Bridging
Changing Max Age Time
If the selected module is the Root Bridge or attempting to become the Root, and you want to change the maximum time that bridge protocol information will be kept before it is discarded:
1.Highlight the Max Age field, and type in a new value.
2.Click on Set.
The IEEE 802.1d specification recommends that Max Age = 20 seconds; the allowable range is 6 to 40 seconds.
Changing Forwarding Delay Time
If the selected module is the Root Bridge or attempting to become the Root, and you want to change the time period the bridge will spend in the Listening state (e.g. either listening to BPDU activity on the network while moving from the Blocking to the Learning state or in the Learning state while the bridge is moving from the Listening to the Forwarding state):
1.Highlight the Forwarding Delay field, and type in a new value.
2.Click on Set.
The IEEE 802.1d specification recommends that Forward Delay = 15 seconds; the allowable range is 4 to 30 seconds.
NOTE |
To ensure proper operation of the Spanning Tree Algorithm, the IEEE 802.1d specification recommends that you always observe the following relationship between Forwarding Delay and Max Age:
2 x (Forwarding Delay - 1.0) > Max Age
Changing Port Priority
To change the part of the Port Priority used in priority comparisons:
1.If necessary, select the desired port by clicking the mouse to highlight the port in the lower right quadrant of the window. The lower left quadrant of the window will now allow you to edit parameters for the selected port.
2.Highlight the port Priority field, and enter the new priority identifier. Only valid hexadecimal numbers (0 to FF) are allowed in this field. The default is 80 hexadecimal.
3.Click on Set. The new port priority will be saved.
Bridge Spanning Tree |