Features And Functionality - Licensed Enhanced Feature Software - Cisco ASR 5000 series Product Overview

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Mobility Management Entity Overview

Features and Functionality - Licensed Enhanced Feature

This section describes the optional enhanced features and functions for MME service.

functionality with the MME service.

This section describes following enhanced features:

Session Recovery Support

IPv6 Support

IP Security (IPSec)

Lawful Intercept

MME Inter-Chassis Session Recovery

Web Element Management System

Session Recovery Support

The Session Recovery feature provides seamless failover and reconstruction of subscriber session information in the

event of a hardware or software fault within the system preventing a fully connected user session from being

disconnected.

This feature is also useful for Software Patch Upgrade activities. If session recovery feature is enabled during the

software patch upgrading, it helps to permit preservation of existing sessions on the active PSC during the upgrade

Session recovery is performed by mirroring key software processes (e.g. session manager and AAA manager) within the

system. These mirrored processes remain in an idle state (in standby-mode), wherein they perform no processing, until

they may be needed in the case of a software failure (e.g. a session manager task aborts). The system spawns new

instances of ―standby mode‖ session and AAA managers for each active control processor (CP) being used.

Additionally, other key system-level software tasks, such as VPN manager, are performed on a physically separate

packet processing card to ensure that a double software fault (e.g. session manager and VPN manager fails at same time

on same card) cannot occur. The packet processing card 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 packet processing card.

There are two modes for Session Recovery.

Some of the following features require the purchase of an additional license to implement the

Features and Functionality - Licensed Enhanced Feature Software ▀

Cisco ASR 5000 Series Product Overview ▄