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Duplex problem with inline card "WAN0" again


We got duplex problem again "new site" for the inline port WAN0, LAN0 is ok.

We have tried crossover and straight through cable, without any look still 100/ half duplex.

The PTT router int fa0/0 have been to 100/full and auto/auto still 100 half in the WAE.

The WAE have been in 100/full, no link or auto/auto link but 100/half.

What can be the problem, as we have this issue with most of our 574 and 274, the 674 have have no problem at all?

Below are some output from the WAE and router.

PTT router:

#sh ver

Cisco IOS Software, 1841 Software (C1841-SPSERVICESK9-M), Version 12.4(6)T7, RELEASE SOFTWARE (fc5)

Technical Support:

Copyright (c) 1986-2007 by Cisco Systems, Inc.

Compiled Thu 29-Mar-07 03:29 by khuie

ROM: System Bootstrap, Version 12.4(13r)T, RELEASE SOFTWARE (fc1)

Router uptime is 5 weeks, 1 day, 5 minutes

System returned to ROM by power-on

System restarted at 08:09:29 GMT Sun Aug 15 2010

System image file is "flash:c1841-spservicesk9-mz.124-6.T7.bin"


Cisco 1841 (revision 7.0) with 116736K/14336K bytes of memory.

Processor board ID FCZ112411HV

2 FastEthernet interfaces

1 Serial interface

1 Serial(sync/async) interface

1 Channelized E1/PRI port

DRAM configuration is 64 bits wide with parity disabled.

191K bytes of NVRAM.

63488K bytes of ATA CompactFlash (Read/Write)

Configuration register is 0x2102

#sh int fa0/0

FastEthernet0/0 is up, line protocol is up

  Hardware is Gt96k FE, address is 001b.d5ab.3fc8 (bia 001b.d5ab.3fc8)

  Internet address is

  MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,

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

  Encapsulation ARPA, loopback not set

  Keepalive set (10 sec)

  Half-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 never

  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0

  Queueing strategy: fifo

  Output queue: 0/40 (size/max)

  5 minute input rate 103000 bits/sec, 89 packets/sec

  5 minute output rate 625000 bits/sec, 93 packets/sec

     110094543 packets input, 2604076581 bytes

     Received 10013739 broadcasts, 0 runts, 0 giants, 0 throttles

     21 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored

     0 watchdog

     0 input packets with dribble condition detected

     110416771 packets output, 4153304953 bytes, 0 underruns

     149371 output errors, 113762 collisions, 149376 interface resets

     0 babbles, 149940 late collision, 0 deferred

     0 lost carrier, 0 no carrier

     0 output buffer failures, 0 output buffers swapped out


From the WAE:

#sh interface inlineport  InlineGroup 1/0/wan
% Invalid input detected at '^' marker.
ZAJOPWAAS01#sh interface inlineport  1/0/wan
Device name        : eth4. Bypass master interface.
Packets Received   : 59466951
Packets Intercepted: 50007028
Packets Bridged    : 10002103
Packets Forwarded  : 44722188
Packets Dropped    : 69
Packets Received on native      : 0
Active flows for this interface : 0

Ethernet Driver Status
Ethernet address:00:E0:ED:11:E5:A8
Maximum Transfer Unit Size:1500
Packets Received: 59466909
Input Errors: 0
Input Packets Dropped: 0
Input Packets Overruns: 0
Input Packets Frames: 0
Packet Sent: 64238956
Output Errors: 116996
Output Packets Dropped: 0
Output Packets Overruns: 0
Output Packets Carrier: 116996
Output Queue Length:100
Collisions: 182840
Base address:0x5000
Link State: Interface is up,line protocol up
Mode: autoselect, half-duplex, 100baseTX

1#sh ver
Cisco Wide Area Application Services Software (WAAS)
Copyright (c) 1999-2010 by Cisco Systems, Inc.
Cisco Wide Area Application Services (WAAS-UNIVERSAL-K9) Software Release 4.2.1
(build b38 Jun 16 2010)
Version: oe574-

Compiled 20:44:26 Jun 16 2010 by damaster

Device Id: 00:26:55:ad:cd:04
System was restarted on Mon Aug 30 16:48:52 2010.
The system has been up for 2 weeks, 6 days, 17 hours, 52 minutes, 10 seconds.

Jan Rockstedt

Cisco Employee

Re: Duplex problem with inline card "WAN0" again

Hi Jan,

If you are connecting Router to WAN0_0 port, you should use cross-over cable under most of the circumstances and unless you are using all gig interfaces on both sides. This will avoid any hardware limitations due to non-Auto-MDIX supported hardware.

Cisco strongly recommend that you do not use half-duplex connections on the WAE or on routers, switches, or other devices.

You will find more information here: Cabling

Further, there is a possibility that the interface on Router / WAE inline adapater / cable might be bad. I would suggest following in that case.

1. Using a new cross-over / stright cable. if the issue continues, proble lies on the interface sides.

2. Using a different port on router. if the issue continues, problem is with WAN0_0 port of WAE.

3. Try connecting wan0_0 port to another switch / router to see if it negotiates at full duplex. If it still continues at half duplex, there is an issue with WAN0_0 port most probably.

4. Try connecting secondary gig port or WAN0_1 port to same router interface. If the issue continues, problem may be with router FA0/0 interface.

If you find that issue is with either router / WAE inline interface, please open a TAC case for RMA.

Hope this helps.


PS: If this resolves your issue, please mark this as Answered.

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