163Figure 56 Relationship between a node, link and channelLinkChannel 1Channel 2Packet sending modesIPC supports three packet sending modes: unicast, multicast (broadcast is considered as a specialmulticast), and mixcast, each having a queue. The upper layer application modules can select a packetsending mode as needed.• Unicast: packet sending between two single nodes.• Multicast: packet sending between a single node and multiple nodes. To use multicast mode, amulticast 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 a multicastgroup and multicast group members depend on the application module.• 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, if youexecute the display command, the system displays the statistics information at the time that IPCperformance statistics was disabled.Follow these steps to enable IPC performance statistics:To do… Use the command… RemarksEnable IPCperformance statisticsipc performance enable { node node-id |self-node } [ channel channel-id ]RequiredDisabled by defaultAvailable in user view
