09-22-2004 02:19 AM - edited 03-02-2019 06:40 PM
I have this seniorio
2600 FE0/0----Aperto-------Wireless Link---E0/1 3600
All interfaces are Fullduplex but still getting
on 2600
%CDP-4-DUPLEX_MISMATCH: duplex mismatch discovered on FastEthernet0/0 (not half duplex), with 3640 Ethernet0/1 (half duplex).
On 3600
%CDP-4-DUPLEX_MISMATCH: duplex mismatch discovered on Ethernet0/1 (not full duplex), with 2600 FastEthernet0/0 (full duplex).
09-22-2004 03:14 AM
It would seem that your 3600 is configured half-duplex. Alternatively, it might be configured auto and the wireless link kit is not negotiating. With the wireless link, you will probably have to force the duplex on both sides. Of course, you will have to set it according to the capabilities of the wireless link.
Kevin Dorrell
Luxembourg
09-22-2004 09:22 PM
Ok thanks but configrution at both ends is FDX
Regards
09-22-2004 11:37 PM
That may be configured, but the CDP is telling you a different story. So either the CDP is lying, or the interfaces are not doing what is configured.
Let's look at your messages:
On 2600: %CDP-4-DUPLEX_MISMATCH: duplex mismatch discovered on FastEthernet0/0 (not half duplex), with 3640 Ethernet0/1 (half duplex). This seems to be saying that the 3640 is running half-duplex on E0/1.
On 3600 : %CDP-4-DUPLEX_MISMATCH: duplex mismatch discovered on Ethernet0/1 (not full duplex), with 2600 FastEthernet0/0 (full duplex). This also seems to be saying that the 3640 is running half-duplex.
Please could you post the "show int E0/1" and the "show run int E0/1" from the 3640.
What module are you using for the Ethernet? Is it an NM-4E or is it an NM-2E2W? The NM-2E2W supports full-duplex only from IOS 12.0(4)T onwards. Could this be the problem? What version are you running? See:
http://www.cisco.com/warp/public/107/nm-e2w.shtml
Kevin Dorrell
Luxembourg
09-22-2004 11:51 PM
Thanks for reply This is NM2E2W but IOS is 12.2(1),
Pls see
Cisco Internetwork Operating System Software
IOS (tm) 3600 Software (C3640-IS-M), Version 12.2(1), RELEASE SOFTWARE (fc2)
Copyright (c) 1986-2001 by cisco Systems, Inc.
Compiled Fri 27-Apr-01 03:19 by cmong
Image text-base: 0x60008950, data-base: 0x61156000
ROM: System Bootstrap, Version 11.1(19)AA, EARLY DEPLOYMENT RELEASE SOFTWARE (fc1)
3640 uptime is 3 days, 2 hours, 55 minutes
System returned to ROM by power-on
System restarted at 00:44:00 PST Mon Mar 8 1993
System image file is "flash:c3640-is-mz.122-1.bin"
cisco 3640 (R4700) processor (revision 0x00) with 61440K/4096K bytes of memory.
Processor board ID 11877871
R4700 CPU at 100Mhz, Implementation 33, Rev 1.0
Bridging software.
X.25 software, Version 3.0.0.
SuperLAT software (copyright 1990 by Meridian Technology Corp).
2 Ethernet/IEEE 802.3 interface(s)
4 Serial network interface(s)
8 Low-speed serial(sync/async) network interface(s)
DRAM configuration is 64 bits wide with parity disabled.
125K bytes of non-volatile configuration memory.
16384K bytes of processor board System flash (Read/Write)
Configuration register is 0x2102
interface Ethernet0/1
description ***Khi_***Aperto Wireless Bridge***
ip address 145.17.63.242 255.255.255.252
ip ospf cost 400
load-interval 30
full-duplex
!
09-23-2004 12:07 AM
OK, that eliminates the IOS as the culprit. And I do see that full-duplex is configured. Please could you do a "show int E0/1"? And also a "show cdp neighbor E0/1 detail"?
Thanks.
Kevin Dorrell
Luxembourg
09-23-2004 12:09 AM
sh int e0/1
Ethernet0/1 is up, line protocol is up
Hardware is AmdP2, address is 0050.7343.dec2 (bia 0050.7343.dec2)
Description: ***Khi_DRP-AMZ***Aperto Wireless Bridge***
Internet address is 145.17.63.242/30
MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
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
Queueing strategy: fifo
Output queue 0/40, 0 drops; input queue 0/75, 0 drops
30 second input rate 17000 bits/sec, 6 packets/sec
30 second output rate 8000 bits/sec, 7 packets/sec
1084017 packets input, 681491984 bytes, 0 no buffer
Received 49813 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
1112731 packets output, 163192486 bytes, 0 underruns(0/0/0)
8 output errors, 0 collisions, 5 interface resets
0 babbles, 0 late collision, 0 deferred
8 lost carrier, 0 no carrier
0 output buffer failures, 0 output buffers swapped out
09-23-2004 12:43 AM
It's strange it does not specify the duplex. Normally I would expect to see that between the "Keepalive" line and the "ARP" line. However, I see that there have been no collisions at all, so I can believe it really is full duplex.
It is beginning to look as if the CDP is lying. What do you get for "show cdp neighbor E0/1" ?
Kevin Dorrell
Luxembourg
09-23-2004 12:56 AM
Pls see
2600#sh cdp neighbors detail
-------------------------
Device ID: 3640
Entry address(es):
IP address: 145.17.63.242
Platform: cisco 3640, Capabilities: Router
Interface: FastEthernet0/0, Port ID (outgoing port): Ethernet0/1
Holdtime : 133 sec
Version :
Cisco Internetwork Operating System Software
IOS (tm) 3600 Software (C3640-IS-M), Version 12.2(1), RELEASE SOFTWARE (fc2)
Copyright (c) 1986-2001 by cisco Systems, Inc.
Compiled Fri 27-Apr-01 03:19 by cmong
advertisement version: 2
Duplex: half
===========================================================================
3640#sh cdp neighbors detail
-------------------------
Device ID: 2600
Entry address(es):
IP address: 145.17.63.241
Platform: cisco 2651XM, Capabilities: Router Switch
Interface: Ethernet0/1, Port ID (outgoing port): FastEthernet0/0
Holdtime : 165 sec
Version :
Cisco Internetwork Operating System Software
IOS (tm) C2600 Software (C2600-IS-M), Version 12.2(11)T3, RELEASE SOFTWARE
(fc2)
TAC Support: http://www.cisco.com/tac
Copyright (c) 1986-2002 by cisco Systems, Inc.
Compiled Sun 22-Dec-02 07:28 by ccai
advertisement version: 2
VTP Management Domain: ''
Duplex: full
Note in 3600 default speed is auto and I saw somewhere that we cannot change default Half duplex unless speed is non auto More I cannot change speed on this ethernet'
09-23-2004 01:33 AM
Speed and duplex negotiation works on FastEthernet interfaces. Normal 'E' interfaces are fixed at 10 Mbps, so there is no negotiation, i.e. no "auto". On an 'E' interface, the default (in fact the only option) is fixed 10 Mbps. Only the duplex can be changed, if the IOS permits.
The CDP seems to be convinced that it is half-duplex. But the collisions=0 tells me it is full- duplex. This looks to me like a bug in the CDP, but I couldn't find any reference to it in the bug database. I think you should raise a TAC case through your support channel.
Sorry I cannot solve it for you.
Kevin Dorrell
Luxembourg.
09-23-2004 05:44 PM
On the 3600 try this command and check the duplex setting on line 9 of the output:
show controllers ethernet 0/1
You might find that your Full Duplex configuration command is being ignored.
Regards
09-23-2004 10:44 PM
Thanks for reply
sh contr e0/1
Interface Ethernet0/1
Hardware is AMD Presidio2
ADDR: 61E6DE98, FASTSEND: 6002C048, MCI_INDEX: 0
DIST ROUTE ENABLED: 0
Route Cache Flag: 1
LADRF=0x0080 0x0000 0x0002 0x0000
CSR0 =0x00000072, CSR3 =0x00001044, CSR4 =0x0000491D, CSR15 =0x00000000
CSR80 =0x0000D900, CSR114=0x00000000, CRDA =0x03D3F2E0, CXDA =0x03D3F840
----------------------------------
BCR9 =0x00000001 (full-duplex)
----------------------------------
HW filtering information:
Promiscuous Mode Disabled, PHY Addr Enabled, Broadcast Addr Enabled
09-26-2004 12:31 PM
Oh well. That's all I can think of.
I would say this is confirmation that the port is indeed operating in FDX mode.
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