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3 - 20 ONline Ethernet Bridge Module Installation and Operation Guide
AGEING_TIME
The AGEING_TIME parameter tells the Bridge Module when to “age out”
(automatically remove) addresses from the dynamic filtering table (default
ageing period is 5 minutes). Once you set this value, the bridge will remove
addresses from the table when the node with the specific address fails to
transmit for the age period. For example, the command below would age
out an address once it was inactive for 17 minutes.
OEBM> set ageing_time 17 [ENTER]
Note that this command has no effect on addresses in the static address
table filter table.
Spantree
The SET SPANTREE command controls all of the Spanning Tree
configuration settings. These settings include:
– bridge priority
– forward delay time
– hello and listen times
–mode
– the path cost for each port
Refer to the SET SPANTREE section in Chapter 4 for more information on
the SPANTREE command. Refer to Appendix B for information on the
Spanning Tree Algorithm and Protocol.
Filtering Parameters
Filtering is an important capability of the Bridge Module because it allows
particular nodes to be isolated on different subnetworks. This feature keeps
heavy traffic on one subnetwork from slowing down the entire network.
There are two filtering tables that the bridge uses: the dynamic filter table
and the static address filter table. The dynamic filter table is generated
automatically by the bridge as explained below and the static address filter
table is built using the SET FILTER command.