.00

  channel-group 124

interface Ethernet1/11

  description Controller Wireless 5508 - Port 2

  switchport mode trunk

  speed 1000

  storm-control broadcast level 80.00

  storm-control multicast level 80.00

  channel-group 124

FRMA_BK2_CSN5K_02# sh int eth 1/10

Ethernet1/10 is up

  Hardware: 1000/10000 Ethernet, address: 547f.ee33.d031 (bia 547f.ee33.d031)

  Description: Controller Wireless 5508 - Port 1 - 10.80.82.240

  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, media type is 10G

  Beacon is turned off

  Input flow-control is off, output flow-control is off

  Rate mode is dedicated

  Switchport monitor is off

  EtherType is 0x8100

  Last link flapped 16week(s) 6day(s)

  Last clearing of "show interface" counters 35w2d

  30 seconds input rate 6194968 bits/sec, 1211 packets/sec

  30 seconds output rate 4498096 bits/sec, 1189 packets/sec

  Load-Interval #2: 5 minute (300 seconds)

    input rate 4.81 Mbps, 875 pps; output rate 3.60 Mbps, 863 pps

  RX

    2055924941 unicast packets  547924 multicast packets  1043625 broadcast pack

ets

    2057516490 input packets  1047388804413 bytes

    82164348 jumbo packets  0 storm suppression bytes

    0 runts  0 giants  0 CRC  0 no buffer

    0 input error  0 short frame  0 overrun   0 underrun  0 ignored

    0 watchdog  0 bad etype drop  0 bad proto drop  0 if down drop

    0 input with dribble  0 input discard

    0 Rx pause

  TX

    2407546704 unicast packets  558419255 multicast packets  2765961466 broadcas

t packets

    5731927425 output packets  1625683967743 bytes

    342983729 jumbo packets

    0 output errors  0 collision  0 deferred  0 late collision

    0 lost carrier  0 no carrier  0 babble 0 output discard

    0 Tx pause

  2 interface resets

FRMA_BK2_CSN5K_02# sh int eth 1/11

Ethernet1/11 is up

  Hardware: 1000/10000 Ethernet, address: 547f.ee33.d032 (bia 547f.ee33.d032)

  Description: Controller Wireless 5508 - Port 2 - 10.80.82.240

  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, media type is 10G

  Beacon is turned off

  Input flow-control is off, output flow-control is off

  Rate mode is dedicated

  Switchport monitor is off

  EtherType is 0x8100

  Last link flapped 16week(s) 6day(s)

  Last clearing of "show interface" counters 35w2d

  30 seconds input rate 2059992 bits/sec, 712 packets/sec

  30 seconds output rate 3605536 bits/sec, 680 packets/sec

  Load-Interval #2: 5 minute (300 seconds)

    input rate 1.44 Mbps, 485 pps; output rate 2.73 Mbps, 546 pps

  RX

    1742986162 unicast packets  712358 multicast packets  1587374 broadcast pack

ets

    1745285894 input packets  813329974630 bytes

    107173365 jumbo packets  0 storm suppression bytes

    0 runts  0 giants  0 CRC  0 no buffer

    0 input error  0 short frame  0 overrun   0 underrun  0 ignored

    0 watchdog  0 bad etype drop  0 bad proto drop  0 if down drop

    0 input with dribble  0 input discard

    0 Rx pause

  TX

    1347189732 unicast packets  337957710 multicast packets  2429529386 broadcas

t packets

    4114676828 output packets  1302894776466 bytes

    308726768 jumbo packets

    0 output errors  0 collision  0 deferred  0 late collision

    0 lost carrier  0 no carrier  0 babble 0 output discard

    0 Tx pause

  3 interface resets

FRMA_BK2_CSN5K_02# sh cdp neighbors interface ethernet 1/11 detail
----------------------------------------
Device ID:FRMA_BK2_WLCCS5508_01_100
System Name:
Interface address(es):
    IPv4 Address: 10.80.82.240
Platform: AIR-CT5508-K9, Capabilities: Host
Interface: Ethernet1/11, Port ID (outgoing port): LAGInterface0/3/1
Holdtime: 136 sec

Version:
Manufacturer's Name: Cisco Systems Inc.  Product Name: Cisco Controller  Product
Version: 7.0.240.0  RTOS Version: Erro  Bootloader Version: 1.0.1  Build Type:
DATA + WPS + LDPE

Advertisement Version: 2
Duplex: half

----------------------------------------
Device ID:FRMA_BK2_WLCCS5508_01_100
System Name:
Interface address(es):
    IPv4 Address: 10.80.82.240
Platform: AIR-CT5508-K9, Capabilities: Host
Interface: Ethernet1/11, Port ID (outgoing port): GigabitEthernet0/0/2
Holdtime: 136 sec

Version:
Manufacturer's Name: Cisco Systems Inc.  Product Name: Cisco Controller  Product
Version: 7.0.240.0  RTOS Version: Erro  Bootloader Version: 1.0.1  Build Type:
DATA + WPS + LDPE

Advertisement Version: 2
Duplex: full

FRMA_BK2_CSN5K_02# sh cdp neighbors interface ethernet 1/10 detail
----------------------------------------
Device ID:FRMA_BK2_WLCCS5508_01_100
System Name:
Interface address(es):
    IPv4 Address: 10.80.82.240
Platform: AIR-CT5508-K9, Capabilities: Host
Interface: Ethernet1/10, Port ID (outgoing port): GigabitEthernet0/0/1
Holdtime: 138 sec

Version:
Manufacturer's Name: Cisco Systems Inc.  Product Name: Cisco Controller  Product
Version: 7.0.240.0  RTOS Version: Erro  Bootloader Version: 1.0.1  Build Type:
DATA + WPS + LDPE

Advertisement Version: 2
Duplex: full

From WLC Controller end

(Cisco Controller) >show 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

What might be the issue here?

Thanks for your suggstion

5 REPLIES
Purple

Nexus 5k Throwing Duplex Mismatch error even though Duplex/speed

  The lan controller shows this , which shows "auto" for mode.  Change the switch end to auto instead of a hardcoded speed of 1000 this could be causing your mismatch .  Switch end does not need ot be hardcoded.

From WLC Controller end

(Cisco Controller) >show 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

New Member

Nexus 5k Throwing Duplex Mismatch error even though Duplex/speed

Hi Grant,

Thanks for your sugggestions.But however  we Have 6 Controllers, all are having the same setup as this one.

Only difference i seen for this switch is for the th port 1/11 it is showling 2 CDP info,  one for management interface of WLC and other for Logical interface of WLC, which seems not correct.

Ths CDP info connecting to Logical interface is showing half duplex and cdp info connecting to Physical interface of wlc is showing full duplex.


FRMA_BK2_CSN5K_02# sh cdp neighbors int eth 1/11 detail
----------------------------------------
Device ID:FRMA_BK2_WLCCS5508_01_100
System Name:
Interface address(es):
    IPv4 Address: 10.80.82.240
Platform: AIR-CT5508-K9, Capabilities: Host
Interface: Ethernet1/11, Port ID (outgoing port): LAGInterface0/3/1
Holdtime: 125 sec

Version:
Manufacturer's Name: Cisco Systems Inc.  Product Name: Cisco Controller  Product
Version: 7.0.240.0  RTOS Version: Erro  Bootloader Version: 1.0.1  Build Type:
DATA + WPS + LDPE

Advertisement Version: 2
Duplex: half

----------------------------------------
Device ID:FRMA_BK2_WLCCS5508_01_100
System Name:
Interface address(es):
    IPv4 Address: 10.80.82.240
Platform: AIR-CT5508-K9, Capabilities: Host
Interface: Ethernet1/11, Port ID (outgoing port): GigabitEthernet0/0/2
Holdtime: 125 sec

Version:
Manufacturer's Name: Cisco Systems Inc.  Product Name: Cisco Controller  Product
Version: 7.0.240.0  RTOS Version: Erro  Bootloader Version: 1.0.1  Build Type:
DATA + WPS + LDPE

Advertisement Version: 2
Duplex: full

New Member

Nexus 5k Throwing Duplex Mismatch error even though Duplex/speed

Guys,

Any inputs here????

New Member

I'm having the same issue

I'm having the same issue here - same alert, same CDP info. did you ever get a resolution?

New Member

 Hi  Yes. we managed to

 

Hi 

 

Yes. we managed to resolve it.

 

Disabling the CDP v2 advertisement in the interface. Stops the logs.

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