28-2Data of an upper layer application module is sent to the IPC module through a channel, and the IPCmodule sends the data to a peer node through the link. The relationship between a node, link andchannel is as shown in Figure 28-1.Figure 28-1 Relationship between a node, link and channelNode 1IPCApplication 2Application 3Application 1Node 2IPCApplication 2Application 3Application 1Channel 1Channel 2Packet sending modesIPC supports three packet sending modes: unicast, multicast (broadcast is considered as a specialmulticast), and mixcast, each having a corresponding queue. The upper layer application modules canselect one as needed.z Unicast: packet sending between two single nodes.z Multicast: packet sending between a single node and multiple nodes. To use the multicast mode,a multicast group needs to be created first. Multicasts will be sent to all the nodes in the multicastgroup. An application can create multiple multicast groups. The creation and deletion of amulticast group and multicast group members depend on the application module.z Mixcast, namely, both unicast and multicast are supported.Enabling IPC Performance StatisticsWhen IPC performance statistics is enabled, the system collects statistics for packet sending andreceiving of a node in a specified time range (for example, in the past 10 seconds, or in the past 1minute). When IPC performance statistics is disabled, statistics collection is stopped. At this time, ifyou execute the display command, the system displays the statistics information at the time when IPCperformance statistics was disabled.Follow these steps to enable IPC performance statistics:To do… Use the command… RemarksEnable IPC performancestatisticsipc performance enable{ node node-id | self-node }[ channel channel-id ]RequiredDisabled by defaultAvailable in user view
