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S12700 V200R010C00 Configuration Guide - Device Management

This document describes the principles and configurations of the Device Management features, and provides configuration examples of these features.
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New Member Join and CSS Merge

New Member Join and CSS Merge

Member Switch Join

A new member switch can join a running single-chassis CSS. As shown in Figure 8-9, SwitchA is running in single-chassis CSS state. After SwitchB joins the CSS, the two switches set up a new CSS. SwitchA becomes the master switch, and SwitchB becomes the standby switch.

NOTE:

A single CSS-enabled switch is a single-chassis CSS.

Figure 8-9  New member switch joining a single-chassis CSS
A new member switch joins a single-chassis CSS in either of the following situations:
  • After two switches are connected using cluster cables, one of the two switches is configured with the CSS function and restarted. This switch enters the single-chassis CSS state. After the other switch is configured with the CSS function and restarted, it joins the CSS as the standby switch.
  • In a running two-chassis CSS, one switch is restarted. Then this switch joins the CSS again as the standby switch.

CSS Merge

Two single-chassis CSS systems can merge into one CSS. As shown in Figure 8-10, two single-chassis CSS systems merge into one and elect a master switch. The master switch retains its original configuration and its standby MPU resets, without affecting services. The standby switch restarts, joins the new CSS as the standby switch, and synchronizes the configuration file with the master switch. Original services on this standby switch are interrupted.

Figure 8-10  Two CSS systems merging into one
A CSS merge occurs in either of the following situations:
  • After two switches are configured with the CSS function and restarted, they run as single-chassis CSS systems. After they are connected using cluster cables, they merge into one CSS.
    NOTE:

    Setting up a CSS through a CSS merge is not recommended.

  • A CSS splits due to a failure of a cluster link or member switch. When the link or switch recovers, the two single-chassis CSS systems merge into one.
After two single-chassis CSS systems merge, the master switch is elected based on the following rules:
  1. The switch with longer running time becomes the master switch. This rule applies only when the two switches use MPUBs. If the difference in the running time of two switches is smaller than 20s, the system considers that the two switches have the same running time.
  2. The switch with a higher CSS priority becomes the master switch.
  3. If the two switches have the same priority, the switch with a smaller MAC address becomes the master switch.
  4. If the two switches have the same priority and MAC address, the switch with a smaller CSS ID becomes the master switch.
NOTE:
  • Ensure that the two chassis have different CSS IDs in both new member join and CSS merge scenarios. If the CSS IDs are the same, modify the CSS ID of one switch first.

  • The CSS will split if you remove all the SFUs on one chassis. If you install the SFUs to the chassis again but the chassis is not restarted, the CSS merge process starts. This chassis can only be selected as the standby switch because master election is not determined by the CSS priority in this case.

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Updated: 2019-08-21

Document ID: EDOC1000142080

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