Chapter 13 Spanning Tree Protocol
The following table describes the labels in this screen.
Table 33 Advanced Application > Spanning Tree Protocol > MSTP
LABEL | DESCRIPTION |
Status | Click Status to display the MSTP Status screen (see Figure 69 on page |
| 166). |
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|
Active | Select this check box to activate MSTP on the Switch. Clear this |
| checkbox to disable MSTP on the Switch. |
| Note: You must also activate Multiple Spanning Tree in the |
| Advanced Application > Spanning Tree Protocol > |
| Configuration screen to enable MSTP on the Switch. |
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. |
|
|
MaxAge | 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) |
|
|
Maximum hops | Enter the number of hops (between 1 and 255) in an MSTP region |
| before the BPDU is discarded and the port information is aged. |
|
|
Configuration | Enter a descriptive name (up to 32 characters) of an MST region. |
Name |
|
|
|
Revision | Enter a number to identify a region’s configuration. Devices must have |
Number | the same revision number to belong to the same region. |
|
|
Apply | Click Apply to save your changes to the Switch’s |
| Switch loses these changes if it is turned off or loses power, so use the |
| Save link on the top navigation panel to save your changes to the non- |
| volatile memory when you are done configuring. |
|
|
Cancel | Click Cancel to begin configuring this screen afresh. |
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|
Instance | Use this section to configure MSTI (Multiple Spanning Tree Instance) |
| settings. |
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|
Instance | Enter the number you want to use to identify this MST instance on the |
| Switch. The Switch supports instance numbers |
| 163 |
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