Filter
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Management Functions 3 - 21
When attached to a subnetwork, the Bridge Module dynamically learns the
addresses of the nodes on the subnetwork. The Bridge Module looks at the
source address of each packet generated on the subnetwork and creates
the dynamic filter table from these addresses.
When a packet is received by the Bridge Module, its destination address is
compared to the addresses in the dynamic filter table. If the destination
address is found in the dynamic filter table, the packet is determined to be
local and the Bridge Module does not forward the packet to the other
subnetwork. If the address is not in the dynamic filter table, the packet
destination is assumed to be on a different subnetwork (or the destination
node has not generated any traffic) and the bridge forwards the packet
accordingly. (Use the SHOW FILTER DYNAMIC_ADDRESS_TABLE command
to list all dynamic addresses known by each port.)
Static Address Filter Table
The SET, CLEAR, and SHOW commands allow you to establish, remove, and
display permanent filtering attributes for specific nodes. The SET command
establishes a permanent entry in the static address filter table: an entry
which is never “aged out." This can improve network performance by
controlling the flow of packets based on your specific network topology
and traffic patterns.
For example, the following command tells the Bridge Module to never
forward packets to destination address 0800-8F00-0123 on port 2 from any
node connected to port 1.
OEBM> set filter static_address_table never_forward_to_port2
0800-8f00-0123 [ENTER]