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Spanning Tree Algorithm Configuration
121
NXA-ENET24 - Software Management Guide
Configuring Interface Settings - Web
Click Spanning Tree, STA Port Configuration or STA Trunk Configuration. Modify the required attributes,
then click Apply.
Command Attributes (Cont.)
•Priority: Defines the priority used for this port in the Spanning Tree Protocol. If the path cost for
all ports on a switch are 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 Protocol is detecting network loops.
Where more than one port is assigned the highest priority, the port with lowest numeric
identifier will be enabled.
• Default: 128
• Range: 0-240, in steps of 16
• Path Cost: This parameter is used by the STP to determine the best path between devices. There-
fore, lower values should be assigned to ports attached to faster media, and higher val-
ues assigned to ports with slower media. (Path cost takes precedence over port priority.)
Note that when the Path Cost Method is set to short (page 330), the maximum path cost
is 65,535.
• Range:
• Ethernet: 200,000-20,000,000
• Fast Ethernet: 20,000-2,000,000
• Gigabit Ethernet: 2,000-200,000
• Default:
• Ethernet – Half duplex: 2,000,000; full duplex: 1,000,000; trunk: 500,000
• Fast Ethernet – Half duplex: 200,000; full duplex: 100,000; trunk: 50,000
• Gigabit Ethernet – Full duplex: 10,000; trunk: 5,000
• 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. (This is the default setting.)
• Admin Edge Port
(Fast Forwarding):
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 workstations
or servers, retains the current forwarding database to reduce the amount of frame flood-
ing required to rebuild address tables during reconfiguration events, does not cause the
spanning tree to initiate reconfiguration when the interface changes state, and also over-
comes other STA-related timeout problems. However, remember that Edge Port should
only be enabled for ports connected to an end-node device. (Default: Disabled)
•Migration: If at any time the switch detects STP BPDUs, including Configuration or Topology
Change Notification BPDUs, it will automatically set the selected interface to forced
STP-compatible mode. However, you can also use the Protocol Migration button to
manually re-check the appropriate BPDU format (RSTP or STP-compatible) to send on
the selected interfaces.
• Default: Disabled
FIG. 125
Web - Configuring Spanning Tree per Port