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Catalyst 4500 Series Switch, Cisco IOS Software Configuration Guide - Cisco IOS XE 3.9.0E and IOS 15.2(5)E
Chapter 7 Configuring the Cisco IOS In-Service Software Upgrade Process
Performing the ISSU Process
Number of VRFs downgraded: 1
Switch(config)#
Your configuration will appear as follows:
ip vrf mgmtVrf
!
interface FastEthernet1
ip vrf forwarding mgmtVrf
ip address 10.1.1.1 255.255.255.0
speed auto
duplex auto
!
Step 2 Perform an ISSU downgrade to a pre-Cisco IOS XE 3.4.0SG/15.1(2)SGn image.
Step 3 Reconfigure the IPv6 address.
Switch# config t
Enter configuration commands, one per line. End with CNTL/Z.
Switch(config)# interface fa1
Switch(config-if)# ipv6 address 2000::1/64
Switch(config-if)# end
Switch#
Your configuration will appear as follows.
ip vrf mgmtVrf
!
interface FastEthernet1
ip vrf forwarding mgmtVrf
ip address 10.1.1.1 255.255.255.0
speed auto
duplex auto
ipv6 address 2000::1/64
Verifying the ISSU Software Installation
During the ISSU process, five valid states exist: disabled, init, load version, run version, and system
reset. Use the show issu state command to obtain the current ISSU state:
• Disabled state—The state for the standby supervisor engine while this engine is resetting.
• Init state—The initial state is two supervisor engines, one active and one standby, before the ISSU
process is started. It is also the final state after the ISSU process completes.
• Load version (LV) state—The standby supervisor engine is loaded with the new version of Cisco
IOS software.
• Run version (RV) state—The issu runversion command forces the switchover of the supervisor
engines. The newly active supervisor engine now runs the new Cisco IOS software image.
• System reset (SR) state—This state occurs either when you enter the issu abortversion command
before the Init state is reached, or if the rollback timer expires before you execute the
issu acceptversion command.
You can verify the ISSU software installation by entering show commands, as follows:
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