9E312/9E423 Module Bridging
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, Max Age, and Hello Time:
2 x (Forwarding Delay - 1.0) > Max Age > 2 x (Hello Time +1.0)
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 
. The new port priority will be saved.
Changing Path Cost
To change the Path Cost:
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 Path Cost field, and type in a new value from 1 to 65535 decimal (default is 100 decimal).
3.Click on 
.
The new path cost will be applied to the port.
Filtering Database
When the 9E312/9E423 switch is using Transparent Bridging, the Filtering Database, which makes up the IEEE 802.1d Source Address Table, is used to determine which frames will be forwarded or filtered between the 9E312/9E423 Module’s bridging interfaces.
During initialization, a bridge copies the contents of its Permanent Database to the Filtering Database. Next, the bridge learns network addresses by entering the source address and port association of each received packet into the Filtering Database. When in the Forwarding state, the bridge examines each received packet and compares the destination address to the contents of the Filtering Database. If the destination address is located on the network from which the packet was received, the bridge filters (does not forward) the packet. If the
Filtering Database |