SRX1400, SRX3400, and SRX3600 Services Gateway Module Overview
The modules described in this guide let you upgrade and customize your SRX1400,
SRX3400, or SRX3600 Services Gateway to suit the needs of your network. The following
types of modules are available for the SRX1400, SRX3400, and SRX3600 Services
Gateways:
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I/O cards (IOCs) are common form-factor module (CFM) cards that provide additional
physical network connections to the services gateway to supplement the Ethernet
ports on the Switch Fabric Board (SFB). Their primary function is to deliver data packets
arriving on the physical ports to the Network Processing Card (NPC) and to forward
data packets out the physical ports after services processing.
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Network Processing I/O Cards (NP-IOCs) are IOCs that have their own network
processing units (NPUs), so that traffic traversing the IOC does not have to traverse
the services gateway bus to a remote NPC. This feature makes them well-suited to
low-latency applications.
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Services Processing Cards (SPCs) are CFM cards that provide the processing power
to run integrated services such as firewall, IPsec, and IDP. All traffic traversing the
services gateway is passed to an SPC to have service processing applied to it. Traffic
is intelligently distributed by NPCs to SPCs for service processing, including session
setup based on policies, fast packet processing for packets that match a session,
encryption and decryption, and IKE negotiation.
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NPCs are CFM cards that receive inbound traffic from the IOCs and direct it to the
appropriate 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 buffers incoming traffic and queues outgoing traffic, and also 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.
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The Routing Engine is a PowerPC platform that runs the Junos operating system (Junos
OS). Unlike other modules, the Routing Engine is not in the CFM form factor, and so
has an assigned slot within the chassis (RE0). Software processes that run on the
Routing Engine maintain the routing tables, manage the routing protocols used on the
services gateway, control the services gateway interfaces, control some chassis
components, and provide the interface for system management and user access to
the services gateway.
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The SRX Clustering Module (SCM) is a card that you can install in the services gateway
to enable the dual control link feature for chassis cluster supported in Junos OS Release
10.2 and later. Unlike other modules, the SCM is not in the CFM form factor, and so has
an assigned slot within the chassis (RE1).
Related
Documentation
Modules Supported on SRX1400, SRX3400, and SRX3600 Services Gateways on
page 3
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• Eligible Slots for SRX1400, SRX3400, and SRX3600 Services Gateway Modules on
page 4
Copyright © 2016, Juniper Networks, Inc.2
SRX1400, SRX3400, and SRX3600 Services Gateway Module Guide