Hi
i have 4500x running VSS last year stable enough i have to say , there acting as our campus dist , im running 3.8.7 , i used on mode for the peer link i do remember having negotiation issues with lacp/pgap , check your below outputs are similar to mine
xxxxxxxxx#sh ver | i 4500e
Cisco IOS Software, IOS-XE Software, Catalyst 4500 L3 Switch Software (cat4500e-UNIVERSALK9-M), Version 03.08.07.E RELEASE SOFTWARE (fc2)
System image file is "bootflash:cat4500e-universalk9.SPA.03.08.07.E.152-4.E7.bin"`
sh switch virtual
Executing the command on VSS member switch role = VSS Active, id = 1
Switch mode : Virtual Switch
Virtual switch domain number : 200
Local switch number : 1
Local switch operational role: Virtual Switch Active
Peer switch number : 2
Peer switch operational role : Virtual Switch Standby
Executing the command on VSS member switch role = VSS Standby, id = 2
Switch mode : Virtual Switch
Virtual switch domain number : 200
Local switch number : 2
Local switch operational role: Virtual Switch Standby
Peer switch number : 1
Peer switch operational role : Virtual Switch Active
#show switch virtual redundancy
Executing the command on VSS member switch role = VSS Active, id = 1
My Switch Id = 1
Peer Switch Id = 2
Last switchover reason = none
Configured Redundancy Mode = Stateful Switchover
Operating Redundancy Mode = Stateful Switchover
Switch 1 Slot 1 Processor Information :
-----------------------------------------------
Current Software state = ACTIVE
Image Version = Cisco IOS Software, Catalyst 4500 L3 Switch Software (cat4500e-UNIVERSALK9-M), Version 15.2(4)E7, RELEASE SOFTWARE (fc2)
Technical Support:
http://www.cisco.com/techsupportCopyright (c) 1986-2018 by Cisco Systems, Inc.
Compiled Tue 18-Sep-18 17:28 by prod_rel_team
BOOT = bootflash:cat4500e-universalk9.SPA.03.08.07.E.152-4.E7.bin,1;bootflash:cat4500e-universalk9.SPA.03.06.07.E.152-2.E7.bin,1;
Configuration register = 0x2102
Fabric State = ACTIVE
Control Plane State = ACTIVE
Switch 2 Slot 1 Processor Information :
-----------------------------------------------
Current Software state = STANDBY HOT (switchover target)
Image Version = Cisco IOS Software, Catalyst 4500 L3 Switch Software (cat4500e-UNIVERSALK9-M), Version 15.2(4)E7, RELEASE SOFTWARE (fc2)
Technical Support:
http://www.cisco.com/techsupportCopyright (c) 1986-2018 by Cisco Systems, Inc.
Compiled Tue 18-Sep-18 17:28 by pr
BOOT = bootflash:cat4500e-universalk9.SPA.03.08.07.E.152-4.E7.bin,1;bootflash:cat4500e-universalk9.SPA.03.06.07.E.152-2.E7.bin,1;
Configuration register = 0x2102
Fabric State = ACTIVE
Control Plane State = STANDBY
Executing the command on VSS member switch role = VSS Standby, id = 2