Configuring Spanning Tree (G350 Only); Spanning Tree Overview; Spanning Tree Protocol - Avaya G250 Administration

Configuring advanced switching

Configuring spanning tree (G350 only)

This section provides information about configuring spanning tree on the G350 and contains the
following topics:

Spanning tree overview

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Spanning tree CLI commands
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spanning tree protocol on the G350
Spanning tree configuration examples
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configurations
Note:
Spanning tree is not supported on the G250.
Note:
Spanning tree overview
G350 devices support the enhanced Rapid Spanning Tree protocol (802.1w). The 802.1w
standard is a faster and more sophisticated version of the 802.1d (STP) standard, and includes
backward compatibility with 802.1d. Spanning Tree makes it possible to recover connectivity
after an outage within a minute or so. RSTP, with its "rapid" algorithm, can usually restore
connectivity to a network where a backbone link has failed in much less time.

Spanning tree protocol

The Spanning Tree Algorithm ensures the existence of a loop-free topology in networks that
contain parallel bridges. A loop occurs when there are alternate routes between hosts. If there is
a loop in an extended network, bridges may forward traffic indefinitely, which can result in
increased traffic and degradation in network performance.
The Spanning Tree Algorithm:
Produces a logical tree topology out of any arrangement of bridges. The result is a single
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path between any two end stations on an extended network.
Provides a high degree of fault tolerance. It allows the network to automatically reconfigure
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the spanning tree topology if there is a bridge or data-path failure.
The Spanning Tree Algorithm requires five values to derive the spanning tree topology. These
are:
A multicast address specifying all bridges on the extended network. This address is
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media-dependent and is automatically determined by the software.
A network-unique identifier for each bridge on the extended network.
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A unique identifier for each bridge/LAN interface (a port).
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232 Administration for the Avaya G250 and Avaya G350 Media Gateways
— an overview of spanning tree protocol
— a list and description of CLI commands used to configure
— examples of spanning tree protocol