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Spanning Tree Algorithm Configuration
3-85
• Trunk – Indicates if a port is a member of a trunk.
(STA Port Configuration only)
The following interface attributes can be configured:
• 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. 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.) Note that when the Path Cost Method
is set to short (page 3-63), 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 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. (Default: Disabled)