Allied Telesis AT-9000/28, AT-9000/52 manual Modifying Switch Spanning Tree Protocol Settings

Chapter 12: Setting Switch Spanning Tree Protocols

Modifying Switch Spanning Tree Protocol Settings

To modify port settings for Spanning Tree Protocol, do the following:

1.Select the Switching tab.

The Switching tab is displayed. See Figure 19 on page 58.

2.From the Switching tab, select Spanning Tree.

The Switch Spanning Tree Settings page is displayed. See Figure 48 on page 139.

3.Change the following settings as needed:

Active Protocol— Indicates if the active spanning tree protocol is STP or RSTP. The default setting is RSTP.

Status— Indicates if the spanning tree protocol is enabled or disabled on the switch.

Current Priority— By default, the current priority is set to 32,768. You cannot change this field.

New Priority (0-15)— Assigns the switch a priority number. The device that has the lowest priority number in the spanning tree domain becomes the root bridge. If two or more devices have the same priority value, the device with the numerically lowest MAC address becomes the root bridge.

The range is 0 to 61,440, in increments of 4,096. The range is divided into the sixteen increments listed in Table 2. You specify the increment that represents the desired bridge priority value. The default value is 32,768 (increment 8).

Table 3. STP Bridge Priority Value Increments

Increment	Bridge	Increment	Bridge
	Priority		Priority
0	0	8	32768
1	4096	9	36864
2	8192	10	40960
3	12288	11	45056
4	16384	12	49152
5	20480	13	53248
6	24576	14	57344

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