Chapter 13 Spanning Tree Protocol
The following table describes the labels in this screen.
Table 29 Advanced Application > Spanning Tree Protocol > RSTP
LABEL | DESCRIPTION |
Status | Click Status to display the RSTP Status screen (see Figure 64 on page |
| 157). |
|
|
Active | Select this check box to activate RSTP. Clear this checkbox to disable |
| RSTP. |
| Note: You must also activate Rapid Spanning Tree in the |
| Advanced Application > Spanning Tree Protocol > |
| Configuration screen to enable RSTP on the Switch. |
Bridge Priority | Bridge priority is used in determining the root switch, root port and |
| designated port. The switch with the highest priority (lowest numeric |
| value) becomes the STP root switch. If all switches have the same |
| priority, the switch with the lowest MAC address will then become the |
| root switch. Select a value from the |
| The lower the numeric value you assign, the higher the priority for this |
| bridge. |
| Bridge Priority determines the root bridge, which in turn determines |
| Hello Time, Max Age and Forwarding Delay. |
|
|
Hello Time | This is the time interval in seconds between BPDU (Bridge Protocol Data |
| Units) configuration message generations by the root switch. The |
| allowed range is 1 to 10 seconds. |
|
|
Max Age | This is the maximum time (in seconds) a switch can wait without |
| receiving a BPDU before attempting to reconfigure. All switch ports |
| (except for designated ports) should receive BPDUs at regular intervals. |
| Any port that ages out STP information (provided in the last BPDU) |
| becomes the designated port for the attached LAN. If it is a root port, a |
| new root port is selected from among the switch ports attached to the |
| network. The allowed range is 6 to 40 seconds. |
|
|
Forwarding | This is the maximum time (in seconds) a switch will wait before |
Delay | changing states. This delay is required because every switch must |
| receive information about topology changes before it starts to forward |
| frames. In addition, each port needs time to listen for conflicting |
| information that would make it return to a blocking state; otherwise, |
| temporary data loops might result. The allowed range is 4 to 30 |
| seconds. |
| As a general rule: |
| Note: 2 * (Forward Delay - 1) >= Max Age >= 2 * (Hello Time + 1) |
|
|
Port | This field displays the port number. |
|
|
* | Settings in this row apply to all ports. |
| Use this row only if you want to make some settings the same for all |
| ports. Use this row first to set the common settings and then make |
| adjustments on a |
| Note: Changes in this row are copied to all the ports as soon as you |
| make them. |
| 155 |
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