DCFM Professional Plus User Manual (53-1001774-01, June 2010)

DCFM Professional Plus User Manual 395

53-1001774-01

5. Configure the following Spanning Tree Protocol parameters:

• Priority - The bridge priority. The value range is 0-61440 and the default value is 32768.

The value must be in increments of 4096.

• Mode - The spanning tree protocol mode. Options include Spanning Tree Protocol (STP),

Rapid Spanning Tree Protocol (RSTP), and Multiple Spanning Tree Protocol (MSTP).

• Forward Delay (sec) - The forward delay for the bridge. The value range is 4-30 seconds

and the default value is 15.

• Hello Time (sec) - The hello interval time for the bridge. The value range is 1-10 and the

default value is 2.

• Maximum Age (sec) - The maximum time to listen in seconds. The value range is 6-40 and

the default is 20 seconds. This feature is not available if running in MSTP mode.

The maximum age has a range of [2 x Hello Time +1] to [2 x Forward Delay - 1]. If you

specify a Maximum Age value that exceeds this range, an error message displays.

• Re-enable Port Interval - The interval after which the port will be enabled. The value range

is 10-1000000 and the default is 300.

• Re-enable Port State - Enables or disables the timeout mechanism for the port to be

enabled back.

• Path Cost - Sets the path cost behavior. Options include Standard and Custom.

You can set additional STP parameters, listed below, on the selected switch if MSTP Spanning

Tree Protocol is enabled, as shown in Figure 124.

• Cisco Interop - Enables or disables Cisco interoperability.

• Tx Hold Count - Select the transmit hold count for the bridge. The value range is 1-10.

• Max Hops - Specify the number of hops in a region before the Bridge Protocol Data Units

(BPDU) are discarded and the information held for a port is aged. The hop count

determines when to trigger a reconfiguration. The value range is 1-40 and the default is

20.

• Region - The Multiple Spanning Tree (MST) region.

• Revision - The revision number for the configuration. The value range is 0-255 and the

default is 0.