Cisco ASR 5000 Series, Обзор продукта

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ASN Gateway Overview
Supported Features ▀
Cisco ASR 5000 Series Product Overview ▄
OL-22938-02
Multi-flow QoS enables the establishment of static traffic policies for various subscriber application level service flows.
It can be used in Simple IP or Mobile IP usage scenarios. The policies are stored in a Subscriber Policy Repository
(SPR) database and retrieved as authenticated QoS profiles by the ASN Gateway. The A-PCEF negotiates via R6 with
the Service Flow Manager (SFM) function on the base station. If the authorized QoS profile matches the available base
station resources, the request is granted. The A-PCEF provides the following:
Traffic classification
Admission control
Prioritization (DSCP marking)
Per-session/per-flow bandwidth control
Flow mapping across application-specific R6/R4 GRE tunnels
In conjunction with multiflow QoS, the ASN Gateway offers configurable accounting on a per-session, per-R6, or per-
service flow basis. Multi-flow QoS enables the OFDM radio access connection to be separated into multiple logical
Connection ID‘s (CIDs) with each pair of forward and reverse sub-channels transporting one or more application flows.
Currently, the ASN Gateway supports static pre-provisioned service flows. A total of up to three bi-directional or 6
unidirectional service flows per subscriber R6 or R4 session are possible.
Multi-flow QoS provides enhanced an user experience via end-to-end differentiated QoS connection-oriented services
and stringent treatment for isochronous voice and delay-sensitive multimedia applications over broadband WiMAX
networks. This feature also enables service convergence and is the foundation for delivery of IMS service control.
ASN Gateway Intra-Chassis Session Recovery
This feature enables the system to recover from single software or hardware faults without interrupting subscriber
sessions or losing accounting information. Intra-chassis session recovery uses regular task check-pointing of active call
states to insure that the fail-over task has the identical configuration and state as the failed process.
Session recovery is supported for the following major features:
Simple IP, Proxy Mobile IP or Client Mobile IP calls
R6 or R4 control signaling and bearer level subscriber traffic
Paging Controller/Location Register (PC/LR) idle mode sessions. PC/LR is a licensed-based feature.
L2TP LAC & LNS tunnels and sessions
Important:
Minimum hardware requirements consist of four processing cards (3 Active, 1 Standby). When
session recovery is enabled, overall system capacity may be reduced, depending upon configuration.
Intra-chassis session recovery provides hitless in-service recovery that increases system availability. This eliminates the
need for the Radio Access Network to re-register large blocks of simultaneous users. It also minimizes the likelihood of
revenue leakage due to the failure of network elements.
This feature requires a feature license key for ASN Gateway session recovery.