HP OfficeConnect Firewall Series Instrukcja Użytkownika Pobierz pdf (Strona 49)

OfficeConnect VPN Firewall User’s Manual Chapter 5. Configuring LAN Settings

7 Configuring Spanning Tree

Settings

7.1 Spanning Tree Overview

This section contains information for configuring STP. The Spanning Tree

Protocol (STP) provides tree topography for any arrangement of bridges. STP

also provides a single path between end stations on a network, eliminating

loops.

Loops occur when alternate routes exist between hosts. Loops in an extended

network can cause bridges to forward traffic indefinitely, resulting in increased

traffic and reducing network efficiency.

While Classic STP prevents Layer 2 forwarding loops in a general network

topology, convergence can take between 30-60 seconds. Rapid Spanning Tree

Protocol (RSTP) detects and uses network topologies that allow a faster STP

convergence without creating forwarding loops.

The device supports the following STP versions:

 Classic STP — Provide a single path between end stations, avoiding and

eliminating loops.

 Rapid STP — Detect and use network topologies that provide faster

convergence of the spanning tree, without creating forwarding loops. While

Classic STP prevents Layer 2 forwarding loops in a general network

topology, convergence can take between 30-60 seconds. Rapid Spanning

Tree Protocol (RSTP) detects and uses network topologies that allow a

faster STP convergence without creating forwarding loops.

7.2 Spanning Tree Configuration Parameters

Table 7.1 describes the configuration parameters available for VLAN

configuration.

Table 7.1 Spanning Tree Configuration Parameters

Setting

Description

System Priority

Specifies the bridge priority value. When switches or

bridges are running STP, each is assigned a priority.

After exchanging BPDUs, the device with the lowest

priority value be comes the Root Bridge. The field

range is 0-61440. The default value is 32768. The port

priority value is provided in increments of 4096.

Hello Time

Specifies the device Hello Time. The Hello Time

indicates the amount of time in seconds a Root Bridge

waits between configuration messages. The default is 2

seconds.

Max Age

Specifies the device Maximum Age Time. The

Maximum Age Time is the amount of time in seconds a

bridge waits before sending configuration messages.

The default Maximum Age Time is 20 seconds.

Forward Delay

Specifies the device Forward Delay Time. The Forward

Delay Time is the amount of time in seconds a bridge

remains in a listening and learning state before

forwarding packets. The default is 15 seconds.

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