The IBM® OSA-Express VLAN
support allows a TCP/IP stack to register a specific VLAN identifier
for both IPv4 and IPv6. Note that the VLAN ID for IPv4 can be different
than the VLAN ID for IPv6. When a VLAN ID is configured, the following
situations occur:
- TCP/IP becomes VLAN aware or enabled, and this TCP/IP (IPv4 or
IPv6 connection) is considered to be part of the configured VLAN.
- During activation, TCP/IP registers the configured VLAN ID value
to OSA.
- A VLAN ID tag is added to all outbound packets.
- OSA filters inbound VLAN ID tagged packets based on the configured
VLAN ID.
- If this stack is also configured as a router (for example, PRIRouter),
the OSA primary router support is extended to this stack, allowing
it to serve as the primary router for the configured VLAN ID.
When configuring a z/OS® TCP/IP
stack with a VLAN ID, consideration must also be given to how the
LAN is partitioned and how the VLAN aware switches are configured.