![]() ![]() VSS is supported on Cisco Release IOS XE 3.4.0SG and later. This chapter describes how to configure a virtual switching system (VSS) for the Catalyst 4500/4500X series switch (Supervisor Engine 7-E, Supervisor Engine 7L-E, Supervisor Engine 8-E, Supervisor Engine 8L-E, Catalyst 4500-X). Configuring the Rollback Timer to Safeguard Against Upgrade Issues.Aborting a Software Upgrade During ISSU.Using changeversion to Automate an ISSU Upgrade.ISSU using the Four Command Sequence: Step 4 (commitversion).ISSU using the Four Command Sequence: Step 3 (acceptversion).ISSU using the Four-command Sequence: Step 2 (runversion).ISSU using the Four-command Sequence: Step 1 (loadversion).Verifying the ISSU State Before Beginning the ISSU Process.Verifying Redundancy Mode Before Beginning the ISSU Process.Verifying the ISSU Software Installation.Compatibility Verification Using Cisco Feature Navigator.Performing an ISSU Upgrade: Two Methods. ![]() Traffic and Network Protocol Disruption During ISSU in a VSS.In-Service Software Upgrade (ISSU) on a VSS. ![]()
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