Chapter 8 Advanced Configuration for Compex CGX3224
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Chapter 8 Advanced Configuration for Compex CGX3224
In this chapter, you can understand how the configuration on Spanning Tree Protocol (STP) can
be easily done. Compex CGX3224 implements Internet Group Multicast Protocol (IGMP)
function which forwards multicast traffic intelligently. Simple Network Management Protocol
(SNMP) is also introduced to provide a standard mechanism to monitor and control network
devices.
8.1 STP Configuration
Spanning Tree Protocol, designed to run on bridges and switches, is a link management
protocol that provides path redundancy while preventing undesirable loops in the
network. The main purpose of STP is to ensure that the system do not run in looping
situation when it has redundant paths in your 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. STP should be
used in situation where you want redundant links but not loops. If your primary system
fails, the backup links are activated so that users can continue using the network.
Without STP on the bridges or switches, such a situation may result in a loop.
The example shown in Figure 8.1a illustrates a redundant link between Compex
CGX3224 Unit #1 and #2. The probability of having a bridging loop is quite high. This
is because, a broadcast or multicast packets might be circulating repeatedly between
CGX3224 Unit #1 and #2.
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