Duplex Mismatch

We recently replaced our T1 and 2600 router with a service from AT&T called Optiman. AT&T has fiber from the outside into a 24 port Catalyst 3550 switch in the MPoE of our building. Cat 5e is running from the MPoE up 5 floors to our server room where it connects to FE1/0 on our 2811 router.
I've enabled QoS on FE1/0 and we cannot seem to get a reliable traffic flow up and down. AT&T has tried to set the interface we're connected to on the 3550 to Auto and Full. Connectivity between our 2811 and the 3550 in the MPoE only seems to work when I hard set FE1/0 to half duplex 100.
Any thoughts on why setting both to 100 full doesn't seem to work?

The cable length is quite likely going to cause you problems, either due to timing or signal (noise or attenuation) issues.
You definitely want to be running it at full duplex, you'll get collisions on a link this long.
As to why it works in half/100, I've seen that many times it is the default fallback duplex/rate when the device has no idea what's going on. Something is is not right, but half/100 you get link up. However once your traffic rate goes up, watch the error rate climb too!
It sounds like you have new equipment, perhaps temporarily put something else inline just to rule it out? The link may be ok, you may just have a bad port. As your running long lengths, the port may be normally ok, but not good enough for this extreme case.

Similar Messages

  • WLC 5508 duplex mismatch error

    Hi I've got a WLC 5508 connected to a Catalyst 6000 switch. In the switch I've get a CDP duplex mismatch error every 30 min.
    %CDP-4-DUPLEXMISMATCH:Full/half duplex mismatch detected on port 3/23
    with the show port command I can see this:
    Port  Name                 Status     Vlan       Duplex Speed       Type
    3/23  WLC           connected  trunk        full        1000 10/100/1000
    With the show CDP neigh I see a duplex mismatch
    C6K9> (enable) sh cdp neig 3/23 detail
    Port (Our Port): 3/23
    Holdtime: 142 sec
    Capabilities: HOST
    Version:
      Manufacturer's Name: Cisco Systems Inc.  Product Name: Cisco Controller  Product Version: 7.0.116.0  RTOS Version: Erro  Bootloader Version: 1.0.1  Build Type: DATA + WPS
    Platform: AIR-CT5508-K9
    Port-ID (Port on Neighbors's Device): GigabitEthernet0/0/1
    VTP Management Domain: unknown
    Native VLAN: unknown
    Duplex: half (Mismatch)
    But in the WLC console there is not half duplex
    (WLC5508) show>port 1
               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
    I don't have errors in the port counters
    How I can resolve this duplex mismatch?

    Try upgrading the firmware of the WLC to 7.0.230.0.

  • 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

    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

  • LINK DUPLEX MISMATCH error

    Hi all,
    i am using cisco LMS 3.2 as when we run the Discripencies Report we get the
    Error of LINK DUPLEX MISMATCH....
    Kindly guide for the same....
    This link has ports with mismatching duplex.
    Port GigabitEthernet0/23 on device MKT_1 with mode auto-duplex
    Device type and OS version of MKT_1:
    Cisco IOS Software, C3560E Software (C3560E-UNIVERSALK9-M), Version 12.2(53)SE2, RELEASE SOFTWARE (fc3)
    Technical Support: http://www.cisco.com/techsupport
    Port GigabitEthernet0/1 on device MKT_3 with mode full-duplex This link has ports with mismatching duplex.
    Port GigabitEthernet0/23 on device MKT with mode auto-duplex
    Device type and OS version of MKT_1:
    Cisco IOS Software, C3560E Software (C3560E-UNIVERSALK9-M), Version 12.2(53)SE2, RELEASE SOFTWARE (fc3)
    Technical Support: http://www.cisco.com/techsupport
    Port GigabitEthernet0/1 on device MKT_3 with mode full-duplex
    But when i check the configuration of both switches it shows as FULL DUPLEX for the above....
    Kindly guide how to resolve the above error....

    This is a known issue with ports set to auto-duplex.  Since the switches do not reflect the current operational duplex, LMS does not know if the port negotiated to full or half.  In that case, it presents the warning so you can investigate.  Once you've confirmed the duplex is correct, you can acknowledge the discrepancy.
    If you upgrade your switches to 12.2(55)SE, then the switch will report the operational duplex, and this discrepancy will go away on its own.  The bug that fixed this was CSCtc12593

  • Duplex Mismatch when connecting ip phone with 2950 switch

     When I connect my Cisco IP Phone 7960 with 2950 Switch (any access port within voice vlan), I get the message on Port duplex mismatch but the phone works properly.
     From my switch the speed setting is 100/Full but from the Phone its Auto.
     My Question is when I try to change duplex settings from Phone, it doesn't gives me any option instead only one option available to save so kindly someone tell me the best way to fix this from Phone or do I have to change the duplex from switch to AUTO ?

    Thanks but When I connect with my Cisco 2950 Switch, I can see the weird kind of language as per my attachment.
    It wasn't yesterday when I first configured from scratch but just seen today.
     Switch is working good with Cisco IP phone connected with it.

  • Duplex mismatch on phone

    Hi
    Can someone explain the following to me please.All our ip phones are deployed with their settings pc/sw config as auto/auto. Desktops are all on 100fullmb as are the 3750 switch ports they connect to. Mostly all is fine but sometimes I get duplex mismatches on syslog server. When I change phone settings to 100full it resolves. How come this happens on some and not others.
    Also what is best practice as we are deploying in other offices now; I would have though everything set to 100full.
    Thanks ,
    Frank

    If you manually set a port to 100/full then plug in a device set to auto/auto that device will default to 100/half. If you set one device manually you have to set whatever it connects to manually as well. Best practice is to set everything to auto negotiate and that will result in 100/full. In your case you have all devices with a duplex mismatch and you should be having lots of performance and voice quallity issues.
    Take a look at this link for details on how ethernet port speed and duplex negotiation works.
    http://www.cisco.com/en/US/customer/products/hw/switches/ps700/products_tech_note09186a00800a7af0.shtml

  • XP vs W7 communications coping with duplex mismatch?!?

    Whilst deploying a Windows 7 SP1 Pro Standard Operating Environment to one of our 60+ sites we were having some massive comms issues.  The site is on a relatively slow (max 2Mbps link), but the difference in consistency between the former XP and
    'new' W7 machines is striking
    e.g. SOME W7 log in taking 40+mins (compared to XP based machine approx 2mins), RDP sessions from XP based machine fine compared to unusable from W7 machine, Lost SSL sessions on W7 machines compared to 'normal' functionality on XP machines, etc.
    So, the fundamental issue appears to have been a duplex mismatch between the router (3rd party managed) and the sites 'core' switch.
    However, we are struggling to understand why the W7 machines were so much more susceptible to issues compared to the XP machines... I understand that the TCP/IP stack was fundamentally rewritten between XP and Vista/W7, but can anyone point to anything that
    would explain why the W7 machines exposed the issue so much more acutely?
    I'd appreciate any thoughts or suggested areas of investigation?
    Thanks
    David

    Hi,
    Based on my experience, you may check the netmon traces or monitor the performan which is in the task manager.
    Download Microsoft Network Monitor Tool from the following link and install it on the two machines. 
    http://www.microsoft.com/downloads/details.aspx?displaylang=en&FamilyID=983b941d-06cb-4658-b7f6-3088333d062f
    Best regards,
    Steven Song
    Please remember to click “Mark as Answer” on the post that helps you, and to click “Unmark as Answer” if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.

  • 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

    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

  • %CDP-4-DUPLEX_MISMATCH: duplex mismatch discovered on FastEthernet0/0 (not full duplex) between Router and switch

    On Router
    rAWKRdae01 uptime is 1 day, 23 hours, 47 minutes
    System returned to ROM by power-on
    System restarted at 06:13:17 GMT Wed Aug 13 2014
    System image file is "flash:c2800nm-advipservicesk9-mz.124-15.T9.bin"
    interface FastEthernet0/0
     no ip address
     duplex auto
     speed auto
    end
    Logs
    ================================
    034146: Aug 15 05:55:40.231 UTC: %CDP-4-DUPLEX_MISMATCH: duplex mismatch discovered on FastEthernet0/0 (not full duplex), with sALKRdae01.baxter.com GigabitEthernet1/1/1 (full duplex).
    034147: Aug 15 05:56:40.228 UTC: %CDP-4-DUPLEX_MISMATCH: duplex mismatch discovered on FastEthernet0/0 (not full duplex), with sALKRdae01.baxter.com GigabitEthernet1/1/1 (full duplex).
    034148: Aug 15 05:57:04.420 UTC: %SEC-6-IPACCESSLOGP: list SecureInternet denied udp 192.230.123.37(53) -> 119.201.190.90(44014), 1 packet
    034149: Aug 15 05:57:40.229 UTC: %CDP-4-DUPLEX_MISMATCH: duplex mismatch discovered on FastEthernet0/0 (not full duplex), with sALKRdae01.baxter.com GigabitEthernet1/1/1 (full duplex).
    034150: Aug 15 05:58:40.230 UTC: %CDP-4-DUPLEX_MISMATCH: duplex mismatch discovered on FastEthernet0/0 (not full duplex), with sALKRdae01.baxter.com GigabitEthernet1/1/1 (full duplex).
    034151: Aug 15 05:59:40.227 UTC: %CDP-4-DUPLEX_MISMATCH: duplex mismatch discovered on FastEthernet0/0 (not full duplex), with sALKRdae01.baxter.com GigabitEthernet1/1/1 (full duplex).
    034152: Aug 15 06:00:05.707 UTC: %SEC-6-IPACCESSLOGP: list SecureInternet denied tcp 60.169.77.13(6000) -> 119.201.190.90(8088), 1 packet
    034153: Aug 15 06:00:27.476 UTC: %SEC-6-IPACCESSLOGP: list SecureInternet denied tcp 109.120.169.206(80) -> 112.217.135.50(11), 1 packet
    034154: Aug 15 06:00:40.224 UTC: %CDP-4-DUPLEX_MISMATCH: duplex mismatch discovered on FastEthernet0/0 (not full duplex), with sALKRdae01.baxter.com GigabitEthernet1/1/1 (full duplex).
    034155: Aug 15 06:01:40.225 UTC: %CDP-4-DUPLEX_MISMATCH: duplex mismatch discovered on FastEthernet0/0 (not full duplex), with sALKRdae01.baxter.com GigabitEthernet1/1/1 (full duplex).
    ================================
    On Switch
    interface GigabitEthernet1/1/1
     description connection to rAWKRdae01
     switchport trunk native vlan 100
     switchport trunk allowed vlan 100
     switchport mode trunk
     load-interval 30
     speed 100
     duplex full
     service-policy output 3850_QUEUE_2P6Q3T
    end
    Log:
    =================================
    000440: Aug 15 05:44:59 GMT: %CDP-4-DUPLEX_MISMATCH: duplex mismatch discovered on GigabitEthernet1/1/1 (not half duplex), with rAWKRdae01.baxter.com FastEthernet0/0 (half duplex).
    000441: Aug 15 05:45:59 GMT: %CDP-4-DUPLEX_MISMATCH: duplex mismatch discovered on GigabitEthernet1/1/1 (not half duplex), with rAWKRdae01.baxter.com FastEthernet0/0 (half duplex).
    000442: Aug 15 05:46:59 GMT: %CDP-4-DUPLEX_MISMATCH: duplex mismatch discovered on GigabitEthernet1/1/1 (not half duplex), with rAWKRdae01.baxter.com FastEthernet0/0 (half duplex).
    000443: Aug 15 05:47:59 GMT: %CDP-4-DUPLEX_MISMATCH: duplex mismatch discovered on GigabitEthernet1/1/1 (not half duplex), with rAWKRdae01.baxter.com FastEthernet0/0 (half duplex).
    000444: Aug 15 05:48:22 GMT: %SNMP-3-AUTHFAIL: Authentication failure for SNMP req from host 10.5.35.33
    000445: Aug 15 05:48:59 GMT: %CDP-4-DUPLEX_MISMATCH: duplex mismatch discovered on GigabitEthernet1/1/1 (not half duplex), with rAWKRdae01.baxter.com FastEthernet0/0 (half duplex).
    000446: Aug 15 05:49:59 GMT: %CDP-4-DUPLEX_MISMATCH: duplex mismatch discovered on GigabitEthernet1/1/1 (not half duplex), with rAWKRdae01.baxter.com FastEthernet0/0 (half duplex).
    000447: Aug 15 05:50:59 GMT: %CDP-4-DUPLEX_MISMATCH: duplex mismatch discovered on GigabitEthernet1/1/1 (not half duplex), with rAWKRdae01.baxter.com FastEthernet0/0 (half duplex).
    ==================================
    I did try to change duplex setting on fa0/0 of router to Full, but the interface went down and I lost the connectivity to the switch.

    > I did try to change duplex setting on fa0/0 of router to Full, but the interface went down and I lost the connectivity to the switch.
    Did you wait some time to let the divices reestablish the connection again?
    I would configure the Switchport to auto/auto in that case. Autonegotiation works (most of the times ;-) ).

  • Duplex mismatch problem

    Hi,
    I have connectivity like this:
    customer switch forced to 100Mbps/Full duplex----------My end ME-3400-24TS-D configured for Auto negotiation.
    ME-3400 negotiating with 100Mbps/Half duplex.
    Customer facing CRC. Forced ME-3400 to 100Mbps/Full duplex, but link is not coming up.
    ME-3400 IOS is me340x-metroaccess-mz.122-44.SE.bin
    Is it bug related issue?
    Regards
    SKRAO

    Hi guys,
    I´ve been having the same problem whe trying to bring up a link between a gigabitethernet port using the UTP connector and a fastethernet port on a Huawei SW...the only way it works in full duplex /100 is when both sides are auto.
    any idea whats the cause of this behavior?

  • Discrepancy message Link Duplex Mismatch

    I got a lot of Discrepancy messages that operation team said that are wrong messages. one of them is below :
    [sc11601.stc.com.sa,FastEthernet7/1],[rc11601.stc.com.sa,FastEthernet12/0/1]
    interface FastEthernet7/1
    description P2P.RC11601.SC11601 -> RC11601 FE12/0/1
    ip vrf forwarding COM/IS
    ip address 172.20.2.62 255.255.255.252
    ip accounting output-packets
    ip ospf network point-to-point
    speed 100
    duplex full
    wrr-queue bandwidth 70 30
    wrr-queue queue-limit 60 20
    wrr-queue cos-map 1 2 0 1
    wrr-queue cos-map 2 2 2 3 6 7
    mls qos trust dscp
    end
    SC11601#sh interfaces FastEthernet7/1
    FastEthernet7/1 is up, line protocol is up (connected)
      Hardware is C6k 100Mb 802.3, address is 00d0.00ec.7400 (bia 00d0.00ec.7400)
      Description: P2P.RC11601.SC11601 -> RC11601 FE12/0/1
      Internet address is 172.20.2.62/30
      MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,
         reliability 255/255, txload 1/255, rxload 98/255
      Encapsulation ARPA, loopback not set
      Keepalive set (10 sec)
      Full-duplex, 100Mb/s
      input flow-control is off, output flow-control is unsupported
      ARP type: ARPA, ARP Timeout 04:00:00
      Last input 00:00:00, output 00:00:00, output hang never
      Last clearing of "show interface" counters never
      Input queue: 0/75/0/123 (size/max/drops/flushes); Total output drops: 62970
      Queueing strategy: fifo
      Output queue: 0/40 (size/max)
      5 minute input rate 38682000 bits/sec, 18397 packets/sec
      5 minute output rate 179000 bits/sec, 166 packets/sec
      L2 Switched: ucast: 11975833 pkt, 1479635171 bytes - mcast: 14194902 pkt, 3811719114 bytes
      L3 in Switched: ucast: 429215085703 pkt, 94830171248319 bytes - mcast: 0 pkt, 0 bytes mcast
      L3 out Switched: ucast: 6824514014 pkt, 1288372109867 bytes mcast: 0 pkt, 0 bytes
         430025276460 packets input, 94920777016321 bytes, 0 no buffer
         Received 14799648 broadcasts, 0 runts, 0 giants, 0 throttles
         0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
         0 input packets with dribble condition detected
         7696316854 packets output, 1389443700164 bytes, 0 underruns
         0 output errors, 0 collisions, 2 interface resets
         0 babbles, 0 late collision, 0 deferred
         0 lost carrier, 0 no carrier
         0 output buffer failures, 0 output buffers swapped out
    SC11601#
    other interface:
    interface FastEthernet12/0/1
    description P2P.RC11601.SC11601
    ip vrf forwarding COM/IS
    ip address 172.20.2.61 255.255.255.252
    no ip directed-broadcast
    ip accounting output-packets
    ip route-cache flow
    ip ospf network point-to-point
    load-interval 30
    full-duplex
    service-policy input Set-Experimental-COM/IS
    service-policy output HSBB-Policy
    end
    RC11601#sh interfaces FastEthernet12/0/1
    FastEthernet12/0/1 is up, line protocol is up
      Hardware is cyBus FastEthernet Interface, address is 0010.0d59.0981 (bia 0010.0d59.0981)
      Description: P2P.RC11601.SC11601
      Internet address is 172.20.2.61/30
      MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec, rely 255/255, load 85/255
      Encapsulation ARPA, loopback not set
      Keepalive set (10 sec)
      Full-duplex, 100Mb/s, 100BaseTX/FX
      ARP type: ARPA, ARP Timeout 04:00:00
      Last input 00:00:00, output 00:00:00, output hang never
      Last clearing of "show interface" counters 2w6d
      Input queue: 0/75/6/0 (size/max/drops/flushes); Total output drops: 238552
      Queueing strategy: VIP-based fair queuing
      30 second input rate 167000 bits/sec, 148 packets/sec
      30 second output rate 33621000 bits/sec, 17158 packets/sec
         266182338 packets input, 34247141843 bytes, 0 no buffer
         Received 693431 broadcasts, 0 runts, 0 giants, 1 throttles
         0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
         0 watchdog, 0 multicast
         0 input packets with dribble condition detected
         27319889810 packets output, 6807897544306 bytes, 0 underruns
         0 output errors, 0 collisions, 0 interface resets
         0 babbles, 0 late collision, 0 deferred
         0 lost carrier, 0 no carrier
         0 output buffer failures, 0 output buffers swapped out

    momsrv02:/ # snmpwalk rc11601 1.3.6.1.2.1.2.2.1.2
    interfaces.ifTable.ifEntry.ifDescr.1 : DISPLAY STRING- (ascii):  GigabitEthernet1/0/0
    interfaces.ifTable.ifEntry.ifDescr.2 : DISPLAY STRING- (ascii):  Serial2/0
    interfaces.ifTable.ifEntry.ifDescr.3 : DISPLAY STRING- (ascii):  Serial2/1
    interfaces.ifTable.ifEntry.ifDescr.4 : DISPLAY STRING- (ascii):  Serial2/2
    interfaces.ifTable.ifEntry.ifDescr.5 : DISPLAY STRING- (ascii):  Serial2/3
    interfaces.ifTable.ifEntry.ifDescr.6 : DISPLAY STRING- (ascii):  Serial2/4
    interfaces.ifTable.ifEntry.ifDescr.7 : DISPLAY STRING- (ascii):  Serial2/5
    interfaces.ifTable.ifEntry.ifDescr.8 : DISPLAY STRING- (ascii):  Serial2/6
    interfaces.ifTable.ifEntry.ifDescr.9 : DISPLAY STRING- (ascii):  Serial2/7
    interfaces.ifTable.ifEntry.ifDescr.10 : DISPLAY STRING- (ascii):  Serial3/0
    interfaces.ifTable.ifEntry.ifDescr.11 : DISPLAY STRING- (ascii):  Serial3/1
    interfaces.ifTable.ifEntry.ifDescr.12 : DISPLAY STRING- (ascii):  Serial3/2
    interfaces.ifTable.ifEntry.ifDescr.13 : DISPLAY STRING- (ascii):  Serial3/3
    interfaces.ifTable.ifEntry.ifDescr.14 : DISPLAY STRING- (ascii):  Serial3/4
    interfaces.ifTable.ifEntry.ifDescr.15 : DISPLAY STRING- (ascii):  Serial3/5
    interfaces.ifTable.ifEntry.ifDescr.16 : DISPLAY STRING- (ascii):  Serial3/6
    interfaces.ifTable.ifEntry.ifDescr.17 : DISPLAY STRING- (ascii):  Serial3/7
    interfaces.ifTable.ifEntry.ifDescr.18 : DISPLAY STRING- (ascii):  Serial4/0
    interfaces.ifTable.ifEntry.ifDescr.19 : DISPLAY STRING- (ascii):  Serial4/1
    interfaces.ifTable.ifEntry.ifDescr.20 : DISPLAY STRING- (ascii):  Serial4/2
    interfaces.ifTable.ifEntry.ifDescr.21 : DISPLAY STRING- (ascii):  Serial4/3
    interfaces.ifTable.ifEntry.ifDescr.22 : DISPLAY STRING- (ascii):  Serial4/4
    interfaces.ifTable.ifEntry.ifDescr.23 : DISPLAY STRING- (ascii):  Serial4/5
    interfaces.ifTable.ifEntry.ifDescr.24 : DISPLAY STRING- (ascii):  Serial4/6
    interfaces.ifTable.ifEntry.ifDescr.25 : DISPLAY STRING- (ascii):  Serial4/7
    interfaces.ifTable.ifEntry.ifDescr.26 : DISPLAY STRING- (ascii):  Serial5/0
    interfaces.ifTable.ifEntry.ifDescr.27 : DISPLAY STRING- (ascii):  Serial5/1
    interfaces.ifTable.ifEntry.ifDescr.28 : DISPLAY STRING- (ascii):  Serial5/2
    interfaces.ifTable.ifEntry.ifDescr.29 : DISPLAY STRING- (ascii):  Serial5/3
    interfaces.ifTable.ifEntry.ifDescr.30 : DISPLAY STRING- (ascii):  Serial5/4
    interfaces.ifTable.ifEntry.ifDescr.31 : DISPLAY STRING- (ascii):  Serial5/5
    interfaces.ifTable.ifEntry.ifDescr.32 : DISPLAY STRING- (ascii):  Serial5/6
    interfaces.ifTable.ifEntry.ifDescr.33 : DISPLAY STRING- (ascii):  Serial5/7
    interfaces.ifTable.ifEntry.ifDescr.34 : DISPLAY STRING- (ascii):  FastEthernet8/0/0
    interfaces.ifTable.ifEntry.ifDescr.35 : DISPLAY STRING- (ascii):  FastEthernet8/0/1
    interfaces.ifTable.ifEntry.ifDescr.36 : DISPLAY STRING- (ascii):  E1 8/1/0
    interfaces.ifTable.ifEntry.ifDescr.37 : DISPLAY STRING- (ascii):  E1 8/1/1
    interfaces.ifTable.ifEntry.ifDescr.38 : DISPLAY STRING- (ascii):  E1 8/1/2
    interfaces.ifTable.ifEntry.ifDescr.39 : DISPLAY STRING- (ascii):  E1 8/1/3
    interfaces.ifTable.ifEntry.ifDescr.40 : DISPLAY STRING- (ascii):  E1 8/1/4
    interfaces.ifTable.ifEntry.ifDescr.41 : DISPLAY STRING- (ascii):  E1 8/1/5
    interfaces.ifTable.ifEntry.ifDescr.42 : DISPLAY STRING- (ascii):  E1 8/1/6
    interfaces.ifTable.ifEntry.ifDescr.43 : DISPLAY STRING- (ascii):  E1 8/1/7
    interfaces.ifTable.ifEntry.ifDescr.44 : DISPLAY STRING- (ascii):  FastEthernet9/0/0
    interfaces.ifTable.ifEntry.ifDescr.45 : DISPLAY STRING- (ascii):  FastEthernet9/0/1
    interfaces.ifTable.ifEntry.ifDescr.46 : DISPLAY STRING- (ascii):  POS9/1/0
    interfaces.ifTable.ifEntry.ifDescr.47 : DISPLAY STRING- (ascii):  E1 10/0/0
    interfaces.ifTable.ifEntry.ifDescr.48 : DISPLAY STRING- (ascii):  E1 10/0/1
    interfaces.ifTable.ifEntry.ifDescr.49 : DISPLAY STRING- (ascii):  E1 10/0/2
    interfaces.ifTable.ifEntry.ifDescr.50 : DISPLAY STRING- (ascii):  E1 10/0/3
    interfaces.ifTable.ifEntry.ifDescr.51 : DISPLAY STRING- (ascii):  E1 10/0/4
    interfaces.ifTable.ifEntry.ifDescr.52 : DISPLAY STRING- (ascii):  E1 10/0/5
    interfaces.ifTable.ifEntry.ifDescr.53 : DISPLAY STRING- (ascii):  E1 10/0/6
    interfaces.ifTable.ifEntry.ifDescr.54 : DISPLAY STRING- (ascii):  E1 10/0/7
    interfaces.ifTable.ifEntry.ifDescr.55 : DISPLAY STRING- (ascii):  POS10/1/0
    interfaces.ifTable.ifEntry.ifDescr.56 : DISPLAY STRING- (ascii):  E1 11/1/0
    interfaces.ifTable.ifEntry.ifDescr.57 : DISPLAY STRING- (ascii):  E1 11/1/1
    interfaces.ifTable.ifEntry.ifDescr.58 : DISPLAY STRING- (ascii):  E1 11/1/2
    interfaces.ifTable.ifEntry.ifDescr.59 : DISPLAY STRING- (ascii):  E1 11/1/3
    interfaces.ifTable.ifEntry.ifDescr.60 : DISPLAY STRING- (ascii):  E1 11/1/4
    interfaces.ifTable.ifEntry.ifDescr.61 : DISPLAY STRING- (ascii):  E1 11/1/5
    interfaces.ifTable.ifEntry.ifDescr.62 : DISPLAY STRING- (ascii):  E1 11/1/6
    interfaces.ifTable.ifEntry.ifDescr.63 : DISPLAY STRING- (ascii):  E1 11/1/7
    interfaces.ifTable.ifEntry.ifDescr.64 : DISPLAY STRING- (ascii):  FastEthernet12/0/0
    interfaces.ifTable.ifEntry.ifDescr.65 : DISPLAY STRING- (ascii):  FastEthernet12/0/1
    interfaces.ifTable.ifEntry.ifDescr.66 : DISPLAY STRING- (ascii):  POS12/1/0
    interfaces.ifTable.ifEntry.ifDescr.67 : DISPLAY STRING- (ascii):  Null0
    interfaces.ifTable.ifEntry.ifDescr.68 : DISPLAY STRING- (ascii):  Loopback1
    interfaces.ifTable.ifEntry.ifDescr.69 : DISPLAY STRING- (ascii):  Serial8/1/0:0
    interfaces.ifTable.ifEntry.ifDescr.70 : DISPLAY STRING- (ascii):  Serial8/1/1:0
    interfaces.ifTable.ifEntry.ifDescr.71 : DISPLAY STRING- (ascii):  Serial8/1/2:0
    interfaces.ifTable.ifEntry.ifDescr.72 : DISPLAY STRING- (ascii):  Serial8/1/3:0
    interfaces.ifTable.ifEntry.ifDescr.73 : DISPLAY STRING- (ascii):  Serial8/1/4:0
    interfaces.ifTable.ifEntry.ifDescr.74 : DISPLAY STRING- (ascii):  Serial8/1/5:0
    interfaces.ifTable.ifEntry.ifDescr.75 : DISPLAY STRING- (ascii):  Serial8/1/6:0
    interfaces.ifTable.ifEntry.ifDescr.76 : DISPLAY STRING- (ascii):  Serial8/1/7:0
    interfaces.ifTable.ifEntry.ifDescr.77 : DISPLAY STRING- (ascii):  Serial10/0/0:0
    interfaces.ifTable.ifEntry.ifDescr.78 : DISPLAY STRING- (ascii):  Serial10/0/1:0
    interfaces.ifTable.ifEntry.ifDescr.79 : DISPLAY STRING- (ascii):  Serial10/0/2:0
    interfaces.ifTable.ifEntry.ifDescr.80 : DISPLAY STRING- (ascii):  Serial10/0/3:0
    interfaces.ifTable.ifEntry.ifDescr.81 : DISPLAY STRING- (ascii):  Serial10/0/4:0
    interfaces.ifTable.ifEntry.ifDescr.82 : DISPLAY STRING- (ascii):  Serial10/0/5:0
    interfaces.ifTable.ifEntry.ifDescr.83 : DISPLAY STRING- (ascii):  Serial10/0/6:0
    interfaces.ifTable.ifEntry.ifDescr.84 : DISPLAY STRING- (ascii):  Serial10/0/7:0
    interfaces.ifTable.ifEntry.ifDescr.85 : DISPLAY STRING- (ascii):  Serial11/1/0:0
    interfaces.ifTable.ifEntry.ifDescr.86 : DISPLAY STRING- (ascii):  Serial11/1/1:0
    interfaces.ifTable.ifEntry.ifDescr.87 : DISPLAY STRING- (ascii):  Serial11/1/2:0
    interfaces.ifTable.ifEntry.ifDescr.88 : DISPLAY STRING- (ascii):  Serial11/1/3:0
    interfaces.ifTable.ifEntry.ifDescr.89 : DISPLAY STRING- (ascii):  Serial11/1/4:0
    interfaces.ifTable.ifEntry.ifDescr.90 : DISPLAY STRING- (ascii):  Serial11/1/5:0
    interfaces.ifTable.ifEntry.ifDescr.91 : DISPLAY STRING- (ascii):  Serial11/1/6:0
    interfaces.ifTable.ifEntry.ifDescr.92 : DISPLAY STRING- (ascii):  Serial11/1/7:0
    interfaces.ifTable.ifEntry.ifDescr.93 : DISPLAY STRING- (ascii):  Loopback0
    interfaces.ifTable.ifEntry.ifDescr.94 : DISPLAY STRING- (ascii):  GigabitEthernet1/0/0-mpls layer
    interfaces.ifTable.ifEntry.ifDescr.95 : DISPLAY STRING- (ascii):  POS9/1/0-mpls layer
    momsrv02:/ #

  • ASA5510 duplex mismatch

    I have an ASA5510 (7.2(4)) with outside interface conn to ISP's Cisco 2610 (10M Ethernet - NOT FASTETHERNET).
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    This link functioned as desired at 10/FULL.
    Now when I conn the ASA I cannot get the link to come up at full-duplex. The 2610 is running c2600-i-mz.123-19 IOS.
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    Phil

    I did - that's when the link will not establish.

  • Forced Full Duplex changes to Half Duplex (no mismatch errors)

    Guys,
    I am going through a very weird situation and wondered if any of you had any ideas on how I could troubleshoot this issue.
    I am running a 2960 Cisco, which has a single mode fiber cable which is connected to multiple rstp switches designed by a mining technology company.
    The fiber port which connects these switches has "duplex full" written into its configuration.  However, after a random amount of time, anywhere from 1 hour to 24 hours, the port is changes to operate in half duplex.  This is found by doing a show interfaces status.  
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    Once i notice that the port is actually operating in half duplex mode, i log into the port, do a "duplex half"  then "duplex full".. the port goes back into full duplex for another 1-24 hour period.
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    MSTswitchOVCC#sh version
    Cisco IOS Software, C2960S Software (C2960S-UNIVERSALK9-M), Version 12.2(53)SE2, RELEASE SOFTWARE (fc3)
    Technical Support: http://www.cisco.com/techsupport
    Copyright (c) 1986-2010 by Cisco Systems, Inc.
    Compiled Wed 21-Apr-10 06:08 by prod_rel_team
    Image text-base: 0x00003000, data-base: 0x01B00000
    ROM: Bootstrap program is Alpha board boot loader
    BOOTLDR: C2960S Boot Loader (C2960S-HBOOT-M) Version 12.2(53r)SE, RELEASE SOFTWARE (fc3)
    MSTswitchOVCC uptime is 1 week, 6 days, 37 minutes
    System returned to ROM by power-on
    System image file is "flash:/c2960s-universalk9-mz.122-53.SE2/c2960s-universalk9-mz.122-53.SE2.bin"
    This product contains cryptographic features and is subject to United
    States and local country laws governing import, export, transfer and
    use. Delivery of Cisco cryptographic products does not imply
    third-party authority to import, export, distribute or use encryption.
    Importers, exporters, distributors and users are responsible for
    compliance with U.S. and local country laws. By using this product you
    agree to comply with applicable laws and regulations. If you are unable
    to comply with U.S. and local laws, return this product immediately.
    A summary of U.S. laws governing Cisco cryptographic products may be found at:
    http://www.cisco.com/wwl/export/crypto/tool/stqrg.html
    If you require further assistance please contact us by sending email to
    [email protected].
    cisco WS-C2960S-24TS-L (PowerPC) processor (revision B0) with 131072K bytes of memory.
    Processor board ID FOC1435W6KX
    Last reset from power-on
    4 Virtual Ethernet interfaces
    1 FastEthernet interface
    28 Gigabit Ethernet interfaces
    The password-recovery mechanism is enabled.
    512K bytes of flash-simulated non-volatile configuration memory.
    Base ethernet MAC Address       : AC:A0:16:F3:EF:00
    Motherboard assembly number     : 73-11910-06
    Power supply part number        : 341-0328-01
    Motherboard serial number       : FOC14354WTE
    Power supply serial number      : LIT142210AX
    Model revision number           : B0
    Motherboard revision number     : A0
    Model number                    : WS-C2960S-24TS-L
    Daughterboard assembly number   : 73-11933-04
    Daughterboard serial number     : FOC1435437G
    System serial number            : FOC1435W6KX
    Top Assembly Part Number        : 800-30954-02
    Top Assembly Revision Number    : A0
    Version ID                      : V02
    CLEI Code Number                : COMGG00ARB
    Daughterboard revision number   : A0
    Hardware Board Revision Number  : 0x01
    Switch Ports Model              SW Version            SW Image
    *    1 28    WS-C2960S-24TS-L   12.2(53)SE2           C2960S-UNIVERSALK9-M
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    MSTswitchOVCC#

  • Speed/Duplex between two different switchs & SFP

    Hi everybody,
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    I need your help (or TAC Help ) about speed and duplex problems.
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    Dennis

    You may want to check this thread :
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