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Figure 32 Relationship between a node, link and channel
Link
C
ha
nnel
1
Chan
n
e
l
2
Packet sending modes
IPC supports three packet sending modes: unicast, multicast (broadcast is considered as a special
multicast), and mixcast, each having a queue. The upper layer application modules can select one as
needed.
• Unicast—Packet sending between two single nodes.
• 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 nodes in the multicast group.
An application can create multiple multicast groups. The creation and deletion of a multicast group
and multicast group members depend on the application module.
• Mixcast—Both unicast and multicast are supported.
Enabling IPC performance statistics
When IPC performance statistics is enabled, the system collects statistics for packet sending and receiving
of a node in a specified time range, for example, in the past 10 seconds, or in the past 1 minute. When
IPC performance statistics is disabled, statistics collection is stopped. At this time, if you execute the
display command, the system displays the statistics information at the time when IPC performance
statistics was disabled.
To enable IPC performance statistics:
To do… Use the command… Remarks
Enable IPC performance statistics
ipc performance enable { node
node-id | self-node } [ channel
channel-id ]
Required
Disabled by default
Available in user view
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