Allied Telesis AT-S20 - Manual (Page 58)

Configuring for Bridging
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Bridging
The options under the Bridging Menu item are for configuring and
enabling spanning tree.
As a bridge, the switch:
❑ Learns source and destination MAC addresses of incoming
packets by storing the information in a forwarding table (see
also Activity Monitor on page 6-2).
❑ Forwards the packet to the destination’s network segment if
the source is from a different network segment; or discards
the packet if the source and destination address are on the
same segment because all stations on the segment have
already received the packet.
❑ Ages out the addresses (deletes the information from the
table) if undetected by any port within a user-defined or a
default elapsed time.
❑ Updates the MAC address table automatically as you add,
remove, or relocate devices on the network.
❑ Prevents loops with spanning tree.
❑ Updates other bridges with topology information by
periodically sending bridge protocol data units (BPDUs).
When you select Bridging from the Main Menu, the following
screen displays:
Figure 4-3 Bridging Submenu
You are now ready to configure or disable spanning tree. Note that
Spanning Tree is on by default. See Configuring Spanning Tree
Parameters.
If you want an overview of the Spanning Tree Protocol (STP) before
proceeding, go to Appendix A, Spanning Tree Protocol.
Spanning tree parameters
Port spanning tree confirmation
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