Net To Net Technologies SIA2410R User Manual
Net To Net Technologies
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Configuring VLANs and QoS
The SIA2410R supports VLAN and QoS which are very useful features to
provide customers with differentiated services. VLAN features includes port-
based VLAN and tag insertion/removal actions on the egress port. Each port
of SIA2410R has two priority queues; one is the high-priority queue, the other
is the low-priority queue. Each frame is classified as a high or low priority
according to the policy that is configured by the user.
VLAN Modes
The perspective of the VLAN is from the input port and which output ports it
sees directly through SIA2410R. For example, if port 2 and port 4 participate
in port 1 and a frame comes into the port 1, the frame can go to only port 2
or port 4 (or to both), but it can’t go to port 3. Note that different ports can
be setup independently according to the rule described above. VLAN tag
actions (insertion/removal) applies to the egress port. There are three actions
in tag handling modes, and their operations are as follows;
Mode
Actions (on the egress port)
insertion
If a frame has a VLAN tag, no action taken; just transmitted as it received. If a
frame has no VLAN tag, a new VLAN tag (that is configured by user at the
ingress (
not egress
)
port) is included in the frame, then transmitted over the
egress port.
stripping
If a frame has VLAN tag, it is stripped and then transmitted over the egress
port. If a frame has no VLAN tag, no action is taken.
pass-through
A frame is transmitted over the egress port as it was received regardless of
VLAN tag (whether it has a tag or does not have a tag).
QoS Methods
The SIA2410R can determine priority through three different means. The first
method is a simple per port method, the second is via the 802.1p frame tag
and the third is by viewing the DSCP (IP TOS) field in the IPv4 header. Of
course for the priority to be effective, the high and low priority queues must
be enabled on the destination port or egress point.
