Multiple Instance Spanning-Tree Operation

Configuring MSTP

Syntax: spanning-tree < port-list> path-cost < auto 1..200000000 >

Assigns an individual port cost that the switch uses to determine which ports are forwarding ports in a given spanning tree. In the default configuration ( auto ) the switch determines a port’s path cost by the port’s type:

10 Mbps: 2000000

100 Mbps: 200000

1 Gbps: 20000

Refer to “Note on Path Cost” on page 4-17 for information on compatibility with devices running 802.1D STP for the path cost values

(Default: Auto).

Syntax: spanning-tree < port-list> point-to-point-mac < true false auto >

This parameter informs the switch of the type of device to which a specific port connects.

true (default): Indicates a point-to-point link to a device such as a switch, bridge, or end-node.

false: Indicates a connection to a hub (which is a shared LAN segment).

auto: Causes the switch to set Force-False on the port if it is not running at full duplex. (Connections to hubs are half-duplex.)

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