Nortel Networks Optivity Switch Manager for LAN Switch Networks Release 1.0.0.0

Spanning Tree Protocol

As defined in the IEEE 802.1D standard, the Spanning Tree Protocol detects and eliminates logical loops in a bridged or switched network. When multiple paths exist, the spanning tree algorithm configures the network so that a bridge or switch uses only the most efficient path. If that path fails, the protocol automatically reconfigures the network to make another path active, thus sustaining network operations.

The collection of ports in one spanning tree is called a spanning tree group (STG) and a network may include multiple instances of STP. All the devices supported by Optivity Switch Manager support at least one STG. The Passport 1000 Series switch and the Passport 8600 modules support multiple spanning trees, thus multiple spanning tree groups.

The following table lists the maximum number of STGs and VLANs supported by the different products.

• Networking Concepts for the Accelar 1000 Series Routing Switch Release 2.0
• Networking Concepts for the Passport 8000 Series Routing Switch