Cabletron Systems SSR-ATM29-02, User Manual, Page: 76 / 386

Chapter 6: Configuring SSR Bridging
76 CoreWatch User’s Guide
The maximum age is the length of time the SSR keeps the STP-protocol information it
receives. You can specify a number from 6 to 40. The default is 20.
8. In the Forward Delay box, enter the number of seconds you want to elapse between
the transitions of the different STP states.
Specify a number from 4 to 30. The default is 15.
9. Click OK.
The SSR bridge will use the specified STP settings. However, individual ports also have
STP settings that you can configure as discussed in
“Defining STP Attributes on an
Individual Port” on page 76 .
Defining STP Attributes on an Individual Port
In addition to the global STP settings discussed in “Defining STP Settings for SSR
Bridging” on page 75 , the SSR uses the following STP attributes that are set on individual
ports.
• Port priority
The STP algorithm uses the port priority to determine which port to use if a bridge has
two ports connected in a loop.
• Port cost
This attribute specifies how much a port contributes to the total cost of the path to the
root bridge when the port is the root.
A port uses the default settings for these attributes. You may, however, change these
default settings on individual ports. To change a port’s priority or cost:
1. Start Configuration Expert if you have not already done so.
2. Open the configuration file you want to modify and then double-click that file’s
Bridging Configuration object.
3. Double-click the Spanning Tree Protocol object.
4. In the list of STP objects that appears, double-click the Port Specific STP Settings
object.
Configuration Expert displays the Configure New Port object and objects for any
previously configured ports.
5. Do one of the following:
– If you are configuring a port’s STP attributes for the first time, select the Configure
STP Settings on a New Port object.
– If you are modifying existing STP settings of a port, select that port’s object from
the list that appeared after you expanded the Port Specific STP Settings object.