Non-Optimized Inter-Hsgw Session Handover; Quality Of Service Management Features - Cisco ASR 5000 Series Administration Manual

Hrpd serving gateway
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▀ Features and Functionality - Base Software
Additionally, other key system-level software tasks, such as VPN manager, are performed on a physically separate
Packet Service Card (PSC) to ensure that a double software fault (e.g. session manager and VPN manager fails at same
time on same card) cannot occur. The PSC used to host the VPN manager process is in active mode and is reserved by
the operating system for this sole use when session recovery is enabled.
The additional hardware resources required for session recovery include a standby system processor card (SPC) and a
standby PSC.
There are two modes for Session Recovery.
Task recovery mode: Wherein one or more session manager failures occur and are recovered without the need
to use resources on a standby PSC. In this mode, recovery is performed by using the mirrored "standby-mode"
session manager task(s) running on active PSCs. The "standby-mode" task is renamed, made active, and is then
populated using information from other tasks such as AAA manager.
Full PSC recovery mode: Used when a PSC hardware failure occurs, or when a PSC migration failure happens.
In this mode, the standby PSC is made active and the "standby-mode" session manager and AAA manager
tasks on the newly activated PSC perform session recovery.
Session/Call state information is saved in the peer AAA manager task because each AAA manager and session manager
task is paired together. These pairs are started on physically different PSCs to ensure task recovery.
Important:
System Enhanced Feature Configuration Guide.

Non-Optimized Inter-HSGW Session Handover

Enables non-optimized roaming between two eHRPD access networks that lack a relationship of trust and when there
are no SLAs in place for low latency hand-offs.
Inter-HSGW hand-overs without context transfers are designed for cases in which the user roams between two eHRPD
networks where no established trust relationship exists between the serving and target operator networks. Additionally
no H1/H2 optimized hand-over interface exists between the two networks and the Target HSGW requires the UE to
perform new PPP LCP and attach procedures. Prior to the hand-off the UE has a complete data path with the remote
host and can send and receive packets via the eHRPD access network and HSGW & PGW in the EPC core.
The UE eventually transitions between the Serving and Target access networks in active or dormant mode as identified
via A16 or A13 signaling. The Target HSGW receives an A11 Registration Request with VSNCP set to "Hand-Off".
The request includes the IP address of the Serving HSGW, the MSID of the UE and information concerning existing
A10 connections. Since the Target HSGW lacks an authentication context for the UE, it sends the LCP config-request to
trigger LCP negotiation and new EAP-AKA procedures via the STa reference interface. After EAP success, the UE
sends its VSNCP Configure Request with Attach Type equal to "Hand-off". It also sets the IP address to the previously
assigned address in the PDN Address Option. The HSGW initiates PMIPv6 binding update signaling via the S2a
interface to the PGW and the PGW responds by sending a PMIPv6 Binding Revocation Indication to the Serving
HSGW.

Quality of Service Management Features

This section describes the following features:
▄ Cisco ASR 5000 Series HRPD Serving Gateway Administration Guide
For more information on session recovery support, refer to the Session Recovery chapter in the
HRPD Serving Gateway Overview
OL-22984-01

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