IBM Power Systems 775 Manual page 85

CNM CNM
DB DB Route Route
Thread Thread Thread Thread
R R R A A A R R R
Async Async Async Async Async Async
Respo nse Respo nse Respo nse Response Response Response
DB DB DB Routing Routing Routing
Queue Queue Queue Queue Queue Queue
R R
R R
A A
CNM – Hdwr_Svr socket CNM – Hdwr_Svr socket
Figure 1-55 CNM software structure
Communication layer
This layer provides a packet library with methods for communicating with LNMC. The layer
manages incoming and outgoing messages between FSPs and CNM component message
queues.
The layer also manages event aggregation and the virtual connections to the Hardware
Server.
Database component
This component maintains the CNM internal network hardware database and updates the
status fields in this in-memory database to support reporting the status to the administrator.
The component also maintains required reachability information for routing.
Routing component
This component builds and maintains the hardware multicast tree. The component also writes
multicast table contents to the ISR and handles the exchange of routing information between
the LNMCs to support route generation and maintenance.
Global counter component
This component sets up and monitors the hardware global counter. The component also
maintains information about the location of the ISR master counter and configured backups.
TEAL TEAL
Error Log Error Log
Thread Thread
Recovery Recovery Diags Diags
Thread Thread Thread Thread
A A A R R R A A A R R R
Async Async Async Async Async Async
Response Response Response Response Response Response
Recovery Recovery Recovery Diagnostic Diagnostic Diagnostic
Queue Queue Queue Queue Queue Queue
Outbound Outbound
Queue Queue
R R
A A
Communications Layer Communications Layer
Hardware Server Hardware Server
Chapter 1. Understanding the IBM Power Systems 775 Cluster
NM Command Exec NM Command Exec
Cmd Cmd GC GC
Thread Thread Thread Thread
A A A R R R A A A R R R
Async Async Async
Response Response Response Response Response Response
Command Command Command
Queue Queue Queue
R R
R R
R R
A A
A A
A A A
Async Async Async
GC GC GC
Queue Queue Queue
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