You all know that I've posted copiously about VLAN configuration for the
VSWITCH and the relationship of the default VLAN id (a guest <-> CP thing)
to the native VLAN id (a CP<->switch thing).
Today, when you define a trunking VSWITCH (specify the VLAN <defvid>
option), the native vlan ID (NATIVE <natvid>) defaults to <defvid>. In
almost every case this is wrong, since almost all switch configurations
keep VLAN 1 as the native VLAN id.
z/VM 5.4 APAR VM64604 (likely to close next week) will change that. With
the APAR, the native VLAN id for a virtual switch will default to 1. You
can override it if you want, but it will no longer default to the value
specified on the VLAN keyword.
It's a Good Thing and will help a larger percentage of trunking VSWITCHes
work correctly right out of the box.
There is no change to prior releases.
Regards,
Alan
Alan Altmark
Sr. Software Engineer
IBM z/VM Development
