Allied Telesis AT-S63 - Manual (Page 522)

Chapter 22: Spanning Tree and Rapid Spanning Tree Protocols
522 Section V: Spanning Tree Protocols
If a port is operating in half-duplex mode and is not connected to any
further bridges participating in STP or RSTP, then the port is an edge port.
Figure 167 illustrates an edge port on an AT-9400 switch. The port is
connected to an Ethernet hub, which in turn is connected to a series of
Ethernet workstations. This is an edge port because it is connected to a
device operating at half-duplex mode and there are no participating STP
or RSTP devices connected to it.
Figure 167. Edge Port
A port can be both a point-to-point and an edge port at the same time. It
operates in full-duplex and has no STP or RSTP devices connected to it.
Figure 168 illustrates a port functioning as both a point-to-point and edge
port.
Figure 168. Point-to-Point and Edge Port
Determining whether a bridge port is point-to-point, edge, or both, can be
a bit confusing. For that reason, do not change the default values for this
RSTP feature unless you have a good grasp of the concept. In most
cases, the default values work well.
Edge Port
FAULT
RPS
MASTER
POWER
CLASS 1 LASER PRODUCT STATUS TERMINAL
PORT
1 3 5 7 9 11
2 4 6 8 10 12
13 15 17 19 21 23R
14 16 18 20 22 24R
AT-9424T/SP Gigabit Ethernet Switch
1 3 5 7 9 11 13 15 17 19 21 23R
2 4 6 8 10 12 14 16 18 20 22 24R
23 24
L/A
D/C
D/C
L/A
D/C
L/A 1000 LINK / ACT
HDX / COL FDX
10/100 LINK / ACT
PORT ACTIVITY
L/A
1000 LINK / ACT SFP SFP
24
SFP
23
8 7 6 5 4 3 2 1 8 7 6 5
4 3 2 1
Point-to-Point and Edge Port
FAULT
RPS
MASTER
POWER
CLASS 1 LASER PRODUCT STATUS TERMINAL PORT
1 3 5 7 9 11
2 4 6 8 10 12
13 15 17 19 21 23R
14 16 18 20 22 24R
AT-9424T/SP Gigabit Ethernet Switch
1 3 5 7 9 11 13 15 17 19 21 23R
2 4 6 8 10 12 14 16 18 20 22 24R
23 24
L/A
D/C
D/C
L/A
D/C
L/A 1000 LINK / ACT
HDX / COL FDX
10/100 LINK / ACT PORT ACTIVITY
L/A
1000 LINK / ACT SFP SFP
24
SFP
23
Workstation
(Full-duplex Mode)