HP 7000 dl Router manual Spanning-tree link-type auto point-to-point shared, Auto, Shared

SROS Command Line Interface Reference Guide Ethernet Interface Configuration Command Set

spanning-tree link-type [auto point-to-point shared]

Use the spanning-treelink-typecommand to configure the spanning tree protocol link type for each interface. Use the no version of the command to return to the default setting.

Syntax Description

auto	Link type is determined by the port’s duplex settings.
point-to-point	Link type is manually set to point-to-point, regardless of duplex settings.
shared	Link type is manually set to shared, regardless of duplex settings.

Default Values

By default, the interface is set to auto.

Command Modes

(config-interface)#	Interface Configuration Mode
	Valid interfaces include: Ethernet, virtual PPP interfaces (ppp 1), virtual Frame
	Relay sub-interfaces (fr 1.20), and atm sub-interfaces (1.2).

Functional Notes

This command overrides the default link type setting determined by the duplex of the individual port. By default, a port configured for half-duplex is set to shared link type, and a port configured for full-duplex is set to point-to-pointlink type. Setting the link type manually overrides the default and forces the port to use the specified link type. Using the link-type auto command, restore the convention of determining link type based on duplex settings.

Usage Examples

The following example forces the link type to point-to-point, even if the port is configured to be half-duplex:

(config)#interface eth 0/1

(config-eth0/1)#spanning-tree link-type point-to-point

Technology Review

Rapid transitions are possible in RSTP (rapid spanning-tree protocol) by taking advantage of point-to-point links (a port is connected to exactly one other bridge) and edge-port connections (a port is not connected to any additional bridges). Setting the link-type to auto allows the spanning-tree to automatically configure the link type based on the duplex of the link. Setting the link type to point-to-pointallows a half-duplex link to act as if it were a point-to-point link.

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