User Manual
Table Of Contents
- Copyright
- Trademarks
- Product Configuration
- Introduction
- Overview
- Operating Mode Descriptions
- Setup
- Settings
- Preparing the Utility Software
- Utility Software Settings
- Setting Descriptions
- To Register or Set Up a New Access Point
- To Edit Settings for an Existing Access Point
- To Use Data scramble Functions for Better Security
- To Use SNMP Agent Functions
- To Use Spanning Tree
- To Access the APL from a Different Router
- Spanning Tree Algorithms (STA)
- What is an STA?
- STA Parameters
- Sample STA Application
- _
- All settings other than bridge priority settings are identical.
- The root bridge is determined by the priority settings of each ...
- The designated bridge for each LAN segment is determined by roo...
- The designated port for each bridge is determined by the design...
- The root port of each bridge is determined by its path cost to ...
- Ports that are neither designated ports nor root ports are back...
- _
- SNMP Agent Functions
- Troubleshooting
- Appendix
- Product Specifications
- Input/Output Interface
- Glossary
- _
- IEEE (Institute of Electrical Electronics Engineers)
- IEEE 802.11/ IEEE 802.11b
- MIB (Management Information Base)
- SNMP (Simple Network Management Protocol)
- Diversity
- Router
- Bridge
- LAN (Local Area Network)
- RSSI (Receive Signal Strength Indication)
- Spectrum diffusion transmission
- DS (Direct Sequence)
- CSMA/CA (Carrier Sense Multiple Access with Collision Avoidanc...
- Hidden Terminal Problem
- RTS (Request to Send)
- Roaming
- Peer-To-Peer
- AP (Access Point)
- User Unit
- ESS ID (Extended Service Set ID)
- Channel
- _
- Index
Spanning Tree Algorithms (STA)
FX-DS110-APL
39
STA Parameters
STA's function on two levels, bridge level and port level. Multiple
timers are used to periodically check the proper operation of
bridges and ports. The following section describes the parameters
and terms used in this product.
Bridge Level
Root Bridge
First, the bridge is determined using the bridge identifier (bridge
priority level and Ethernet address) of the bridge. The bridge
identifier of the root bridge is the smallest.
If more than one bridge exists with the same priority level, the root
bridge is determined by Ethernet address.
Designated Bridges
In each LAN segment, the bridge having the lowest root path cost
to the root bridge is the designated bridge. The designated bridge
serves to carry the packages of that LAN segment.
If more than one bridge is connected to the same LAN segment, and
the root path costs are exactly the same, the bridge with the smallest
bridge identifier becomes the designated bridge.
Bridge Priority
The priority level can be set in the range 0 to 65535. The smaller
this number, the higher the priority. If priorities are changed, all
bridges and root bridges in the network will be re-determined.
Root Path Cost
The total path cost from the designated bridge to the root bridge is
the root path cost. The root path cost of the root bridge is zero.
BPDU Effective Time (Max Age Time)
Set in the range from 6 to 40 (seconds). If the bridge does not
receive a packet notifying the existence of a root bridge within this
time, the system assumes there is a failure in the root bridge, and
determines a new root bridge.