AMX NXA-ENET24 manual Ing network loops, Numeric identifier will be enabled

Spanning Tree Algorithm Configuration

Command Attributes (Cont.)

•Port Role (Cont.) The role is set to disabled (i.e., disabled port) if a port has no role within the spanning tree.

Alternate port receives more			R: Root Port
useful BPDUs from another			A: Alternate Port
bridge and is therefore not			D: Designated Port
selected as the designated			B: Backup Port
port.	R		R
	A	D	B

x

Backup port receives more useful BPDUs from the same bridge and is therefore not selected as the designated

port.

RR

AD B

x

•Trunk Member: Indicates if a port is a member of a trunk. (STA Port Information only) These additional parameters are only displayed for the CLI:

•Admin Status: Shows if this interface is enabled.

•Path Cost:This parameter is used by the STA to determine the best path between devices. Therefore, lower values should be assigned to ports attached to faster media, and higher values assigned to ports with slower media. (Path cost takes precedence over port priority.)

• Priority:	Defines the priority used for this port in the Spanning Tree Algorithm. If the path cost
	for all ports on a switch is the same, the port with the highest priority (i.e., lowest
	value) will be configured as an active link in the Spanning Tree. This makes a port
	with higher priority less likely to be blocked if the Spanning Tree Algorithm is detect-
	ing network loops.
	Where more than one port is assigned the highest priority, the port with lowest
	numeric identifier will be enabled.

•Designated root: The priority and MAC address of the device in the Spanning Tree that this switch has accepted as the root device.

•Fast forwarding: This field provides the same as Admin Edge port, and is only included for backward compatibility with earlier products.

•Admin Edge Port: You can enable this option if an interface is attached to a LAN segment that is at the end of a bridged LAN or to an end node. Since end nodes cannot cause forwarding loops, they can pass directly through to the spanning tree forwarding state.

Specifying Edge Ports provides quicker convergence for devices such as worksta- tions or servers, retains the current forwarding database to reduce the amount of frame flooding required to rebuild address tables during reconfiguration events, does not cause the spanning tree to initiate reconfiguration when the interface changes state, and also overcomes other STA-related timeout problems. However, remember that Edge Port should only be enabled for ports connected to an end-node device.

•Admin Link Type: The link type attached to this interface.

•Point-to-Point – A connection to exactly one other bridge.

•Shared – A connection to two or more bridges.

•Auto – The switch automatically determines if the interface is attached to a point- to-point link or to shared media.

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