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Configuration Guide - Device Management

S1720, S2700, S5700, and S6720 V200R011C10

This document describes the principles and configurations of the Device Management features, and provides configuration examples of these features.
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Stack Merging

Stack Merging

Two stacks in the running state can merge into one stack. As shown in Figure 9-6, after two stacks merge, the master switches of the two stacks compete to be the master switch of the new stack. After the new master switch is elected, the member switches originally belonging to the same stack as this new master switch retain their roles and configurations, and their services are unaffected. Switches in the other stack restart and join the new stack as slave switches. The master switch assigns new stack IDs to these switches. Then these switches synchronize their configuration files and system software with the master switch. During this time, services on these switches are interrupted.

The stack merging process is similar to the process when a new member switch joins a stack. For details, see Adding a Member Switch to a Stack. When two stacks merge, a new master switch is elected between the two original master switches. The master switch in the stack that enters the running state first becomes the new master switch. If the two stacks enter the running state at the same time, the master switch is elected based the same rules used when a stack is set up.

Figure 9-6  Two stacks merge
Stack merging occurs in either of the following situations:
  • A stack splits because a stack link or member switch fails. After the stack link or member switch recovers, the two stacks merge into one again.
  • A switch is configured with the stacking function and is connected to a running stack using a stack cable while the power is on. Connecting a running switch to a running stack is not recommended, because this may cause a restart of the running stack before the merge, resulting in service interruption.
Updated: 2019-10-21

Document ID: EDOC1000178167

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