12-13-2013 08:00 AM - edited 03-07-2019 05:04 PM
Hello I am seeing a strange issue.
hope to get a little bit of advice on this.
There are two switches connected WS-C3560-48PS-S on one side and WS-C2960-24PC-S on the other side.
the interface configurations are as follows:
WS-C3560-48PS-S
interface FastEthernet0/48
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 101,350
switchport mode trunk
bandwidth 1024
load-interval 30
end
WS-C2960-24PC-S
interface FastEthernet0/24
switchport mode trunk
load-interval 30
duplex full
end
the problem is, the moment i am setting the fa 0/48 on the 3560 switch as a full duplex the interface goes down / down.
the moment i put it back to auto it comes up but the negotiation comes as half duplex and causes duplex mismatch.
Any pointers to fix this ?
many thanks in advance.
Solved! Go to Solution.
12-16-2013 02:44 AM
Upgrade the IOS of your 3560 to a minimum of 12.2(55)SE7. Go to SE8 if possible.
The IOS your 3560 is using is very buggy. This could explain why the 3560 link to the 2960 is at full capacity since it's negotiated to half-duplex and it's pushing traffic at half speed.
12-13-2013 08:04 AM
Have you tried setting both the speed and the duplex manually?
Replaced the cable between them?
12-13-2013 09:22 AM
It's probably working as designed. Someone probably used a straight thru cable between them and auto mdix is correcting the cabling , as auto mdix only works when the settings are auto for speed and duplex . When you try to hardcode the speed and duplex the switch will take down the line as it is designed. You don't need to hardcode the speed and duplex . Set the 2960 side to duplex auto and leave the 3560 side as auto/auto . If you absolutely feel you have to hardcode then you will have to replace the cable with the correct crossover cable .
12-13-2013 10:08 AM
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I agree with Glen, likely auto is allowing auto-MDI, which will work with straight through or cross over cable.
As far as auto on 3560, with full on the 2960, then yes, auto will assume half duplex. As Glen also suggests, recommend auto/auto both sides.
12-13-2013 04:07 PM
Glen,
Shouldn't MDI-X be working on the 3560 since the port is set to auto/auto? I understand MDI-X is disabled in 2960 due to the duplex being hardcoded.
12-14-2013 12:46 PM
I think he said is was working auto auto but duplex was mismatched which it would be because the 2960 is hardcaoded full and it then went down when he hardcoded the 3560 side.
12-13-2013 04:10 PM
If setting the duplex and speed to auto (both switches) don't work, we may need to run a TDR from the 2960.
If we have to do this, can you please specify if the GigabitEthernet (copper) ports of the 2960 is being used or not. If it's not then we can do a four-pair TDR test. Otherwise, the FastEthernet port of the 2960 can only test two pairs.
12-16-2013 01:50 AM
Thanks a lot all for your replies and your views on this.
I changed the Settings on both sides to speed auto and duplex auto and it negotiates to half as shown below.
2960 Swtich
Fa0/24 connected trunk a-half a-100 10/100BaseTX
3560 Switch
Fa0/48 connected trunk a-half a-100 10/100BaseTX
It is really strange as with auto on both sides it should not negotiate to half?
thanks again and look forward to your thoughts.
12-16-2013 01:53 AM
Post the output to the command "sh interface
Next post the "sh version" of both switches.
12-16-2013 01:58 AM
***** 2960 ******
Switch#sh int fa 0/24
FastEthernet0/24 is up, line protocol is up (connected)
Hardware is Fast Ethernet, address is d0c7.8976.1918 (bia d0c7.8976.1918)
MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,
reliability 255/255, txload 1/255, rxload 2/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Half-duplex, 100Mb/s, media type is 10/100BaseTX
input flow-control is off, output flow-control is unsupported
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:00, output 00:00:01, 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)
30 second input rate 1093000 bits/sec, 174 packets/sec
30 second output rate 265000 bits/sec, 191 packets/sec
45456081 packets input, 33875483713 bytes, 0 no buffer
Received 290994 broadcasts (252535 multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 252535 multicast, 0 pause input
0 input packets with dribble condition detected
48320984 packets output, 13455690999 bytes, 0 underruns
0 output errors, 185 collisions, 1 interface resets
0 babbles, 201 late collision, 0 deferred
0 lost carrier, 0 no carrier, 0 PAUSE output
0 output buffer failures, 0 output buffers swapped out
Switch#
Switch#sh run int fa 0/24
Building configuration...
Current configuration : 75 bytes
!
interface FastEthernet0/24
switchport mode trunk
load-interval 30
end
Switch#
--------------------------------------------------
***** 3560 *****
sh run int fa 0/48
Building configuration...
Current configuration : 209 bytes
!
interface FastEthernet0/48
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 101,350
switchport mode trunk
bandwidth 1024
load-interval 30
end
sh int fa 0/48
FastEthernet0/48 is up, line protocol is up (connected)
Hardware is Fast Ethernet, address is 001e.13aa.8bb4 (bia 001e.13aa.8bb4)
MTU 1500 bytes, BW 1024 Kbit, DLY 100 usec,
reliability 255/255, txload 245/255, rxload 79/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Half-duplex, 100Mb/s, media type is 10/100BaseTX
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: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
30 second input rate 320000 bits/sec, 179 packets/sec
30 second output rate 986000 bits/sec, 166 packets/sec
1004372639 packets input, 290931054004 bytes, 0 no buffer
Received 39107314 broadcasts (26915990 multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 26915990 multicast, 0 pause input
0 input packets with dribble condition detected
971148257 packets output, 780705586557 bytes, 0 underruns
0 output errors, 1599712 collisions, 0 interface resets
0 babbles, 9441908 late collision, 0 deferred
0 lost carrier, 0 no carrier, 0 PAUSE output
0 output buffer failures, 0 output buffers swapped out
12-16-2013 02:04 AM
***** 3560 Sh ver *****
sh ver
Cisco IOS Software, C3560 Software (C3560-IPSERVICESK9-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 05:33 by prod_rel_team
Image text-base: 0x01000000, data-base: 0x02E00000
ROM: Bootstrap program is C3560 boot loader
BOOTLDR: C3560 Boot Loader (C3560-HBOOT-M) Version 12.2(44)SE5, RELEASE SOFTWARE (fc1)
Switch uptime is 10 weeks, 2 days, 23 hours, 17 minutes
System returned to ROM by power-on
System image file is "flash:c3560-ipservicesk9-mz.122-53.SE2/c3560-ipservicesk9-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
cisco WS-C3560-48PS (PowerPC405) processor (revision N0) with 131072K bytes of memory.
Processor board ID CAT1020N055
Last reset from power-on
2 Virtual Ethernet interfaces
48 FastEthernet interfaces
4 Gigabit Ethernet interfaces
The password-recovery mechanism is enabled.
512K bytes of flash-simulated non-volatile configuration memory.
Base ethernet MAC Address : 00:1E:13:AA:8B:80
Motherboard assembly number : 73-9676-12
Power supply part number : 341-0029-05
Motherboard serial number : CAT10256D36
Power supply serial number : LIT11337DCM
Model revision number : N0
Motherboard revision number : B0
Model number : WS-C3560-48PS-S
System serial number : CAT1020N055
SFP Module assembly part number : 73-7757-03
SFP Module revision Number : A0
SFP Module serial number : CAT10243H19
Top Assembly Part Number : 800-25859-03
Top Assembly Revision Number : J0
Version ID : V04
CLEI Code Number : CNMV3N0CRC
Hardware Board Revision Number : 0x01
Switch Ports Model SW Version SW Image
------ ----- ----- ---------- ----------
* 1 52 WS-C3560-48PS 12.2(53)SE2 C3560-IPSERVICESK9-M
Configuration register is 0xF
***** 2960 Sh ver *****
Switch#sh version
Cisco IOS Software, C2960 Software (C2960-LANLITEK9-M), Version 12.2(55)SE7, RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2013 by Cisco Systems, Inc.
Compiled Mon 28-Jan-13 10:22 by prod_rel_team
Image text-base: 0x00003000, data-base: 0x01400000
ROM: Bootstrap program is C2960 boot loader
BOOTLDR: C2960 Boot Loader (C2960-HBOOT-M) Version 12.2(53r)SEY3, RELEASE SOFTWARE (fc1)
Switch uptime is 2 days, 19 hours, 15 minutes
System returned to ROM by power-on
System image file is "flash:/c2960-lanlitek9-mz.122-55.SE7/c2960-lanlitek9-mz.122-55.SE7.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
cisco WS-C2960-24PC-S (PowerPC405) processor (revision K0) with 65536K bytes of memory.
Processor board ID FCQ1719Y3Y4
Last reset from power-on
2 Virtual Ethernet interfaces
24 FastEthernet interfaces
2 Gigabit Ethernet interfaces
The password-recovery mechanism is enabled.
64K bytes of flash-simulated non-volatile configuration memory.
Base ethernet MAC Address : D0:C7:89:76:19:00
Motherboard assembly number : 73-12784-05
Power supply part number : 341-0266-03
Motherboard serial number : FCQ17190CKN
Power supply serial number : DCA1713H07L
Model revision number : K0
Motherboard revision number : A0
Model number : WS-C2960-24PC-S
System serial number : FCQ1719Y3Y4
Top Assembly Part Number : 800-33168-02
Top Assembly Revision Number : A0
Version ID : V06
CLEI Code Number : COMK400DRD
Hardware Board Revision Number : 0x02
Switch Ports Model SW Version SW Image
------ ----- ----- ---------- ----------
* 1 26 WS-C2960-24PC-S 12.2(55)SE7 C2960-LANLITEK9-M
Configuration register is 0xF
12-16-2013 02:44 AM
Upgrade the IOS of your 3560 to a minimum of 12.2(55)SE7. Go to SE8 if possible.
The IOS your 3560 is using is very buggy. This could explain why the 3560 link to the 2960 is at full capacity since it's negotiated to half-duplex and it's pushing traffic at half speed.
12-16-2013 02:50 AM
Thanks Leo;
i will give it a try.
12-16-2013 02:56 AM
Thank you very much for taking the time to rate our posts, Kaushik.
Let us know how you go.
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