Linksys SGE2000 Cisco Small Business SFE/SGE2xxx Series Managed Switches Admin - Page 267
Defining Rapid Spanning Tree, Priority, Designated Bridge ID, Forward Transitions, Blocking
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Configuring Spanning Tree Defining Spanning Tree 10 • Priority - Priority value of the port. The priority value influences the port choice when a bridge has two ports connected in a loop. The priority value is between 0 -240. The priority value is provided in increments of 16. • Designated Bridge ID - Indicates the bridge priority and the MAC Address of the designated bridge. • Designated Port ID - Indicates the selected port's priority and interface. • Designated Cost - Indicates the cost of the port participating in the STP topology. Ports with a lower cost are less likely to be blocked if STP detects loops. • Forward Transitions - Indicates the number of times the port has changed from the Blocking state to Forwarding state. • LAG - Indicates the LAG to which the port belongs. If a port is a member of a LAG, the LAG settings override the port settings. STEP 3 Define the relevant fields. STEP 4 Click Apply. The interface settings are modified, and the device is updated. 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. Cisco Small Business SFE/SGE Managed Switches Administration Guide 258