On Wednesday, 12/03/2003 at 07:20 CST, Adam Thornton <[EMAIL PROTECTED]> wrote: > On Wed, 2003-12-03 at 18:54, Romney White wrote: > > Mark: > > > > VSWITCH has an *optional* associated OSA Express device. If you don't > > have one, you don't have external connectivity, but a VSWITCH is just > > really a QDIO Guest LAN with an optional associated real QDIO device. > > Fair enough, but isn't the point of the VSWITCH to bridge your Linux > guests into an external LAN, rather than VM (or Linux) having to act as > a router? In which case, a VSWITCH without external connectivity is, > well, a guest LAN, innit?
Almost. VSWITCHes are different from Guest LANs in the following ways: - They are always PERSISTENT - They are always owned by SYSTEM - They cannot be defined by class G users - They support IEEE VLAN id assignments - They can be optionally "bridged" to an external network When you combine the VLAN and bridging capabilities, you can use a singleVSWITCH (one OSA connection) to bring data onboard for multiple VLAN segments! Way Cool!! But you're right that, from a guest's point of view, a VSWITCH and Guest LAN (OSA flavor) are identical. Alan Altmark Sr. Software Engineer IBM z/VM Development
