PLANET WGSW-48000 - Manual (Page 73)

User’s Manual of WGSW-48000
73
4.5.1 RSTP (Rapid Spanning Tree Protocol)
The Rapid Spanning Tree Protocol (RSTP) provides rapid convergence of the spanning tree by assigning port roles and by
determining the active topology. The RSTP builds upon the IEEE802.1D STP protocol to select the switch with the highest
switch priority as the root switch.
Figure 4-5-4 RSTP
The page includes the following fields:
Object Description
• Enable RSTP Enables RSTP of the switch will allow you to control the RSTP parameters from
the bridge point of view.
• Priority Specifies the bridge priority value. When switches or bridges are running STP,
each is assigned a priority.
The default value is 32768 .
The port priority value is provided in increments of 4096. For example, 4096,
8192, 12288, etc. The range is 0 to 61440.
• Max Age The max age timer controls the maximum length of time that passes before a
bridge port saves its configuration BPDU information.
• Forward Delay Forward delay is a time value, which controls how fast a port changes its state.
The value determines how long the port stays in each of the listening and
learning states which precede the forward state. This value is also used to age all
dynamic entries in the forwarding databases when a topology change has been
detected and is underway.
• Designated Root
Bridge
The bridge identifier of the root of the spanning tree is determined by the RSTP
protocol as executed by this node. The bridge identifier value is used as the root
identifier parameter in all configuration bridge BPDUs originated by this node.