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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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Joining and Leaving a Stack

Joining and Leaving a Stack

Joining a Stack

Figure 1-7 illustrates how a new switch joins a running stack.
NOTE:
  • A switch can be added to a stack while it is powered on or off. This section describes how a member switch joins a stack after being powered off. For details on how a member switch joins a stack after being powered on, see Stack Merging.

  • It is not recommended to add a member switch to a stack while the power is on.

Figure 1-7 A new member joins a stack

To add a switch to a stack, perform the following steps:

  1. Examine the physical connections between the current stack member switches and determine where to connect the new member switch.

    • If the stack has a chain topology, add the new switch to either end of the chain to minimize the impact on running services.
    • If the stack has a ring topology, tear down a physical link to change the ring topology to a chain topology, and add the new switch to either end of the chain. Then connect the switches on both ends to restore the ring topology.
  2. Complete stack configuration on the stack and new member switch and save the configuration.

  3. Power off the new member switch, connect it to the stack using stack cables, and power it on.

The new member switch joins the stack as a slave switch, and the original master and standby switches retain their roles. If the stack member ID of the new member switch conflicts with another member switch in the stack, the master switch assigns a new stack member ID to the new member switch. The member switch then updates the stack topology and synchronizes the stack topology to all the member switches.

Leaving a Stack

A member switch leaves a stack after it is disconnected from the stack. Depending on the role of the switch that has left the stack, the stack is affected in the following ways:
  • When the master switch leaves the stack, the standby switch becomes the new master switch. It then recalculates the topology, synchronizes the updated topology to the other member switches, and selects a new standby switch. Then the stack enters the running state.
  • When the standby switch leaves the stack, the master switch selects a new standby switch, recalculates the topology, and synchronizes the updated topology to the other member switches. Then the stack enters the running state.
  • When a slave switch leaves the stack, the master switch recalculates the topology and synchronizes the updated topology to the other member switches. Then the stack enters the running state.
A member switch leaves a stack after you disconnect its stack cables and remove it from the stack.
  • After removing a member switch from a ring stack topology, use a stack cable to connect the two ports originally connected to this member switch to ensure network reliability.
  • In a chain topology, removing an intermediate switch causes the stack to split. Therefore, analyze services before removing a member switch from the stack to minimize the impact on services.
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Updated: 2019-04-20

Document ID: EDOC1000166645

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