- Overview of the Intelligent Wireless Access Gateway
- IP Sessions Over Gigabit EtherChannel
- Multiple-Flow Tunnel
- Service Provider WiFi: Support for Integrated Ethernet Over GRE
- GTPv2 Support in the iWAG
- iWAG SSO Support for GTP
- Configuring ISG Policy Templates
- Cisco ISG Accounting Accuracy for LNS Sessions
- Call Admission Control
- iWAG Dual-Stack IPoE Session
- Flow-Based Redirect
- Web Authentication Support for iWAG-GTP
- QoS on Ethernet over GRE Tunnels
- PMIP MAG SSO
- iWAG-GTP: S2a Interface Support and High Availability Enhancements
- DHCP Option 82 Remote ID Format
- VLAN ID Based Policy Control
- EoGRE iWAG Subscriber Roaming
- EoGRE: Inter-chassis HA
- Call Flows for Simple IP Users
- Call Flows for 3G and 4G Mobile IP Users
- iWAG Scalability and Performance
Intelligent Wireless Access Gateway Configuration Guide
Bias-Free Language
The documentation set for this product strives to use bias-free language. For the purposes of this documentation set, bias-free is defined as language that does not imply discrimination based on age, disability, gender, racial identity, ethnic identity, sexual orientation, socioeconomic status, and intersectionality. Exceptions may be present in the documentation due to language that is hardcoded in the user interfaces of the product software, language used based on RFP documentation, or language that is used by a referenced third-party product. Learn more about how Cisco is using Inclusive Language.
- Updated:
- August 22, 2017
Chapter: EoGRE: Inter-chassis HA
EoGRE: Inter-chassis
HA
The EoGRE: Inter-chassis HA feature converts the existing IP session to Dynamic Host Configuration Protocol (DHCP) session upon receiving DHCP control packets requested by the subscriber.
- Finding Feature Information
- Information About EoGRE: Inter-Chassis HA
- Additional References for EoGRE: Inter-Chassis HA
- Feature Information for EoGRE: Inter-chassis HA
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.
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 EoGRE: Inter-Chassis HA
Overview of EoGRE: Inter-Chassis HA
The support for interchassis stateless High Availability (HA) results in an existing DHCP session to appear as unclassified IP session. The subscriber is unaware about the reboot of iWAG on the device and continues to send data packets thereby creating an unclassified IP session. After half lease time, the subscriber may send a unicast renew which removes the existing session and creates a new DHCP session. Therefore it is mandatory to keep the existing session and continue the service to the subscriber unless the subscriber reappears on different service set identifier (SSID) or reboot and send discover packet.
On receiving the DHCP control packets, iWAG validates the packets against any existing unclassified session. If an unclassified session is found, iWAG validates the subnet of both the existing session and the DHCP control packet. If the subnets match, iWAG will update the existing session from unclassified MAC to DHCP session creating a DHCP binding.
 Note | In case of any discrepancy, iWAG will bring down the existing unclassified session, discarding the DHCP control packet as well. |
EoGRE: Inter-Chassis Stateless HA Call Flow
The following figure and the subsequent steps describes a call flow pertaining to a Ethernet over GRE (EoGRE): intra-chassis stateless HA.
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IP session is established on iWAG when a subscriber device connects to network through open or secure SSID.
1a. Session establishment through Open SSID
1b. Session establishment through Secure SSID
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In case of a fail over, session is re-established on the standby iWAG.
2a. Coverts subscriber from existing IP session to DHCP session.
Additional References for EoGRE: Inter-Chassis HA
Related Documents
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Related Topic |
Document Title |
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Cisco IOS commands |
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iWAG commands |
Cisco IOS Intelligent Wireless Access Gateway Command Reference |
Technical Assistance
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Description |
Link |
|---|---|
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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. |
Feature Information for EoGRE: Inter-chassis HA
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.|
Feature Name |
Releases |
Feature Information |
|---|---|---|
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EoGRE: Inter-chassis HA |
Cisco IOS XE Release 3.16S |
The EoGRE: Inter-chassis HA feature converts the existing IP session to Dynamic Host Configuration Protocol (DHCP) session upon receiving DHCP control packets requested by the subscriber. |
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