Allied Telesis AT-S29 User Manual
Page 45
AT-S29 Management Software User’s Guide
45
Configuring STA for Ports or Modules
The following figure and table describe STA configuration for ports or
modules. (Note that the Spanning Tree Configuration screen for the
expansion slots also indicates module type.)
Spanning Tree Port Configuration: Unit 1 Port 1-12
==================================
Port
Type
Priority
Cost
----------------------------------------
1
10/100TX
128
5
2
10/100TX
128
19
3
10/100TX
128
19
4
10/100TX
128
19
5
10/100TX
128
19
6
10/100TX
128
19
7
10/100TX
128
19
8
10/100TX
128
19
9
10/100TX
128
19
10
10/100TX
128
19
11
10/100TX
128
19
12
10/100TX
128
19
Use
Parameter
Default
Description
Type
Shows port type as 10/100TX, 100FX, 1000SX or 1000LX.
Priority
128
Defines the priority for the use of a port in the STA algorithm. If the
path cost for all ports on a switch are the same, the port with the
highest priority (i.e., lowest value) will be configured as an active link
in the spanning tree. Where more than one port is assigned the
highest priority, the port with lowest numeric identifier will be
enabled. The range is 0 - 255.
(Path) Cost
100/19/4
This parameter is used by the STA algorithm to determine the best
path between devices. Therefore, lower values should be assigned to
ports attached to faster media, and higher values assigned to ports
with slower media.
The default and recommended range is:
Standard Ethernet: 100 (50~600)
Fast Ethernet: 19 (10~60)
Gigabit Ethernet: 4 (3~10)
The full range is 0 - 65535.
Note: Path cost takes precedence over port priority.