Cisco ASR 5000 series Product Overview page 678

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▀ Features and Functionality - Basic

Figure 165. SGSN NPU FastPath

FastPath is established when both ends of a tunnel are available. Two FastPath flows are established, one for the uplink

and one for the downlink direction for a given PDP context. FastPath will temporarily go down or be disengaged so that

packets temporarily do not move through FastPath when either an Intra-SGSN RAU or an Iu-Connection Release

If FastPath cannot be established, the NPU forwards the GTP-U packets to a CPU for processing and they are processed

like all other packets.

FastPath can not be established for subscriber PDP sessions if:

Traffic Policing & Shaping is enabled.

Subscriber Monitoring is enabled.

Lawful Intercept (LI) is enabled,

IP Source Violation Checks are enabled.

GTP-v0 tunnel is established with an GGSN.

For NPU fast path configuration, refer to Enabling NPU Fast Path for GTP-U Processing section of ―Service

Configuration Procedures‖ chapter of SGSN Administration Guide.

▄ Cisco ASR 5000 Series Product Overview

320 Gig switch

Serving GPRS Support Node (SGSN) Overview