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

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    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:/ #

  • 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.

  • ASA5510 duplex mismatch

    I have an ASA5510 (7.2(4)) with outside interface conn to ISP's Cisco 2610 (10M Ethernet - NOT FASTETHERNET).
    Previously a PIX506E was attached to same router. PIX outside was set 'interface ethernet0 10full' and the router's E0/0 was hard set 'full-duplex'.
    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.
    Any suggestions from the Cisco community?
    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.  
    At no time whatsoever is there any duplex mismatch errors.
    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.
    Any ideas on why this port keeps jumping into half duplex operation?   I really need this port to run in full duplex and cannot understand why the port would go into half duplex operation when the end devices should support full duplex.
    Again, i never get any duplex mismatch errors.
    I appreciate any troubleshooting tips you can provide.

    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
    Configuration register is 0xF
    MSTswitchOVCC#

  • %CDP-4-DUPLEX_MISMATCH (IP-phone)

    Hi! I'm getting this error on an access switch.
    %CDP-4-DUPLEX_MISMATCH: duplex mismatch discovered on FastEthernet0/9 (not half duplex), with SEP00141C8Dxxxx Port 1 (half duplex).
    Why is the phone port 1 half duplex? Shouldn't the phones be configured as auto-negotiation as default?
    Could it be a cabling issue?
    Will it affect the throughput / performance on that port?
    This is happening with some of my other phones + switches.

    Hi
    First thing to check is whether the phone has been configured for half duplex - this is a setting configured from the phone itself (via the keypad). You can go into 'settings', then 'network configuration' and scroll down until you see the 'PC' and 'SW' port configurations.
    If you are not near the phone you can browse to the phone IP with Internet Explorer and then click 'Network Configuration' on the left. Somewhere in that list should be the configured speed/duplex settings.
    If it is configured for auto/auto, then I would check that there are not multiple devices on the affected switch port - for example someone may have inserted a hub or other intermediate device.
    Aaron
    Please rate helpful posts...

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