Allied Telesis AT-S25 - Manual (Page 99)

AT-S25 Management Software User’s Guide
99
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 32 illustrates an edge port on an AT-8324 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 32 Edge Port
A port can be both point-to-point and edge at the same time. It would
operate in full-duplex and have no STP or RSTP devices connected to it.
Figure 33 illustrates a port functioning both as point-to-point and edge.
Figure 33 Point-to-Point and Edge Point
Determining whether a bridge port is point-to-point, edge, or both, can
be a bit confusing. For that reason it might be best not to change the
default values for this RSTP feature unless in have a good grasp of the
concept. In most cases, the default values will work fine.
Note
If you are sure that there are RSTP participating bridges attached to
a particular port, you should set that port’s edge port status to ‘NO’
to prevent possible bridge loops.
STATUS
RESET
FAULT
MASTER RPS PWR
10BASE-T / 100BASE-TX
FAST ETHERNET SWITCH
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
10BASE-T / 100BASE-TX
1X 3X 5X 7X
2X 4X 6X 8X
9X 11X 13X 15X
10X 12X 14X 16X
17X 19X 21X 23X
18X 20X 22X 24X
A
B
RS-232 TERMINAL PORT 100M LINK / ACTIVITY 10M LINK / ACTIVITY
HALF DUP/ COL FULL DUP
PORT ACTIVITY
L /A
L /A
D/C
D/C L /A D/C
Edge Port
5 4 3 2 1
6 7 8
Point-to-Point and Edge Port
Workstation
(Full-duplex Mode)
STATUS
RESET
FAULT MASTER RPS
PWR
10BASE-T / 100BASE-TX
FAST ETHERNET SWITCH
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
10BASE-T / 100BASE-TX
1X 3X 5X 7X
2X 4X 6X 8X
9X 11X 13X 15X
10X 12X 14X 16X
17X 19X 21X 23X
18X 20X 22X 24X
A
B
RS-232 TERMINAL PORT 100M LINK / ACTIVITY 10M LINK / ACTIVITY
HALF DUP/ COL FULL DUP
PORT ACTIVITY
L /A
L /A
D/C
D/C L /A
D/C