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SRX3600 Services Gateway NPCs


Network Processing Cards (NPCs) are common form-factor module (CFM) cards that receive inbound traffic from I/O cards (IOCs) and direct it to the appropriate Services Processing Card (SPC) for processing. Once services processing is complete, the NPC receives outbound traffic from the SPC(s) and directs it back to the appropriate IOC. Additionally, the NPC performs the following functions:

  • Buffers incoming traffic and queues outgoing traffic.

  • Performs advanced traffic management, including DoS/DDoS protective measures. For example, it can drop traffic to or from a particular IP address, protecting from ICMP, UDP, and TCP SYN flooding, and buffering bursty traffic to protect the Services Processing Card (SPC).

Figure 1: Typical NPC
Typical NPC

For detailed information about the NPCs supported by the services gateway, see the SRX1400, SRX3400, and SRX3600 Services Gateway Module Guide   at