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User Manual
Publication date: July, 2006
Revision A2
35
Default Priority:
Default Priority is used for untagged packets hold QoS priority. It provide
8 priorities (0~7) in each port. When untagged packets enter one port of
the switch, they will have the precedence you set default priority in that
port. For instance, as you choose port 2 with default priority 2 and the
untagged frames get into the port 2 of the switch, they will possess
priority 2 QoS precedence. Then priority 2 packets must check the
setting of QoS function. In default, the priority 2 is in Queue 1. Finally, the
packets will obey the Scheduling Method, Weighted Round Robin or
Strict Priority, to reach QoS effect. Nevertheless, you want Default
Priority to act on, please enable tag–based VLAN in advance.
VIP Port:
VIP Port is particularly used for the “Strict Priority” method of QoS Setting
Scheduling. Please note that you should apply “Strict Priority” Scheduling
Method before the usage of VIP Port.
The function of VIP Port is to offer the highest priority of QoS to the port
you set up. As to the other ports with disabled VIP Port whose priority
cannot be higher than those with enabled VIP Port. For example, if port
2, 3 and 4(Port 2’s VIP Port is enabled) transmit untagged packets to port
1 at the speed of 100MB and result in the traffic congestion, then the
packets that port 1 had received will be only from port 2. Due to the
priorities of packets coming from port 3, 4 are lower than the ones of VIP
port - port 2, so the packets will form port 3, 4 will be dropped.
Furthermore, this VIP Port capability also cooperates with 802.1p QoS
similarly.