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10-21

Bridging—Transmitting Non-IP Traffic or Merging Two Networks

Configuring Spanning Tree

To enable Frame Relay and ATM subinterfaces to act as edge ports, move to

the logical interface configuration mode context and enter:

Syntax: spanning-tree edgeport

When the global setting defines all interfaces as edge ports by default, use the

no form of the command to disable the edgeport setting on the individual

subinterface.

You should consider implementing the BPDU guard on edge ports. End

devices should not participate in the spanning tree. However, a user running

software that implements STP or RSTP can join spanning tree and disrupt the

network. If the default priority setting on the user software is low, the end

device can even become the root. The BPDU guard prevents the router

interface from receiving BPDU messages from the end device. It also prevents

the interface from being connected to an unauthorized switch.

You configure the BPDU guard on an individual logical interface with this

command:

Syntax: spanning-tree bpduguard [enable | disable]

Use the enable option to activate the guard.

You can also configure the BPDU guard on all interfaces from the global

configuration mode context:

Syntax: spanning-tree edgeport bpduguard default

You can then override this setting for an individual interface by entering this

form of the command from the interface configuration mode context:

ProCurve(config-fr 1.1)# spanning-tree bpduguard disable

Configuring an Interface for a Point-to-Point Versus a Shared

Connection. RSTP must know whether an interface uses a point-to-point or

shared connection to implement sync.

Point-to-point interfaces use sync to rapidly transition from discarding to

forwarding frames. One interface sends a BPDU proposing that it become the

neighbor’s designated switch. If the neighbor agrees, both interfaces become

immediately active.

Interfaces on shared media, which reach more than one neighbor on the same

connection, cannot exchange sync BPDUs to activate a connection.

HP ProCurve 7000dl Series User Manual

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