General

Protocol Name

Specifies the spanning-tree protocol type: STP, MSTP, or RSTP.

None.

Disable

Disables spanning-tree protocol on the interface.

To enable this option, select the check box.

BPDU Protect

Specifies BPDU protection on all edge interfaces on the switch.

To enable this option, select the check box.

Bridge Priority

Specifies the bridge priority. The bridge priority determines which bridge is elected as the root bridge. If two bridges have the same path cost to the root bridge, the bridge priority determines which bridge becomes the designated bridge for a LAN segment.

Select a value from the list.

Forward Delay

Specifies the number of seconds an interface waits before changing from spanning-tree learning and listening states to the forwarding state.

Type a value.

Hello Time

Specifies the time interval in seconds at which the root bridge transmits configuration BPDUs.

Type a value.

Max Age

Specifies the maximum-aging time in seconds for all MST instances. The maximum aging time is the number of seconds a switch waits without receiving spanning-tree configuration messages before attempting a reconfiguration.

Type a value.

Max Hops

(MSTP only) Specifies the number of hops in a region before the BPDU is discarded.

Type a value.

Configuration Name

(MSTP only) Specifies the MSTP region name carried in the MSTP BPDUs.

Type a name.

Revision Level

(MSTP only) Specifies the revision number of the MSTP configuration.

Type a value.

Ports

Interface Name

Specifies an interface for the spanning-tree protocol.

1. Click the Ports tab.
2. Choose one:
   • Click Add and select an interface from the list.
   • Select an interface in the Port/State table and click Edit.
   • To delete an interface from the configuration, select it in the Port/State table and click Remove.

Cost

Specifies the link cost to determine which bridge is the designated bridge and which interface is the designated interface.

Type a value.

Priority

Specifies the interface priority to determine which interface is elected as the root port.

Select a value from the list.

Disable Port

Disables the spanning-tree protocol on the interface.

To enable the option, select the check box.

Edge

Configures the interface as an edge interface. Edge interfaces immediately transition to a forwarding state.

To enable the option, select the check box.

No Root Port

Specifies an interface as a spanning-tree designated port. If the bridge receives superior STP BPDUs on a root-protected interface, that interface transitions to a root-prevented STP state (inconsistency state) and the interface is blocked. This blocking prevents a bridge that should not be the root bridge from being elected the root bridge. When the bridge stops receiving superior STP BPDUs on the root-protected interface, interface traffic is no longer blocked.

To enable the option, select the check box.

Interface Mode

Specifies the link mode.

1. To enable the option, select the check box.
2. Select one:
   • Point to Point–For a full-duplex link, the default link mode is point-to-point.
   • Shared–For a half-duplex link, the default link mode is shared.

BPDU Timeout Action

Specifies the BPDU timeout action for the interface.

Select one:

• Alarm
• Block

MSTI

(MSTP only)

MSTI Name

Specifies a name (an MSTI ID) for the MST instance.

1. Click the MSTI tab.
2. Choose one:
   • Click Add.
   • Select an MSTI ID and click Edit.
   • To delete an MSTI from the configuration, select the MSTI ID and slick Remove.

Bridge Priority

Specifies the bridge priority. The bridge priority determines which bridge is elected as the root bridge. If two bridges have the same path cost to the root bridge, the bridge priority determines which bridge becomes the designated bridge for a LAN segment.

Select a value from the list.

VLAN ID

Specifies the VLAN for the MST instance.

In the VLAN box, choose one:

• Click Add, select a VLAN from the list and click OK.
• To remove a VLAN association, select the VLAN ID, click Remove, and click OK.

Interfaces

Specifies an interface for the MST instance.

1. In the Interfaces box, click Add and select an interface from the list, or select an interface from the list and click Edit.
2. Specify the link cost to determine which bridge is the designated bridge and which interface is the designated interface.
3. Specify the interface priority to determine which interface is elected as the root port.
4. If you want to disable the interface, select the check box.
5. Click OK.

To delete an interface configuration, select the interface, click Remove, and click OK.