Hitachi Compute Blade 2000 User Manual page 1355

How to use the VLAN function

(1) Overview of the VLAN functions
Virtual NIC functions support the Tagged VLAN function, which complies with
IEEE802.1Q. You can use the VLAN functions to achieve a flexible operating
environment, such as:
Creating multiple broadcast domains.

Setting multiple VLAN IDs.

Using an IEEE802.1Q format tag for the interface with the external switches.

Provides functions equivalent to an Intel
825xx physica l NIC
VLAN ID=10
Broadcast
domain A
LPAR1
VLAN ID=20
LPAR2
Broadcast
domain B
VLAN ID=20
LPAR3
: virtual NIC
: physical NIC
(2) How to Use the VLAN Function
Virtual NIC functions provide two types of VLAN functions, and setting to one of
them enables the function. You can make these settings for each virtual NIC from
the Virtual NIC (VNIC) Assignment screen.
Untagged port

This setting is for receiving untagged frames from one specified VLAN group.
A virtual NIC for which "untagged port" is specified receives only frames from
the group with the same VLAN ID number, and these frames do not include
tags. When transferring frames from a virtual NIC specified as an "untagged
port" to an external switch or to a virtual NIC specified as a "tagged port" in the
same VLAN group, the frames are tagged with the IEEE802.1Q format.
If "untagged" is specified, only one VLAN ID can be specified.
Tagged port

This setting is for receiving tagged frames (IEEE802.1Q) from more than one
specified VLAN group.
A virtual NIC for which "tagged port" is specified can receive both tagged
frames with the specified VLAN ID and untagged frames. Tagged frames sent
from a virtual NIC with the "tagged port" specification are sent to the same
group as the VLAN ID in the tag, and untagged frames are sent to groups for
which no VLAN has been set. When frames are transferred to external switches,
they are transferred as they are, with or without tags.
When specifying "tagged" for a virtual NIC, you can set up to 16 VLAN IDs for
one virtual NIC. To use more than 17, set "ALL" to allow all VLAN IDs to be
received.
Provides trunk port functions: tagged packet transmission to
internal or external switches
Virtual network
segment
LPAR manager
Intern al or
external
switch
1304
VLAN ID=10
VLAN ID=20
VLAN ID=20
The switch port linked to the
shared physical NIC needs to be
set to handle tagged packets