Intelligent Services Gateway Configuration Guide, Cisco IOS XE Release 3S
ISG SSO and ISSU
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ISG SSO and ISSU

ISG SSO and ISSU

The SSO and ISSU feature for Intelligent Services Gateway (ISG) adds high availability (HA) support to ISG features.

Finding Feature Information

Your software release may not support all the features documented in this module. For the latest caveats and feature information, see Bug Search Tool and the release notes for your platform and software release. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the feature information table at the end of this module.

Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/​go/​cfn. An account on Cisco.com is not required.

Prerequisites for ISG SSO and ISSU

SSO and ISSU must be enabled on the ISG router. For configuration information, see the High Availability Configuration Guide, Cisco IOS XE Release 3S.

Information About ISG SSO and ISSU

High Availability for ISG Features

The SSO and ISSU feature provides high availability (HA) support for the following ISG features during a stateful switchover (SSO) or In Service Software Upgrade (ISSU) event:

Feature

Description

Configuration Information

Absolute timeout (session timer)

Timer is restarted on the new standby Route Processor (RP). During bulk synchronization to the standby RP, the remaining timeout duration is sent to the standby RP and used while the feature is being installed.

“Configuring ISG Policies for Session Maintenance” module in this guide

Idle timeout (connection timer)

Timer is restarted on the new standby RP.

“Configuring ISG Policies for Session Maintenance” module in this guide

ISG accounting

Cumulative counters and accounting ID are checkpointed to the standby RP.

“Configuring ISG Accounting” module in this guide

ISG policer (dynamic rate limiting)

HA support was enabled for this feature.

“Configuring MQC Support for IP Sessions” module in this guide

Keepalive

Associated timers are restarted after the control plane switchover.

“Configuring ISG Policies for Session Maintenance” module in this guide

Layer 4 redirect

Layer 4 redirect includes the selected service group in its checkpoint data during the initial session and bulk synchronization. The standby RP uses the service group instead of selecting a new one.

“Redirecting Subscriber Traffic Using ISG Layer 4 Redirect” module in this guide

Port-bundle host key (PBHK)

PBHK includes the allocated bundle ID in its checkpoint data during the initial session and bulk synchronization. Upon session replay, the standby RP reserves the bundle ID instead of allocating a new one.

“Configuring ISG Port-Bundle Host Key” module in this guide

Traffic classes

ISG traffic classes are checkpointed to the standby RP and established during session replay.

“Configuring ISG Subscriber Services” module in this guide

Additional References

Related Documents

Related Topic

Document Title

Cisco IOS commands

Cisco IOS Master Commands List, All Releases

ISG commands

Cisco IOS Intelligent Services Gateway Command Reference

HA commands

Cisco IOS High Availability Command Reference

HA configuration

High Availability Configuration Guide, Cisco IOS XE Release 3S

Configuring ISG accounting

“Configuring ISG Accounting” module in this guide

Configuring ISG timers

“Configuring ISG Policies for Session Maintenance” module in this guide

Configuring Layer 4 redirect

“Redirecting Subscriber Traffic Using ISG Layer 4 Redirect” module in this guide

Configuring port-bundle host key

“Configuring ISG Port-Bundle Host Key” module in this guide

Configuring traffic classes

“Configuring ISG Subscriber Services” module in this guide

Technical Assistance

Description

Link

The Cisco Support and Documentation website provides online resources to download documentation, software, and tools. Use these resources to install and configure the software and to troubleshoot and resolve technical issues with Cisco products and technologies. Access to most tools on the Cisco Support and Documentation website requires a Cisco.com user ID and password.

http:/​/​www.cisco.com/​cisco/​web/​support/​index.html

Feature Information for ISG SSO and ISSU

The following table provides release information about the feature or features described in this module. This table lists only the software release that introduced support for a given feature in a given software release train. Unless noted otherwise, subsequent releases of that software release train also support that feature.

Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/​go/​cfn. An account on Cisco.com is not required.

Table 1 Feature Information for ISG SSO and ISSU

Feature Name

Releases

Feature Information

ISG: Flow Control: SSO/ISSU

Cisco IOS XE Release 3.5S

HA support was added for the following ISG features:
  • Absolute Timeout
  • Idle Timeout
  • ISG Accounting
  • ISG Policer
  • Keepalive
  • Layer 4 Redirect
  • Port-Bundle Host Key
  • Traffic Classes