The master switch revises the new member switch port numbers to conform to the current port numbering sequence in the stack. When you add a switch to a stack, the stack master automatically changes the configuration of the new switch. Return the switch to its default values before you connect it to a new stack. These switches do not use licenses to activate features.Ī switch previously used as a standalone or in a different stack might have different configuration settings. Note Activating a specific feature set on Catalyst 3750 switches requires a specific Cisco IOS version in each switch. After you connect a new switch to a switch stack, enter the show version user EXEC command to see the version information, the switch types, and the active Cisco IOS version for each switch: The Cisco IOS software version running on a switch that you plan to add to a switch stack must either be the same as or compatible with on the master switch version. The stack master reports the reason for any incompatibility. Switches with the same Cisco IOS version but different major version numbers are incompatible and cannot function in the same switch stack.Switches with different Cisco IOS versions can have different stack protocol versions.Switches with the same Cisco IOS version as the stack master can join the stack.Switches with the same Cisco IOS version also have the same stack protocol version and are compatible in the same switch stack.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.Resolving Version Mismatches and Copying Files.Problem: Stack Ring Is Not Operating at Full Bandwidth.Problem: Switch Does Not Join the Stack. ![]() Upgrading Catalyst 3750 and Catalyst 3750-E Switch Stacks Resolving Version Mismatches and Copying Files Using LEDs to Verify StackWise Link Connections ![]() Resolving Bandwidth Issues (Catalyst 3750 and Catalyst 3750-E Switches) Problem: Stack Ring Is Not Operating at Full Bandwidth Understanding Switch Hardware Priority and Stack Manager Version Reviewing How the Stack Master is Rebooted or Disconnected Reviewing How the Stack Master Is Elected and Port Numbers Are Assigned Joining a Stack: Typical Sequence States and Rules Resolving Software License Compatibility Issuesįixing SDM Template Configuration Incompatibilities (Catalyst 3750G-12S Switches)įixing Problems with StackWise Interfaces and Cables Troubleshooting Switch Stacks Table Of Contentsįixing Incompatible Cisco IOS Versions and Switch-Stack Protocol Versions
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