H3C Technologies H3C SecBlade LB Cards - Manual (Page 93)

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Configuring IPC
This chapter provides an overview of Inter-Process Communication (IPC) and describes the IPC
monitoring commands.
IPC can be configured only at the CLI.
Overview
IPC provides a reliable communication mechanism among processing units, typically CPUs. This section
describes the basic IPC concepts.
Node
An IPC node is an independent IPC-capable processing unit, typically, a CPU. One LB product is one IPC
node, because it has only one CPU.
Link
An IPC link is a connection between any two IPC nodes. Any two IPC nodes have one and only one IPC
link for sending and receiving packets. All IPC nodes are fully meshed.
IPC links are created when the system is initialized. An IPC node, upon startup, sends handshake packets
to other nodes. If the handshake succeeds, a connection is established.
The system uses link status to identify the link connectivity between two nodes. An IPC node can have
multiple links, and each link has its own status.
Channel
A channel is the communication interface between peer upper layer application modules that use
different IPC nodes. Each node assigns a locally unique channel number to each upper layer application
module for identification.
An upper layer application module sends data to an IPC module across a channel, and the IPC module
sends the data to a peer node across a link, as shown in Figure 41 .