Comment 18 for bug 1996007

Hi liwbj, ok, knowing this difference is important.

Having a look at the OSA implementation Guide (Redbook): https://www.redbooks.ibm.com/redbooks/pdfs/sg245948.pdf

Trunk mode
Trunk mode indicates that the switch should allow all VLAN ID tagged packets to pass
through the switch port without altering the VLAN ID. This mode is intended for servers that
are VLAN-capable, so the switch filters and processes all VLAN ID tagged packets. In trunk
mode, the switch is programmed to receive VLAN ID-tagged packets that are inbound to the
switch port.

Access mode
Access mode indicates that the switch should filter on specific VLAN IDs and allow only
packets that match the configured VLAN IDs to pass through the switch port. The VLAN ID is
then removed from the packet before it is sent to the server. That is, VLAN ID filtering is
controlled by the switch. In access mode, the switch is programmed to receive packets
without VLAN ID tags that are inbound to the switch port.

That let's me assume that it's related to the current switch configuration.