Allied Telesis AT-S79 manual Point-to-Point Ports

Chapter 9: Rapid Spanning Tree Protocol (RSTP)

There are two possible selections:

ˆPoint-to-point port

ˆEdge 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 26 illustrates two AT-GS950/24 switches that have been connected with one data link. With the link operating in full-duplex, the ports are point- to-point ports.

AT-GS950/2424-Port 10/100/1000Mbps + 2 SFP Combo WebSmart Switch
	1	3	5	7	9	11	13	15	17	19	21	23
												SPEED
												LINK/ACT
												SPEED
												LINK/ACT		LINK/ACT
POWER	2	4	6	8	10	12	14	16	18	20	22	24	23	24
														732
														Point-to-Point Ports
														(Full-duplex Mode)
AT-GS950/2424-Port 10/100/1000Mbps + 2 SFP Combo WebSmart Switch
	1	3	5	7	9	11	13	15	17	19	21	23
												SPEED
												LINK/ACT
												SPEED
												LINK/ACT		LINK/ACT
POWER	2	4	6	8	10	12	14	16	18	20	22	24	23	24
														732

Figure 26. 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 27 illustrates an edge port on an AT-GS950/24 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.

112 Section I: Using the Menus Interface