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If a switch is moved to a different stack, it loses its saved configuration file and uses the system-level configuration of the new stack. The interface-specific configuration of each member is associated with its member number. A stack member keeps its number unless it is manually changed or it is already used by another member in the same stack. If you r eplace a failed member with an identical model, the replacement member automatically uses the same interface-specific configuration.

You do not need to reconfigure the interface settings. The replacement switch must have the same member number as the failed switch. You back up and restore the stack configuration in the same way as you do for a standalone switch configuration. You manage the stack and the member interfaces through the master. You cannot manage members as individual switches. The stack is managed through a system-level IP address. You can still manage the stack through the same IP address even if you remove the master or any other stack member from the stack, provided there is IP connectivity.

Note Members keep their IP addresses when you remove them from a stack. To avoid having two devices with the same IP address in your network, change the IP address of the switch that you removed from the stack. The Secure Shell S SH connectivity to the stack can be lost if a master running the cryptographic version fails and is replaced by a switch that is running a noncryptographic version.

We recommend that a switch running the cryptographic version of the software be the master. You can connect to the master through the console port of one or more members. Be careful when using multiple CLI sessions to the master. Commands that you enter in one session are not displayed in the other sessions. Therefore, it is possible that you might not be able to identify the session from which you entered a command.

We recommend that you use only one CLI session when managing the stack. If you want to configure a specific member port, you must include the stack member number in the CLI notation. Most of the scenarios in Table assume at least two switches are connected through their stack ports. Table Switch Stack Configuration Scenarios. Master election specifically determined by existing masters. Connect two powered-on stacks through the stack ports.

Only one of the two masters becomes the new stack master. Master election specifically determined by the member priority value. Connect two switches through their stack ports. Use the switch stack-member-number priority new- priority-number global configuration command to set one member with a higher member priority value. Restart both members at the same time. The member with the higher priority value is elected master. Master election specifically determined by the configuration file. Assuming that both members have the same priority value:.

Make sure that one member has a default configuration and that the other member has a saved nondefault configuration file. The member with the saved configuration file is elected master. Master election specifically determined by the MAC address. Assuming that both members have the same priority value, configuration file, and software image, restart both stack members at the same time. The member with the lower MAC address is elected master. Assuming that one member has a higher priority value than the other member:.

Ensure that both members have the same member number. If necessary, use the switch current-stack-member-number renumber new-stack-member-number global configuration command. The member with the higher priority value keeps its member number. The other member has a new stack member number.

Power off the new switch. Through their stack ports, connect the new switch to a powered-on stack. Power on the new switch. The master is kept. The new switch is added to the stack. One of the remaining stack members becomes the new master. All other members in the stack remain members and do not restart. Through their stack ports, connect ten switches. Power on all switches. Two switches become masters. One master has four stack members.

The other master remains a standalone switch. Use the Mode button and port LEDs on the switches to identify which switches are masters and which switches belong to each master. For information about the Mode button and the LEDs, see the hardware installation guide. When you add or remove a stack member, the stack topology changes.

Cisco IOS recovers the data flow. Table shows the default switch stack configuration. Table Default Switch Stack Configuration. When a master is removed from the stack and a new master takes over, the MAC address of the new master to become the new stack MAC address. During this time period, if the previous master rejoins the stack, the stack continues to use that MAC address as the stack MAC address, even if the switch is now a member and not a master. If the previous master does not rejoin the stack during this period, the stack uses the MAC address of the new master as the stack MAC address.

This procedure is optional. Enable a time delay after a stack-master change before the stack MAC address changes to that of the new stack master. If the previous stack master rejoins the stack during this period, the stack uses that MAC address as the stack MAC address. If you enter the no stack-mac persistent timer command after a new stack master takes over, before the time expires, the stack uses the current master MAC address.

Verify that the stack MAC address timer is enabled. The output shows stack-mac persistent timer and the time in minutes. The output shows Mac persistency wait time with the number of minutes configured and the stack MAC address.

Optional Save your entries in the configuration file. Use the no stack-mac persistent timer global configuration command to disable the persistent MAC address feature. This example shows how to configure the persistent MAC address feature for a 7-minute time delay and to verify the configuration:. Note This task is available only from the master.

Beginning in privileged EXEC mode, follow these steps to assign a member number to a member. Specify the current member number and the new member number for the member. The range is 1 to 4. You can display the current member number by using the show switch user EXEC command. Beginning in privileged EXEC mode, follow these steps to assign a priority value to a member: This procedure is optional. Specify the member number and the new priority for the member.

The member number range is 1 to 4. The priority value range is 1 to You can display the current priority value by using the show switch user EXEC command. Beginning in privileged EXEC mode, follow these steps to provision a new member for a stack. Specify the member number for the provisioned switch. By default, no switches are provisioned.

For stack-member-number , the range is 1 to 4. Enter a member number that is not already used in the stack. See Step 1. For type , enter the model number of the member. Verify the correct numbering of interfaces in the configuration.

Verify the status of the provisioned switch. For stack-member-number , enter the same number as in Step 2. To remove provisioned information and to avoid receiving an error message, remove the specified switch from the stack before you use the no form of this command. This example shows how to provision a switch with a stack member number of 2 for the stack. The show running-config command output shows the interfaces associated with the provisioned switch:. If you remove powered-on members but do not want to partition the stack:.

Step 1 Power off the newly created stacks. Step 2 Reconnect them to the original stack through their stack ports. Step 3 Power on the switches. Note This task is only for debugging purposes, and is only available from the master. The stack member number range is 1 to 4. You can access specific members by using the session stack-member-number privileged EXEC command.

The member number is appended to the system prompt. For example, the prompt for member 2 is Switch-2 , and system prompt for the master is Switch. Enter exi t to return to the CLI session on the master. Only the show and debug commands are available on a specific member.

To display saved configuration changes after resetting a specific member or the stack, use these privileged EXEC commands:. Table Commands for Displaying Stack Information. Display stack port counters or per-interface and per-stack port send and receive statistics read from the hardware. Display all stack information, such as the stack protocol version.

Display summary information about the stack, including the status of provisioned switches and switches in version-mismatch mode. Display detailed information about the stack ring. If a stack port is flapping and causing instability in the stack ring, to disable the port, enter the switch stack-member-number stack port port-number disable privileged EXEC command.

To re-enable the port, enter the switch stack-member-number stack port port-number enable command. Note Be careful when using the switch stack-member-number stack port port-number disable command. When you disable the stack port,. When you enter the switch stack-member-number stack port port-number disable privileged EXEC command and. Stack Port 1 on Switch 1 is connected to Port 2 on Switch 4.

While Port 1 on Switch 1 is disabled and Switch 1 is still powered on:. Disconnect the stack cable between Port 1 on Switch 1 and Port 2 on Switch 4. Remove Switch 4 from the stack. Add a switch to replace Switch 4 and assign it switch-number 4.

Reconnect the cable between Port 1 on Switch 1 and Port 2 on Switch 4 the replacement switch. Re-enable the link between the switches. Power on Switch 4. Table show switch stack-ports summary Command Output. Switch number of the active member at the other end of the stack cable.

If the switch cannot detect the cable length, the value is no cable. The cable might not be connected, or the link might be unreliable. The link partner is a stack port on a neighbor switch. This shows if the stack port is in the same state as its link partner. If a large number of changes occur in a short period of time, link flapping can occur. Skip to content Skip to search Skip to footer. Book Contents Book Contents. Find Matches in This Book. Log in to Save Content.

PDF - Complete Book Updated: July 22, Chapter: Managing Switch Stacks. Understanding S tacks A switch stack is a set of up to four Catalyst S switches connected through their stack ports. From the master, you configure: System-level global features that apply to all members Interface-level features for each member If the stack master is running the cryptographic version that is, supports encryption of the software, the encryption features are available.

You can use these methods to manage stacks: Network Assistant available on Cisco. Adding powered-on switches m erging causes the masters of the merging stacks to elect a master from among themselves. The new master keeps its role and configuration and so do its members. All remaining switches, including the former masters, reload and join the stack as members.

They change their member numbers to the lowest available numbers and use the configuration of the new master. Removing powered-on members divides p artitions the stack into two or more switch stacks, each with the same configuration. This can create an IP address configuration conflict in your network. If you want the stacks to remain separate, change the IP address or addresses of the newly created stacks.

Master E lection The stack master is elected based on one of these factors in the order listed: 1. A stack master keeps its role unless one of these events occurs: The stack is reset. The master is reset or powered off. The master fails. The stack membership is increased by adding powered-on standalone switches or switch stacks. All members participate in re-elections. Members that are powered on within the same second time frame participate in the master election and have a chance to become the master.

Members that are powered on after the second time frame do not participate in this initial election and only become members. M ember Numbers The member number 1 to 4 identifies each member in the stack. If you manually change the member number by using the switch current-stack-member-number renumber new-stack-member-number global configuration command, the new number goes into effect after that member resets or after you use the reload slot stack-member-number privileged EXEC command and only if that number is not already changed.

If you move a stack member to a different switch stack, the stack member keeps its number only if the number is not being used by another member in the stack. If it is being used by another member in the stack, the switch selects the lowest available number in the stack. M ember Priority Values A high priority value for a member increases the chance that it will be elected master and keep its member number.

Stack Offline Configuration You can use the offline configuration feature to provision to configure a new switch before it joins the stack. Effects of Adding a Provisioned Switch to a Stack When you add a provisioned switch to the switch stack, the stack applies either the provisioned configuration or the default configuration to it.

If the stack member number of the provisioned switch matches the stack member number in the provisioned configuration on the stack, and 2. If the stack member number of the provisioned switch matches the stack member number in the provisioned configuration on the stack, but 2. The stack member numbers and the switch types match: 1. If the new stack member number of the provisioned switch matches the stack member number in the provisioned configuration on the stack, and 2.

The stack member numbers match, but the switch types do not match: 1. Effects of Replacing a Provisioned Switch in a Stack When a provisioned switch in a switch stack fails, is removed from the stack, and is replaced with another switch, the stack applies either the provisioned configuration or the default configuration to it.

Effects of Removing a Provisioned Switch from a Stack If you remove a provisioned switch from the switch stack, the configuration associated with the removed stack member remains in the running configuration as provisioned information.

Stack S oftware Compatibility Recommendations All stack members must run the same Cisco IOS software version to ensure compatibility in the stack protocol version among the members. Sta ck Protocol Version Compatibility The stack protocol version has a major version number and a minor version number for example 1.

Minor Version Number Incompatibility Among Switches Switches with the same major version number but with a different minor version number as the master are considered partially compatible. Understanding Auto-Upgrade and Auto-Advise When the software detects mismatched software and tries to upgrade the switch in version-mismatch mode, two software processes are involved: automatic upgrade and automatic advise.

The automatic upgrade auto-upgrade process includes an auto-copy process and an auto-extract process. By default, auto-upgrade is enabled the boot auto-copy-sw global configuration command is enabled. You can disable auto-upgrade by using the no boot auto-copy-sw global configuration command on the master. You can check the status of auto-upgrade by using the show boot privileged EXEC command and by checking the Auto upgrade line in the display. Automatic advise auto-advise — when the auto-upgrade process cannot find appropriate version-mismatch member software to copy to the switch in version-mismatch mode, the auto-advise process tells you the command archive copy-sw or archive download-sw privileged EXEC command and the image name tar filename needed to manually upgrade the switch stack or the switch in version-mismatch mode.

The recommended image can be the running stack image or a tar file in any flash file system in the stack including the switch in version-mismatch mode. If an appropriate image is not found in the stack flash file systems, the auto-advise process tells you to install new software on the stack. Auto-advise cannot be disabled, and there is no command to check its status. Auto-Upgrade and Auto-Advise Example Messages When you add a switch that has a different minor version number to the stack, the software displays messages in sequence assuming that there are no other system messages generated by the switch.

Incompatible Software and Member Image Upgrades You can upgrade a switch that has an incompatible software image by using the archive copy-sw privileged EXEC command to copy the software image from an existing member. S tack Configuration Files The master has the saved and running configuration files for the stack. System-level global configuration settings—such as IP, STP, VLAN, and SNMP settings—that apply to all members Member interface-specific configuration settings, which are specific for each member A new, out-of-box switch joining a stack uses the system-level settings of that stack.

If an interface-specific configuration does not exist for that member number, the member uses its default interface-specific configuration. If an interface-specific configuration exists for that member number, the member uses the interface-specific configuration associated with that member number.

Stack Through an SSH Session The Secure Shell S SH connectivity to the stack can be lost if a master running the cryptographic version fails and is replaced by a switch that is running a noncryptographic version. Stack Through Console Ports You can connect to the master through the console port of one or more members. Specific Members If you want to configure a specific member port, you must include the stack member number in the CLI notation. Stack Configuration Scenarios Most of the scenarios in Table assume at least two switches are connected through their stack ports.

Table Switch Stack Configuration Scenarios Scenario Result Master election specifically determined by existing masters Connect two powered-on stacks through the stack ports. Master election specifically determined by the member priority value 1. Master election specifically determined by the configuration file Assuming that both members have the same priority value: 1. Master election specifically determined by the MAC address Assuming that both members have the same priority value, configuration file, and software image, restart both stack members at the same time.

Member number conflict Assuming that one member has a higher priority value than the other member: 1. Add a member 1. Master failure Remove or power off the master. Add more than four members 1. Member number 1 Member priority value 1 Offline configuration The switch stack is not provisioned. Persistent MAC address Disabled.

Caution When you configure this feature, a warning message displays the consequences of your configuration. You should use this feature cautiously. Using the old master MAC address elsewhere in the domain could result in lost traffic. You can set the time period from 0 to 60 minutes. If you enter the command with no value, the default delay is 4 minutes.

Catalyst all models. Catalyst X. N [Apr '23]. N [Apr '25]. Click here. Catalyst XR. Catalyst L. N [Oct '22]. N [Oct '24]. Catalyst C. N [Oct '23]. Catalyst CX. Catalyst CDB-8P. Catalyst CDB-8U. Catalyst Modular. Sup 7L-E. Sup 8-E. Sup 8L-E. Sup 9-E.

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