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106 ZT8101 Users Guide
Using the Web Console
To define the port members of an STP group
The switch allows you to configure Spanning Tree Groups that consist of a group of ports that will
be handled as though they were a single spanning tree device. An STP group uses the switch-level
parameters entered above, with the addition of port priority and port cost.
An STP group spanning tree works in the same way as the switch-level spanning tree, but the root
bridge concept is replaced with a root port concept. A root port is a port of the group that is elected
(on the basis of port priority and port cost) to be the connection to the network for the group.
Redundant links will be blocked, just as redundant links are blocked on the switch level.
An STP port group should correspond to a VLAN group of ports.
1. In the left panel, click Spanning Tree.
2. In the top panel, click STP Port Settings.
3. Configure these fields.
4. Click Apply.
The Status field displays whether the port is Disabled or Forwarding. The STP Name field
displays the assigned STP group name for the port.
Forwarding
Forwarding reduces traffic congestion on the network because packets are transmitted only to the
destination port rather than to all ports. The switch maintains a number of static forwarding tables
which you can manually configure for MAC, IP, and ARP forwarding.
This section explains how to configure
• MAC address aging
• MAC forwarding (unicast MAC address, multicast MAC address, and storm control)
• IP forwarding (static and default routes, static ARP)
Field Description
Cost
Specifies the port cost. It can be set between 1—65535. The lower the cost,
the greater the probability the port will be chosen as the designated port
(chosen to forward packets). The default value for the 10/100 ports is 19,
and for the 100/1000 ports it is 4.
Priority
Specifies the port priority. It can be set between 0—255. The default is 128.
The lower the priority, the greater the probability the port will be chosen as
the root port. If two ports have the same priority, the port with the lowest port
number is selected. For example, STP chooses port 1 over port 5 if they
both have the same priority.
State Enables or disables STP on the specified port or range of ports.