Cisco Cisco ASR 5700 Guide De Dépannage
ASR5x00 Session Manager Tasks - Description of
Function, Crash, Recovery Operations, and Crash
Logs
Function, Crash, Recovery Operations, and Crash
Logs
Document ID: 119224
Contributed by Krishna Kishore D V, Cisco TAC Engineer.
Aug 25, 2015
Contents
Introduction
Software Architecture: Designed for Resiliency
What is a crash?
Effects of a Session Manager Crash
When should the operator get concerned?
How to know if a crash occurred?
Crash Logging Architecture
Synchronization of Crash Events and Minicores between Management Cards
Commands
Summary
Software Architecture: Designed for Resiliency
What is a crash?
Effects of a Session Manager Crash
When should the operator get concerned?
How to know if a crash occurred?
Crash Logging Architecture
Synchronization of Crash Events and Minicores between Management Cards
Commands
Summary
Introduction
This document describes and explains the software reliability, service availability, and failover features for the
Cisco Aggregation Services Router (ASR) 5x00 Series. It presents the definition for a software crash on
ASR5x00 and the effects of the software crash. The article goes on to establish that even in case of
unexpected software crashes, how the ASR5x00 is able to deliver the goal of "carrier-class" availability due to
the inherent software resiliency and availability features. The mobile subscriber should never have to think
about the availability of the service. Cisco's goal is no session loss due to any single hardware or software
failures, which include loss of a complete system, in other words - voice grade reliability. The software
reliability features on ASR5x00 are targeted to be able to achieve the goals for "carrier-class" service
availability even in cases where unforeseen failures might occur in an operator's network.
Cisco Aggregation Services Router (ASR) 5x00 Series. It presents the definition for a software crash on
ASR5x00 and the effects of the software crash. The article goes on to establish that even in case of
unexpected software crashes, how the ASR5x00 is able to deliver the goal of "carrier-class" availability due to
the inherent software resiliency and availability features. The mobile subscriber should never have to think
about the availability of the service. Cisco's goal is no session loss due to any single hardware or software
failures, which include loss of a complete system, in other words - voice grade reliability. The software
reliability features on ASR5x00 are targeted to be able to achieve the goals for "carrier-class" service
availability even in cases where unforeseen failures might occur in an operator's network.
Software Architecture: Designed for Resiliency
The ASR5x00 has a collection of software tasks distributed across the Packet Services Card (PSC) or Data
Processing Card (DPC) and System Management Card (SMC) or Management and I/O (MIO) cards that are
designed to perform a variety of specific functions.
Processing Card (DPC) and System Management Card (SMC) or Management and I/O (MIO) cards that are
designed to perform a variety of specific functions.
For example, the session manager task is responsible for handling the sessions for a set of subscribers and to
perform inline services such as Peer-to-peer (P2P), Deep Packet Inspection (DPI), and so on, on user traffic.
The Authentication, Authorization, and Accounting (AAA) manager task is responsible for the generation of
billing events in order to record subscriber traffic usage and so on. The session manager and AAA manager
tasks run on the PSC/DPC card.
perform inline services such as Peer-to-peer (P2P), Deep Packet Inspection (DPI), and so on, on user traffic.
The Authentication, Authorization, and Accounting (AAA) manager task is responsible for the generation of
billing events in order to record subscriber traffic usage and so on. The session manager and AAA manager
tasks run on the PSC/DPC card.
The SMC/MIO card is reserved for Operation and Maintenance (O&M) and platform related tasks. The
ASR5x00 system is virtually compartmentalized into different software subsystems such as the session
ASR5x00 system is virtually compartmentalized into different software subsystems such as the session