Cisco SGE2000 Reference Guide - Page 172
Defining Rapid Spanning Tree, Bridging, Spanning Tree, Ports, Of Unit, Interface
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10 Chapter SGE2000/SGE2000P Gigabit Ethernet Switch Reference Guide Defining Rapid Spanning Tree While the classic spanning tree prevents Layer 2 forwarding loops in a general network topology, convergence can take between 30-60 seconds. This time may delay detecting possible loops, and propagating status topology changes. Rapid Spanning Tree Protocol (RSTP) detects and uses network topologies that allow a faster STP convergence without creating forwarding loops. 1. Click Bridging > Spanning Tree > RSTP. The RSTP Page opens: RSTP Page The RSTP Page contains the following fields: • Ports - Indicates the port number on which RSTP is configured. • LAGs - Indicates the LAG number on which RSTP is configured. • Of Unit - Displays the stacking member for which the RSTP parameters are displayed. • Interface - Displays the port or LAG on which Rapid STP is enabled. • Role - Indicates the port role assigned by the STP algorithm in order to provide to STP paths. The possible field values are: - Root - Provides the lowest cost path to forward packets to root switch. - Designated - Indicates that the port or LAG via which the designated switch is attached to the LAN. 164 Chapter 10: Configuring Spanning Tree Defining Rapid Spanning Tree