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Network Processing Card SRX3K-NPC


Network Processing Cards (NPCs) are CFMs that receive inbound traffic from the IOCs and direct it to the appropriate SPC for services 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 SPC.

Figure 1: Network Processing Card SRX3K-NPC
Network Processing Card SRX3K-NPC


  • NPC for SRX3400, SRX3600, and SRX1400

  • Power requirement: 64 W maximum

  • Weight: 2.2 lb (1.0 kg)

Software release

  • Junos OS Release 9.3 and later

Cables and connectors



ONLINE Button–The ONLINE button on the NPC front panel does not perform any function.

Supported Slots

  • SRX1400: Front slot labeled 3 when installed in conjunction with an SPC installed in slot 1.

  • SRX3400: Rear slots labeled 5 through 7.

  • SRX3600: Rear slots labeled 10 through 12.


NPCs are cold-swap-only modules. You must power-off the services gateway before removing, replacing, or adding NPCs.


SERVICE LED, one bicolor

  • Green–The NPC is mapped to an IOC and is actively carrying traffic.

  • Amber–The NPC is mapped to a IOC, but there is no SPC present or reachable in the system so all traffic is dropped.

  • Off–The NPC is not carrying traffic.

OK/FAIL LED, one bicolor

  • Steady Green–The NPC is operating normally.

  • Blinking Green–The NPC is preparing for hot-swap event.

  • Red–The NPC has failed and is not operating normally.

  • Off–The NPC is powered down.

Serial Number Location

The serial number label for the NPC is located as shown in Figure 2).

Figure 2: NPC Serial Number Label
NPC Serial Number Label