![]() If the active does not respond, the standby becomes the active. If the standby does not respond, a new standby is elected. If a stack member does not respond, that member is removed from the stack. Hello messages are sent and received by all stack members. You can connect standalone to an existing stack to increase the stack membership. You can connect one standalone to another to create a stack containing two stack members, with one of them as the active switch. Each stack member hasĪ current copy of these files for back-up purposes.Ī standalone is a stack with one stack member that also operates as the active switch. The system-level settings for the switch stack and the interface-level settings for each stack member. The active switch contains the saved and running configuration files for the switch stack. Interface-level features for each stack member System-level (global) features that apply to all stack members ![]() The active switch controls the operation of the switch stack, and is the single point of stack-wide management. Switch assumes the role of the active switch, and continues to the keep the stack operational. If the active switch becomes unavailable, the standby Layer 2 and Layer 3 protocols present the entire switch stack as a singleĪ switch stack always has one active switch and one standby switch. Note that Cisco Catalyst 9300L series switches connect through their StackWise-320 ports.The stack members work together as a unified system. ![]() You cannot have a switch stack containing a mix of different license levels.Ī switch stack can have up to eight stacking-capable switches connected through their StackWise -480 ports. It does not have any functional or operational impact. The current state 'NO_NEIGHBOR': rep_lsl_rx Gix/x/x -Traceback= Only homogenous stacking is supported, that is, a stack of Cisco Catalyst 9300 Series Switches stack with only Cisco Catalyst 9300 Series Switches as stack members.Ĭisco Catalyst 9300L Series Switches stack with only Cisco Catalyst 9300L Series Switches as stack members.Ĭ9300-24UB, C9300-24UXB, and C9300-48UB switches can only be stacked with each other.ĭuring a switchover, when the standby device syncs with the active device, the following log message is displayed on the console: %SM-4-BADEVENT: Event 'standby_phy_link_up' is invalid for The following are restrictions for your switch stack configuration: See the System Management section of this guide.Īll the switches in the switch stack must be running compatible software versions. Feature History and Information for Switch StacksĪll the switches in the stack must be running the same license level as the active switch.Additional References for Switch Stacks.Fixing a Bad Connection Between Stack Ports: Example.Finding a Disconnected Stack Cable: Example.Software Loopback with no Connected Stack Cable: Example.Software Loopback with Connected Stack Cables: Examples.show switch stack-ports detail Command Output: Example.show switch stack-ports summary Command Output: Example.Provisioning a New Member for a Switch Stack: Example.Enabling the Persistent MAC Address Feature: Example.Configuration Examples for Switch Stacks.Reenabling a Stack Port While Another Member Starts.Upgrading a Switch Running Incompatible Software.Offline Configuration to Provision a Stack Member.Active and Standby Switch Election and Reelection.Persistent MAC Address on the Switch Stack.
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