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Linux on IBM eServer zSeries and S/390: VSWITCH and VLAN Features of z/VM 4.4

An IBM Redpaper publication

Note: This is publication is now archived. For reference only.


Published on 03 September 2003

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IBM Form #: REDP-3719-00

Authors: Vic Cross

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    z/VM Virtual Switch (VSWITCH) is a new z/VM networking function announced by IBM for z/VM Version 4 Release 4. This new feature is designed to improve the interaction between guests running under z/VM and the physical network connected to the zSeries processor.

    IBM also announced IEEE 802.1Q VLAN support for z/VM Virtual Switch, z/VM QDIO Guest LAN, and z/VM HiperSockets Guest LAN, allowing z/VM guests to create and participate in virtual LAN configurations.

    This Redpaper describes how the features can be utilized by Linux guests, and how your virtual networking configurations can be greatly simplified through the use of these new functions.

    We also describe some of our experiences with using z/VM Virtual Switch and VLANs on z/VM simulated networks.

    Table of Contents

    Introduction and overview

    VLAN support on z/VM Guest LAN

    z/VM Virtual Switch (VSWITCH)

    Using z/VM Virtual Switch

    Configuring Linux for VLAN

    Comparing VSWITCH with router-based designs

    High availability using z/VM Virtual Switch


    Command usage

    Switch configuration


    Command usage


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