Chapter 7 Advanced Configuration For Compex Sgx3226 - Compex SGX3226 User Manual

Chapter 7 Advanced Configuration for Compex SGX3226
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.
7.1 STP 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.
7.1.1 STP 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 disabling 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.
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