Chapter 22 Spanning Tree Protocol

Table 51 Spanning Tree Protocol (continued)

LABEL

DESCRIPTION

Forwarding Delay

This is the maximum time (in seconds) a switch will wait before 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)

 

 

Port

This field identifies the Ethernet port.

 

 

Active

Select this check box to activate STP on this port.

 

 

Priority

Configure the priority for each port here.

 

Priority decides which port should be disabled when more than one port forms a

 

loop in a switch. Ports with a higher priority numeric value are disabled first. The

 

allowed range is between 0 and 255 and default value is 128.

 

 

Path Cost

Path cost is the cost of transmitting a frame on to a LAN through that port. It is

 

assigned according to the speed of the bridge. The slower the media, the higher

 

the cost.

 

 

Apply

Click Apply to save your changes to the IES-612-51A’s volatile memory. The

 

IES-612-51A loses these changes if it is turned off or loses power, so use the

 

Config Save link on the 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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IES-612-51A User’s Guide