KSwitch D10 MMT Managed Time Sensitive Ethernet Switch - Preliminary User Guide, Rev. 0.99
// 85
9.7.
VLAN
9.7.1.
VLAN Configuration Commands and Port Types
VLAN Access
VLAN is a mean to split switch ports into sub port groups while each group is totally isolated from the other as if we
are using two or more independent switches. Such splitting is done by assigning different VLAN-IDs to various groups
of ports, each group is assigned a different VLAN-ID and the ports for each group are configured as Access ports
meaning that VLAN tagging and port splitting is done internally by the switch. The packets transmitted over Access
ports are the normal Ethernet ports with no VLAN tagging.
VLAN Trunk
VLAN Trunk port configuration allow multiple VLAN-IDs to travel over the same Ethernet cable or local LAN Network
with absolute isolation between the VLANs traveling over the same infrastructure.
VLAN Port Types:
Ports in hybrid mode allow for changing the port type, that is, whether a frame's VLAN tag is used to classify the
frame on ingress to a particular VLAN, and if so, which TPID it reacts on. Likewise, on egress, the Port Type
determines the TPID of the tag, if a tag is required.
VLAN Port Type - Unaware:
On ingress, all frames, whether carrying a VLAN tag or not, get classified to the Port VLAN, and possible tags are not
removed on egress.
VLAN Port Type - C-Port:
On ingress, frames with a VLAN tag with TPID = 0x8100 get classified to the VLAN ID embedded in the tag. If a frame
is untagged or priority tagged, the frame gets classified to the Port VLAN. If frames must be tagged on egress, they
will be tagged with a C-tag.
VLAN Port Type - S-Port:
On egress, if frames must be tagged, they will be tagged with an S-tag.
On ingress, frames with a VLAN tag with TPID = 0x88A8 get classified to the VLAN ID embedded in the tag.
Priority-tagged frames are classified to the Port VLAN. If the port is configured to accept Tagged Only frames (see
Ingress Acceptance below), frames without this TPID are dropped.
If the S-port is configured to accept Tagged and Untagged frames (see Ingress Acceptance in
the following text), frames with a C-tag are treated like frames with an S-tag.
If the S-port is configured to accept Untagged Only frames, S-tagged frames will be discarded (except for priority S-
tagged frames). C-tagged frames are initially considered untagged and will therefore not be discarded. Later on in
the ingress classification process, they will get classified to the VLAN embedded in the tag instead of the port VLAN
ID.
VLAN Port Type - S-Custom-Port:
On egress, if frames must be tagged, they will be tagged with the custom S-tag.
On ingress, frames with a VLAN tag with a TPID equal to the Ethertype configured for Custom-S ports get classified
to the VLAN ID embedded in the tag. Priority-tagged frames are classified to the Port VLAN. If the port is configured
to accept Tagged Only frames (see Ingress Acceptance below), frames without this TPID are dropped.
If the S-port is configured to accept Tagged and Untagged frames (see Ingress Acceptance in
the following text), frames with a C-tag are treated like frames with an S-tag.