Allied Telesis AT-S39 - Manual (Page 102)

Section II: Local and Telnet Management
102
The root bridge will periodically transmit a BPDU to determine whether
there have been any changes to the network topology and to inform
other bridges of topology changes. The frequency with which the root
bridge sends out a BPDU is called the Hello Time. This is a value that you
can set on the AT-8000 Series switch. The interval is measured in seconds
and the default is 2 seconds. Consequently, if an AT-8000 Series switch is
selected as the Root Bridge of a spanning tree domain, it will transmit a
BPDU every two seconds.
Point-to-Point Ports 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 port type
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
❑ Edge port
If a bridge port is operating in full-duplex mode, than the port is
functioning as point-to-point. Figure 24 illustrates two AT-8024 switches
that have been interconnected with one data link. With the link
operating in full-duplex, the ports are said to be point-to-point ports.
Figure 24 Point-to-Point Ports
Link
Mode
Link
Mode
100
FULL
ACT
MODE
COL
FAULT
MASTER
PWR
AT-8024
10Base-T / 100Base-TX Fast Ethernet Switch RS-232 TERMINAL PORT
Link
Mode
Link
Mode
100
FULL
ACT
MODE
COL
FAULT
MASTER
PWR
AT-8024
10Base-T / 100Base-TX Fast Ethernet Switch RS-232 TERMINAL PORT
Point-to-Point Ports
(Full-duplex Mode)