Stack Different 3750 Models

Answered Question
Mar 8th, 2010

I have 3750G-24 TS and a 3750-24TS (non-gig)

Can I stack those two different kind of models?  Never done it before and it seems it would be odd since it would be 24 gig ports and 24 FE ports.

Thoughts? Links?


I have this problem too.
0 votes
Correct Answer by Collin Clark about 6 years 10 months ago

See the second link I provided. The major version must match, but you can have minor revisions between the two. You must force the mater to push the IOS to other stack memeber it does not do it automatically.

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Overall Rating: 5 (1 ratings)
jfraasch Mon, 03/08/2010 - 09:07

How about the code? Do they run the same code?  They must, right?  Otherwise the Master switch will push the code to the provisioned switch.


Correct Answer
Collin Clark Mon, 03/08/2010 - 09:09

See the second link I provided. The major version must match, but you can have minor revisions between the two. You must force the mater to push the IOS to other stack memeber it does not do it automatically.

Jon Marshall Mon, 03/08/2010 - 09:12

Oops, sorry Collin, i was a bit too quick off the mark there. Looks like you are now faster than me in posting answers


jfraasch Mon, 03/08/2010 - 09:56

Thanks all for the help.  It's a tough one.  This is a remote site and I won't know what code will be on the 3750 before it gets plugged in.  The current master is set to priorty 15 so I should be good there. I have used these stacks quite a bit and am familiar on how to work and troubleshoot them.  I have never, however, had to plug in a different model number.  24 porters and 48 porters yes, but not 10/100 vs 10/100/1000.

Should be exciting tomorrow!


francisco_1 Mon, 03/08/2010 - 09:11

It is recommeded switches in the same stack run the same code with same feature set.  If a switch becomes the new master, that switch should support same feature set as the master or else you will have inconsistency.

switches will different cisco ios softwarer versions likely have different stack protocol versions.

switches with different major version numbers are incompatable and cannot exist in the same stack

jfraasch Wed, 03/10/2010 - 09:25

Like I said earlier, I had not chance to see what was going to be plugged in. Now that the cables are connected I am getting an error.  Here is the output.

I am getting the following error when I plug in the  stacking cables:
000081: *Nov 10 22:53:49:  %STACKMGR-6-STACK_LINK_CHANGE: Stack Port 1 Switch 1 has changed to state  UP
000082: *Nov 10 22:53:49: %STACKMGR-6-STACK_LINK_CHANGE: Stack Port 2  Switch 1 has changed to state UP
000083: *Nov 10 22:53:53:  %STACKMGR-6-SWITCH_ADDED_VM: Switch 2 has been ADDED to the stack  (VERSION_MISMATCH)
000084: *Nov 10 22:55:53:  %IMAGEMGR-6-AUTO_COPY_SW_INITIATED: Auto-copy-software process initiated for  switch number(s) 2
000085: *Nov 10 22:55:53:  %IMAGEMGR-6-AUTO_COPY_SW:
000086: *Nov 10 22:55:53: %IMAGEMGR-6-AUTO_COPY_SW:  Searching for stack member to act
000087: *Nov 10 22:55:53:  %IMAGEMGR-6-AUTO_COPY_SW: as software donor...
000088: *Nov 10 22:55:53:  %IMAGEMGR-6-AUTO_COPY_SW: Software was not copied
000089: *Nov 10 22:55:53:  %IMAGEMGR-6-AUTO_ADVISE_SW_INITIATED: Auto-advise-software process initiated for  switch number(s) 2
000090: *Nov 10 22:55:53:  %IMAGEMGR-6-AUTO_ADVISE_SW:
000091: *Nov 10 22:55:53:  %IMAGEMGR-6-AUTO_ADVISE_SW:
000092: *Nov 10 22:55:53:  %IMAGEMGR-6-AUTO_ADVISE_SW: Systems with incompatible software have
000093:  *Nov 10 22:55:53: %IMAGEMGR-6-AUTO_ADVISE_SW: been added to the stack.  The  storage
000094: *Nov 10 22:55:53: %IMAGEMGR-6-AUTO_ADVISE_SW: devices on all  of the stack members have
000095: *Nov 10 22:55:53:  %IMAGEMGR-6-AUTO_ADVISE_SW: been scanned, and the software required
000096:  *Nov 10 22:55:53: %IMAGEMGR-6-AUTO_ADVISE_SW: to make all stack members  compatible with
000097: *Nov 10 22:55:53: %IMAGEMGR-6-AUTO_ADVISE_SW: each  other was not found. The "archive
000098: *Nov 10 22:55:53:  %IMAGEMGR-6-AUTO_ADVISE_SW: download-sw" command can be used to
000099: *Nov  10 22:55:53: %IMAGEMGR-6-AUTO_ADVISE_SW: install software off of the network  from
000100: *Nov 10 22:55:53: %IMAGEMGR-6-AUTO_ADVISE_SW: a tar  file.
000101: *Nov 10 22:55:53:  %IMAGEMGR-6-AUTO_ADVISE_SW:
Here is the show version:
uprswt005#sh ver
Cisco Internetwork Operating System  Software
IOS (tm) C3750 Software (C3750-I5-M), Version 12.2(20)SE4, RELEASE  SOFTWARE (fc1)
Copyright (c) 1986-2005 by cisco Systems, Inc.
Compiled Sun  09-Jan-05 00:09 by antonino
Image text-base: 0x00003000, data-base:  0x00B81834
ROM: Bootstrap program is C3750 boot loader
BOOTLDR:  C3750 Boot Loader (C3750-HBOOT-M) Version 12.1(14r)EA1a, RELEASE SOFTWARE  (fc1)
uprswt005 uptime is 1 year, 36 weeks, 2 days, 23 hours,  0 minutes
System returned to ROM by power-on
System image file is  "flash:c3750-i5-mz.122-20.SE4/c3750-i5-mz.122-20.SE4.bin"
cisco WS-C3750G-24TS (PowerPC405) processor (revision  H0) with 118784K/12280K bytes of memory.
Processor board ID  CAT0917Y01U
Last reset from power-on
Bridging software.
7 Virtual  Ethernet/IEEE 802.3  interface(s)
56 Gigabit Ethernet/IEEE 802.3  interface(s)
The password-recovery mechanism is enabled.
512K bytes of flash-simulated non-volatile  configuration memory.
Base ethernet MAC Address       :  00:13:C4:AC:06:00
Motherboard assembly number     : 73-7058-12
Power  supply part number        : 341-0045-01
Motherboard serial number       :  CAT09170GGG
Power supply serial number      : LIT0910036Q
Model revision  number           : H0
Motherboard revision number     : A0
Model  number                    : WS-C3750G-24TS-E
System serial number             : CAT0917Y01U
Hardware Board Revision Number  : 0x09

Switch   Ports  Model              SW  Version              SW Image
------   -----  -----               ----------              ----------
*    1   28     WS-C3750G-24TS      12.2(20)SE4             C3750-I5-M
     2   0      WS-C3750-24TS       12.2(35)SE5             C3750-IPSERVICES-M

Switch 02
Switch  Uptime                   : 13 weeks, 32 minutes
Base ethernet MAC  Address       : 00:64:40:A3:C0:00
Motherboard assembly number     :  73-9677-13
Power supply part number        : 341-0034-01
Motherboard  serial number       : FDO13520051
Power supply serial number      :  DTH134310UV
Model revision number           : R0
Motherboard revision  number     : A0
Model number                    : WS-C3750-24TS-E
System  serial number            : FDO1351X2SK
Top assembly part number        :  800-26382-05
Top assembly revision number    : A0
CLEI Code  Number                : V08
Configuration register is  0xF

Am I going to have to figure out a way to download a new IOS onto the slave switch?  It is at a DR site so production right now is not impacted.



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