Allied-telesis AT 8000/8POE User Manual download pdf (Page 158)

Chapter 12: Rapid Spanning Tree Protocol (RSTP)

158 Section I: Using the Menus Interface

Point-to-Point and Edge Ports

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 quickly reconfigure a network when a change in

network topology is detected.

There are two possible selections:

 Point-to-point port

 Edge port

The default setting for the RSTP port point-to-point status is automatic.

With the automatic setting, the point-to-point status is True of the port is

operating in full-duplex mode. If the port is operating in half-duplex mode,

then the point-to-point status is False.

Figure 39 illustrates two AT-8000/8POE Fast Ethernet switch that have

been connected with one data link. With the link operating in full-duplex,

the ports are point-to-point ports.

Figure 39. 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 you need to manually

define the port as an edge port. The default setting for the edge port status

is False. You must manually configure this setting for each port. There is

no automatic mode for the edge port setting. Figure 40 illustrates an edge

port on an AT-8000/8POE Fast Ethernet 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.

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Allied-telesis AT 8000/8POE User Manual Page 158