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Catalyst 4500 Series Switch, Cisco IOS Software Configuration Guide - Cisco IOS XE 3.9.xE and IOS 15.2(5)Ex
 
Chapter 5      Configuring Virtual Switching Systems
License Upgrade on a VSS
3         ISSU RF                  Base
4         ISSU CF client           Base
5         ISSU Network RF client   Base
...
...
7200      ISSU Archive Client      Non-Base
7201      ISSU Rollback Client     Non-Base
7203      ISSU Shell Client        Non-Base
7301      ISSU ANCP Client         Non-Base
Switch#
This example shows how to display negotiated information regarding non-IOSd clients:
Switch# show package compatibility
     PackageName      PeerPackageName                       ModuleName    Compatibility
     -----------      --------------- --------------------------------    -------------
         rp_base              rp_base                              aaa       COMPATIBLE
         rp_base              rp_base                        aaacommon       COMPATIBLE
         rp_base              rp_base                    access_policy       COMPATIBLE
         rp_base              rp_base                         app_sess       COMPATIBLE
         rp_base              rp_base                     app_sess_ios       COMPATIBLE
         rp_base              rp_base                         auth_mgr       COMPATIBLE
......
......
License Upgrade on a VSS
When a current license is about to expire, or a new license is to be installed, perform the following task 
to update the license on a VSS:
Step 1 Ensure that the new license is installed on both VSS active (Switch 1) and VSS standby (Switch 2). If 
your device supports using Right-to-use (RTU) licensing, use the following command to activate the new 
license on both switches:
Switch# license right-to-use activate {ipbase |entservices | lanbase} acceptEULA
Step 2 Run the Switch# write memory command to save the configuration. 
Step 3 On Switch 2, the VSS standby, shutdown all the non-VSL ports. 
Caution Shutting down the VSL ports on the VSS active detaches the standby, which might transition to the VSS 
active. If not, reload the VSS standby and allow it to boot as the VSS active. A VSS standby booting as 
the active does not pose a network problem because all non-VSL ports are shutdown.
Step 4 On Switch 1, shut down the VSL ports. The VSS standby (Switch 2) becomes the VSS active switch. 
Step 5 Reload Switch 2.
Step 6 While Switch 2 boots up with the updated license, run the no shut command on the VSL ports on Switch 
1 and reload Switch1 immediately. Switch 2 boots as the VSS standby.
Step 7 When Switch 2 achieves SSO-HOT, run the no shut command on all ports. 
Step 8 Failover the chassis to bring the VSS pair license to the correct level. 
License installation and subsequent VSS formation are now complete.