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Central Point and Combo Mode Support

The central point (CP) in the architecture has two basic flow functionalities: load balancing and traffic identification (global session matching). The central point forwards a packet to its Services Processing Unit (SPU) upon session matching, or distributes traffic to an SPU for security processing if the packet does not match any existing session.

An SPU dedicated to central point functionality is called a large central point. However, when such a dedicated SPU is not affordable, you can configure the SPU to perform normal flow processing as well as the functions of the central point. When an SPU functions in such a dual manner, it is said to be in combination or combo-mode. In combo-mode, the central point and SPU share the same load-balancing thread (LBT) and packet-ordering thread (POT) infrastructure. SRX 3400 and SRX 3600 devices always support combo-mode.

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