sh int gi0/22

GigabitEthernet0/22 is up, line protocol is up (connected)

  Hardware is Gigabit Ethernet, address is 0023.052b.a096 (bia 0023.052b.a096)

  MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,

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

  Encapsulation ARPA, loopback not set

  Keepalive not set

  Full-duplex, 1000Mb/s, link type is auto, media type is 1000BaseLX SFP

  input flow-control is off, output flow-control is unsupported

  ARP type: ARPA, ARP Timeout 04:00:00

  Last input 00:00:09, 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 0 bits/sec, 0 packets/sec

  5 minute output rate 108000 bits/sec, 64 packets/sec

     112643 packets input, 51674930 bytes, 0 no buffer

     Received 54673 broadcasts (0 multicasts)

     0 runts, 0 giants, 0 throttles

     1 input errors, 1 CRC, 0 frame, 0 overrun, 0 ignored

     0 watchdog, 54638 multicast, 0 pause input

     0 input packets with dribble condition detected

     56007230 packets output, 26626201288 bytes, 0 underruns

     0 output errors, 0 collisions, 5 interface resets

     0 babbles, 0 late collision, 0 deferred

     0 lost carrier, 0 no carrier, 0 PAUSE output

     0 output buffer failures, 0 output buffers swapped out

-------------------------------------------------------------------------------------------------

sh int gi1/0/25                          
GigabitEthernet1/0/25 is down, line protocol is down (notconnect)                                                                
  Hardware is Gigabit Ethernet, address is 2893.fe02.5119 (bia 2893.fe02.5119)                                                                             
  MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,                                              
     reliability 255/255, txload 1/255, rxload 1/255                                                   
  Encapsulation ARPA, loopback not set                                     
  Keepalive not set                  
  Auto-duplex, Auto-speed, link type is auto, media type is 1000BaseLX SFP
  input flow-control is off, output flow-control is unsupported
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input 21:19:20, output 21:19:20, 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 0 bits/sec, 0 packets/sec
  5 minute output rate 0 bits/sec, 0 packets/sec
     21 packets input, 2890 bytes, 0 no buffer
     Received 21 broadcasts (0 multicasts)
     0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 21 multicast, 0 pause input
     0 input packets with dribble condition detected
     22 packets output, 3480 bytes, 0 underruns
     0 output errors, 0 collisions, 1 interface resets
     0 babbles, 0 late collision, 0 deferred
     0 lost carrier, 0 no carrier, 0 PAUSE output
     0 output buffer failures, 0 output buffers swapped out

And this is the same on all 4 SFP ports of the 3750?

Hello,

Are you using the same SFP on both switches i.e. are you moving the SFP from the 2960 to 3750? If not, can you please try that. It could be a bad SFP issue. Also, if you are going via a patch panel for 3750, can you try bypassing the patch panel and see if that helps?

Regards,

NT

Hi

There is no intermediate patching all connections are direct, same SFP is being used and has been tested in all ports.

Keith

Can you give us the make/model of the SFP?

Also, provide "show run int gi1/0/25" from the 3750, and "show run int gi0/22" of the 2960. Also provide "show ver" for both switches.

Thanks,

Tim

interface GigabitEthernet1/0/25
switchport trunk encapsulation dot1q
switchport mode trunk
end

interface GigabitEthernet0/22
switchport mode trunk
end

#sh ver
Cisco IOS Software, C2960 Software (C2960-LANBASE-M), Version 12.2(35)SE5, RELEASE SOFTWARE (fc1)
Copyright (c) 1986-2007 by Cisco Systems, Inc.
Compiled Thu 19-Jul-07 20:06 by nachen
Image text-base: 0x00003000, data-base: 0x00D40000

ROM: Bootstrap program is C2960 boot loader
BOOTLDR: C2960 Boot Loader (C2960-HBOOT-M) Version 12.2(25r)SEE1, RELEASE SOFTWARE (fc1)

HC-HQ01-63 uptime is 35 weeks, 3 days, 20 hours, 30 minutes
System returned to ROM by power-on
System restarted at 13:21:43 UTC Sun Nov 29 2009
System image file is "flash:c2960-lanbase-mz.122-35.SE5/c2960-lanbase-mz.122-35.SE5.bin"

cisco WS-C2960G-24TC-L (PowerPC405) processor (revision E0) with 61440K/4088K bytes of memory.
Processor board ID FOC1233Y6P8
Last reset from power-on
1 Virtual Ethernet interface
24 Gigabit Ethernet interfaces
The password-recovery mechanism is enabled.

64K bytes of flash-simulated non-volatile configuration memory.
Base ethernet MAC Address       : 00:23:05:2B:A0:80
Motherboard assembly number     : 73-10015-06
Power supply part number        : 341-0098-02
Motherboard serial number       : FOC12335ZJ3
Power supply serial number      : AZS1230150B
Model revision number           : E0
Motherboard revision number     : A0
Model number                    : WS-C2960G-24TC-L
System serial number            : FOC1233Y6P8
Top Assembly Part Number        : 800-26673-03
Top Assembly Revision Number    : B0
Version ID                      : V03
CLEI Code Number                : COM3G00BRB
Hardware Board Revision Number  : 0x01

Switch   Ports  Model              SW Version              SW Image
------   -----  -----              ----------              ----------
*    1   24     WS-C2960G-24TC-L   12.2(35)SE5             C2960-LANBASE-M

Configuration register is 0xF

Cisco IOS Software, C3750 Software (C3750-IPSERVICES-M), Version 12.2(35)SE5, RELEASE SOFTWARE (fc1)
Copyright (c) 1986-2007 by Cisco Systems, Inc.
Compiled Thu 19-Jul-07 19:15 by nachen
Image text-base: 0x00003000, data-base: 0x01280000

ROM: Bootstrap program is C3750 boot loader
BOOTLDR: C3750 Boot Loader (C3750-HBOOT-M) Version 12.2(25r)SEE4, RELEASE SOFTWARE (fc1)

HC-INV10-01 uptime is 2 weeks, 1 day, 17 hours, 55 minutes
System returned to ROM by power-on
System image file is "flash:c3750-ipservices-mz.122-35.SE5/c3750-ipservices-mz.122-35.SE5.bin"

cisco WS-C3750G-24TS-1U (PowerPC405) processor (revision F0) with 118784K/12280K bytes of memory.
Processor board ID FOC1412Y4DD
Last reset from power-on
4 Virtual Ethernet interfaces
56 Gigabit Ethernet interfaces
The password-recovery mechanism is enabled.

512K bytes of flash-simulated non-volatile configuration memory.
Base ethernet MAC Address       : 28:93:FE:02:51:00
Motherboard assembly number     : 73-10219-07
Power supply part number        : 341-0098-02
Motherboard serial number       : FOC14114ZRC
Power supply serial number      : AZS14080139
Model revision number           : F0
Motherboard revision number     : F0
Model number                    : WS-C3750G-24TS-E1U
System serial number            : FOC1412Y4DD
Top Assembly Part Number        : 800-27484-01
Top Assembly Revision Number    : F0
Version ID                      : V03
CLEI Code Number                : CNMWZ00ARC
Hardware Board Revision Number  : 0x09

Switch   Ports  Model              SW Version              SW Image
------   -----  -----              ----------              ----------
*    1   28     WS-C3750G-24TS-1U  12.2(35)SE5             C3750-IPSERVICES-M
     2   28     WS-C3750G-24TS-1U  12.2(35)SE5             C3750-IPSERVICES-M

Switch 02
---------
Switch Uptime                   : 2 weeks, 1 day, 17 hours, 54 minutes
Base ethernet MAC Address       : FC:FB:FB:6D:EC:80
Motherboard assembly number     : 73-10219-07
Power supply part number        : 341-0098-02
Motherboard serial number       : FOC14124W74
Power supply serial number      : AZS141217YZ
Model revision number           : F0
Motherboard revision number     : F0
Model number                    : WS-C3750G-24TS-E1U
System serial number            : FOC1412Y4HA
Top assembly part number        : 800-27484-01
Top assembly revision number    : F0
Version ID                      : V03
CLEI Code Number                : CNMWZ00ARC

Configuration register is 0xF

SFP model

Keith

Hi all

Hopefully this will be useful to someone else but the issue i was having was based around each negotiating a different speed.  In the Gig interface on the 3750 i executed the "speed nonegotiate" command.  This solved the issue.