Transition Networks
SISGM
–CHAS L2/L3 Switch User Guide
33625 Rev. B
Page
89
of
234
to VLAN-aware switches. Tx tag should be set to Untag_pvid when this mode
is used.
If
Specific
(the default value) is selected, a port VLAN ID can be configured
(see below). Untagged frames received on the port are classified to the port
VLAN ID. If VLAN awareness is disabled, all frames received on the port are
classified to the port VLAN ID. If the classified VLAN ID of a frame transmitted
on the port is different from the port VLAN ID, a VLAN tag with the classified
VLAN ID will be inserted in the frame.
Port VLAN ID
Configures the VLAN identifier for the port. The allowed range of the values is 1
through 4095. The default value is 1.
Note
: The port must be a member of the
same VLAN as the port VLAN ID.
Tx Tag
Determines egress tagging of a port.
Untag_pvid
: all VLANs except the configured PVID will be tagged.
Tag_all
: all
VLANs are tagged.
Untag_all
: all VLANs are untagged.
Introduction to Port Types
Each port type (Unaware, C-port, S-port, and S-custom-port) is described below.
Type
Ingress action
Egress action
Unaware
The function of
Unaware can be used
for 802.1QinQ (double
tag).
When the port receives untagged frames,
an untagged frame obtains a tag (based on
PVID) and is forwarded.
When the port receives tagged frames:
1. If the tagged frame contains a TPID of
0x8100, it will become a double-tag frame
and will be forwarded.
2. If the TPID of tagged frame is not 0x8100
(ex. 0x88A8), it will be discarded.
The TPID of a frame
transmitted by Unaware
port will be set to
0x8100.
The final status of the
frame after egressing
will also be affected by
the Egress Rule.
C-port
When the port receives untagged frames,
an untagged frame obtains a tag (based on
PVID) and is forwarded.
When the port receives tagged frames:
1. If the tagged frame contains a TPID of
0x8100, it will be forwarded.
The TPID of a frame
transmitted by C-port
will be set to 0x8100.
