H3C Technologies H3C SR8800 - Manual (Page 104)

92
Figure 34 Relationship between a node, link and channel
Packet sending modes
IPC supports three packet sending modes: unicast, multicast (including broadcast, a special multicast),
and mixcast, each having a corresponding queue. The upper layer application modules can select one
as needed.
• Unicast—One node sends packets to another node.
• Multicast—One node sends packets to multiple nodes. To use multicast mode, an application
module must create a multicast group that includes a set of nodes. Multicasts destined for this group
are sent to all the nodes in the group. An application module can create multiple multicast groups.
Creation and deletion of a multicast group and multicast group members depend on the
application module.
• Mixcast—Supports both unicast and multicast.
Enabling IPC performance statistics
When IPC performance statistics is enabled, the system collects input and output statistics for a node in
a specified time range (for example, in the last 10 seconds, or in the last 1 minute). When IPC
performance statistics is disabled, statistics collection is stopped. If you execute the display command,
the system displays the statistics at the time when IPC performance statistics was disabled.
To enable IPC performance statistics:
Task Command Remarks
Enable IPC performance statistics
in user view.
ipc performance enable { node
node-id | self-node } [ channel
channel-id ]
By default, the function is disabled.