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CloudEngine 8800, 7800, 6800, and 5800 V200R002C50 Configuration Guide - Virtualization

This document describes the configurations of virtualization, including stack and SVF.
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Stack Merging

Stack Merging

As shown in Figure 1-8, two stacks in the running state can merge into one stack. After two stacks merge, the master switches of the two stacks compete to be the master switch of the new stack. The two switches compare the following items in the listed order to elect the master switch (the election ends when a winning switch is found):
  • Stack priority: The switch with a higher stack priority becomes the master switch.

  • Software version: The switch running a later software version becomes the master switch.

  • Bridge MAC address: The switch with a smaller bridge MAC address becomes the master switch.

    During the delivery of a device, 16 MAC addresses are allocated to the device, among which the smallest MAC address becomes the bridge MAC address.

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, and services on these switches are interrupted.
Figure 1-8 Two stacks merge
Stack merging occurs in either of the following situations:
  • A switch is configured with the stacking function and is connected to a running stack using a stack cable while the power is on.
  • 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.

The stack merging process is similar to the process when a new member switch joins a stack. For details, see Joining and Leaving a Stack. The master competition rules used in a stack merging process are the same as the master election rules used in a stack.

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Updated: 2019-04-20

Document ID: EDOC1000166645

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