Review these points about Cisco IOS versions and stack protocol versions: Fixing SDM Template Configuration Incompatibilities (Catalyst 3750G-12S Switches) Fixing Incompatible Cisco IOS Versions and Switch-Stack Protocol VersionsĪ new switch might not join a stack when Cisco IOS versions or stack protocol versions differ.Resolving Software License Compatibility Issues.Fixing Incompatible Cisco IOS Versions and Switch-Stack Protocol Versions.If a switch does not join a stack, look for incompatibilities between the stack master and member switches in relation to the Cisco IOS version, the license levels, and the configuration settings on the switches. Joining a Stack: Typical Sequence States and Rules Resolving Switch Compatibility Issues.Resolving StackWise Connection Problems.Connecting or disconnecting the StackWise cables when switches are powered on can cause switch reloads or temporary traffic loss in the active switches. Upgrading Catalyst 3750 and Catalyst 3750-E Switch Stacks Preventing Traffic Disruptionsīefore you connect a switch to or disconnect a switch from a stack, power it off.
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