Spanning Tree Algorithm Configuration 3

•Root Forward Delay – The maximum time (in seconds) this device will wait before changing states (i.e., discarding to learning to forwarding). This delay is required because every device 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 discarding state; otherwise, temporary data loops might result.

•Max hops – The max number of hop counts for the MST region.

•Remaining hops – The remaining number of hop counts for the MST instance.

•Transmission limit – The minimum interval between the transmission of consecutive RSTP/MSTP BPDUs.

•Path Cost Method – The path cost is used to determine the best path between devices. The path cost method is used to determine the range of values that can be assigned to each interface.

Web – Click Spanning Tree, STA, Information.

Figure 3-67 STA Information

CLI – This command displays global STA settings, followed by settings for each port.

Console#show spanning-tree

4-166

Spanning-tree information

 

---------------------------------------------------------------

Spanning tree mode:

MSTP

Spanning tree enable/disable:

enable

Instance:

0

Vlans configuration:

1-4094

Priority:

32768

Bridge Hello Time (sec.):

2

Bridge Max Age (sec.):

20

Bridge Forward Delay (sec.):

15

Root Hello Time (sec.):

2

Root Max Age (sec.):

20

Root Forward Delay (sec.):

15

Max hops:

20

Remaining hops:

20

Designated Root

32768.0.0000ABCD0000

Current root port:

1

Current root cost

200000

Number of topology changes:

1

Last topology changes time (sec.):

13380

3-115