Cisco Intelligent Wireless Access Gateway User Manual

CHAPTER 6
iWAG SSO Support for GTP
Effective from Cisco IOS XE Release 3.10S, the per-session Stateful Switchover (SSO)/In Service Software
Upgrade (ISSU) feature supports iWAG mobility sessions that are tunneled to MNO using GTP. The SSO
feature takes advantage of Route Processor (RP) redundancy by establishing one of the RPs as the active
processor, while the other RP is designated as the standby processor, and then synchronizing the critical
state information between them. When a failover occurs, the standby device seamlessly takes over, starts
performing traffic-forwarding services, and maintains a dynamic routing table.
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Finding Feature Information, page 57
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Information About iWAG SSO Support for GTP, page 57
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Enabling SSO Support for the GTP, page 58
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Additional References, page 59
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Feature Information for iWAG SSO Support for GTP, page 60
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.
Information About iWAG SSO Support for GTP
The SSO/ISSU feature supports only the Cisco ASR 1000 Series Aggregation Services Routers intrachassis
(RP-to-RP) SSO, but not the interchassis (Cisco ASR1K-to-Cisco ASR1K) SSO. The First Sign Of Life
(FSOL) triggers that are supported on SSO include DHCP proxy (where the iWAG acts as the DHCP proxy
server) and DHCP proxy plus unclassified MAC.
For more information about ISSU, see the “Overview of ISSU on the Cisco ASR 1000 Series Routers” section
of the Cisco ASR 1000 Series Aggregation Services Routers Software Configuration Guide.
Intelligent Wireless Access Gateway Configuration Guide
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Cisco Intelligent Wireless Access Gateway Specifications

General

Brand	Cisco
Model	Intelligent Wireless Access Gateway
Category	Gateway
Language	English