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AT-S63 Management Software Features Guide
Section V: Spanning Tree Protocols 221
seconds and the default is two seconds. Consequently, if the AT-9400
Switch is selected as the root bridge of a spanning tree domain, it
transmits a BPDU every two seconds.
Point-to-Point
and Edge Ports
Note
This section applies only to RSTP.
Part of the task of configuring RSTP is defining the port types on the
bridge. This relates to the device(s) connected to the port. With the port
types defined, RSTP can reconfigure a network much quicker than STP
when a change in network topology is detected.
There are two possible selections:
Point-to-point port
Edge port
If a bridge port is operating in full-duplex mode, than the port is functioning
as a point-to-point port. Figure 21 illustrates two AT-9400 Switches that
are connected with one data link. With the link operating in full-duplex, the
ports are point-to-point ports.
Figure 21. Point-to-Point Ports
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 22 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.
Point-to-Point Ports
(Full-duplex Mode)
FAULT
RPS
MASTER
POWER
CLASS 1
LASER PRODUCT
STATUS
TERMINAL
PORT
1357911
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 2123R
2 4 6 8 1012 1416 1820 2224R
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
FAULT
RPS
MASTER
POWER
CLASS 1
LASER PRODUCT
STATUS
TERMINAL
PORT
1357911
2 4 6 8 10 12
13 15 17 19 21 23R
14 16 18 20 22 24R
AT-9424T/SP
Gigabit Ethernet Switch
1357911131517192123R
2 4 6 8 1012 1416 1820 2224R
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