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Chapter 7 Advanced Configuration for Compex SGX3226

In this chapter, you can understand how the configuration on Spanning Tree Protocol (STP) was easily done. Compex SGX3226 implements Internet Group Multicast Protocol (IGMP) function which forwards multicast traffic intelligently. In fact, Simple Network Management Protocol (SNMP) is also introduced to provide a standard mechanism to monitor and control network devices.

7.1STP Config

Spanning Tree Protocol is a link management protocol that provides path redundancy while preventing undesirable loops in the network. For an Ethernet network to function properly, only one active path can exist between two stations.

Multiple active paths between stations cause loops in the network. If a loop exists in the network topology, the potential exists for duplication of messages. When loops occur, some switches see stations appear on both sides of the switch. This condition confuses the forwarding algorithm and allows duplicate frames to be forwarded.

7.1.1STP Port

When Compex SGX3226 first powers up, all bridges will declare themselves to be the root. The one with the lowest priority will be the root. The bridges will stop advertising themselves and use the BPDUs of the root bridge.

During normal operation for Compex SGX3226, the ports are either forwarding or disabling.

In a forwarding state, the network can send and receive frames which takes about 50 seconds for a port to go from disabling to forwarding.

In a blocking state, the port is not forwarding frames, but will receive the BPDUs.

Active ports which can forward frames on the root bridge are known as designated ports.