163
Figure 56
Relationship between a node, link and channel
Link
Cha
nne
l 1
Cha
nn
el 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 a packet
sending mode as needed.
•
Unicast: packet sending between two single nodes.
•
Multicast: packet sending between a single node and multiple nodes. To use multicast mode, a
multicast group needs to be created first. Multicasts will be sent to all the 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, namely, 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 that IPC
performance statistics was disabled.
Follow these steps 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