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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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Joining and Leaving a Stack

Joining and Leaving a Stack

Adding a Member Switch to a Stack

Figure 9-5 illustrates how a new switch is added to 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 9-5  Member switch joins a stack
A new member switch joins a stack as follows:
  1. After the switch is connected to the stack and is powered on, it is elected as a slave switch. The roles of the other member switches in the stack remain unchanged.

  2. The master switch updates the stack topology information, synchronizes the stack topology information to the other member switches, and assigns a stack ID to the new member switch (if the new member switch has no stack ID configured or the configured stack ID conflicts with that of another member switch).

  3. The new member switch updates its stack ID and synchronizes its configuration file and system software with the master switch. Then it enters the running state.

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 at two ends to form a ring if required.
  2. Complete the stack configuration.

    • If the member switches are connected by service ports, configure the connected service ports on the new member switches as physical member ports of the logical stack port. If the stack has a chain topology, perform this configuration also at one or both ends of the chain.
    • If the member switches are connected by stack cards, enable the stacking function on the new member switch.
    • To facilitate device management, configure a stack ID for the new member switch. If no stack ID is configured for the new member switch, the master switch will assign a stack ID to it.
  3. Power off the new member switch, connect it to the stack using stack cables, and power it on.

  4. Repeat steps 1 through 3 to add more switches to the stack.

  5. Save the configuration.

Removing a Member Switch from 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 topology information, synchronizes updated topology information 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 topology information, and synchronizes updated topology information to the other member switches. Then the stack enters the running state.
  • When a slave switch leaves the stack, the master switch recalculates topology information and synchronizes updated topology information 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. When removing a member switch, pay attention to the following points:
  • 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: 2019-09-23

Document ID: EDOC1000178167

Views: 205695

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