Cisco Support Community
Showing results for 
Search instead for 
Did you mean: 

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. And see here for current known issues.

New Member

VSS for Cat6506E and Cat3750 stack issue

Since my client is using some Cat3750 stack in their campus, and experienced loop several times . now we have 2 new core Cat6506E, we want to use VSS, if the VSS is stable enough ?

What is the cause for the Cat3750 stack loop ?


Cat3750 info:


------------------ show version ------------------

Cisco IOS Software, C3750 Software (C3750-IPSERVICESK9-M), Version 12.2(55)SE4, RELEASE SOFTWARE (fc1)
Technical Support:
Copyright (c) 1986-2011 by Cisco Systems, Inc.
Compiled Tue 06-Sep-11 02:59 by prod_rel_team
Image text-base: 0x01000000, data-base: 0x02F00000

ROM: Bootstrap program is C3750 boot loader
BOOTLDR: C3750 Boot Loader (C3750-HBOOT-M) Version 12.2(44)SE5, RELEASE SOFTWARE (fc1)

M01SW3750-01 uptime is 4 weeks, 6 days, 23 hours, 2 minutes
System returned to ROM by power-on
System image file is "flash:c3750-ipservicesk9-mz.122-55.SE4.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:

If you require further assistance please contact us by sending email to

cisco WS-C3750-24P (PowerPC405) processor (revision J0) with 131072K bytes of memory.
Processor board ID CAT1110NGVJ
Last reset from power-on
9 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       : 00:1B:2B:59:D0:80
Motherboard assembly number     : 73-9672-09
Power supply part number        : 341-0029-05
Motherboard serial number       : CAT111051SG
Power supply serial number      : LIT11060B5D
Model revision number           : J0
Motherboard revision number     : A0
Model number                    : WS-C3750-24PS-S
System serial number            : CAT1110NGVJ
Top Assembly Part Number        : 800-25860-04
Top Assembly Revision Number    : B0
Version ID                      : V05
CLEI Code Number                : CNMV1K0CRD
Hardware Board Revision Number  : 0x01

Switch Ports Model              SW Version            SW Image                 
------ ----- -----              ----------            ----------               
*    1 26    WS-C3750-24P       12.2(55)SE4           C3750-IPSERVICESK9-M     

Configuration register is 0xF

Super Bronze

DisclaimerThe Author of this


The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.

Liability Disclaimer

In no event shall Author be liable for any damages whatsoever (including, without limitation, damages for loss of use, data or profit) arising out of the use or inability to use the posting's information even if Author has been advised of the possibility of such damage.


You have a "stack loop"?  If so, sound like you should contact TAC although would recommend you upgrade your 55SE4 to 55SE8.


VSS is now relatively stable, at least on the VS-S720s.

CreatePlease login to create content