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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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SVF Setup

SVF Setup

Switch Working Modes

Switches that can be used as leaf switches in an SVF system support the following working modes:
  • Stack mode: runs as an independent switch. A switch starting in this mode has complete system software and saves a configuration file.

  • Leaf mode: runs as a leaf switch in an SVF system. A switch starting in this mode can only connect to a parent switch as an extended interface card. It has no configuration or management functions, and does not save any configuration.

  • Auto-negotiation: determines whether to work in stack or leaf mode through auto-negotiation.

By default, a switch negotiates with the parent switch to determine its working mode, as shown in Figure 2-10. If a switch is powered on without any configuration (no startup configuration file), it initiates SVF negotiation by sending link probe packets and attempts to join an SVF system. If the switch has a configuration file, it starts in stack mode.

You can set the working mode of a switch. After you set the working mode of a switch to stack or leaf, the switch automatically starts in this mode and does not perform the negotiation.

Figure 2-10 Switch working mode determination

For details about ZTP, see ZTP Configuration in the CloudEngine 8800, 7800, 6800, and 5800 Series Switches Configuration Guide - Basic Configuration.

SVF Setup Process

After a switch starts in leaf mode, it obtains required information such as the leaf ID and software version from the parent switch. An SVF system is set up after the following steps:
  1. Leaf ID allocation: After leaf switches are connected to the parent switch, they send protocol packets to the parent switch. The parent switch then allocates leaf IDs to the leaf switches.

  2. Software version synchronization: The leaf switches obtain software version information from the parent switch. If the software version of a leaf switch is different from that of the parent switch, the leaf switch automatically downloads the system software from the parent switch. After the software download is complete, the leaf switch restarts with the new version and registers with the parent switch.

    Leaf switches only obtain a software package from the system software of the parent switch, not the complete system software. The system software of the parent switch contains two software packages with different functions. One is used for running the parent switch itself, and the other is synchronized to the leaf switches.

  3. Configuration delivery: The parent switch delivers configuration information to the leaf switches.

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Updated: 2019-04-20

Document ID: EDOC1000166645

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