Asr 5500 System Administration Guide, Staros Release 21.4 - Cisco ASR 5000 Series Administration Manual

Overview
The chassis determine which is active through a proprietary TCP-based connection known as the Service
Redundancy Protocol (SRP) link. The SRP link is used to exchange Hello messages between the primary and
backup chassis and must be maintained for proper system operation.
ICSR licenses are currently supported for the following services:
• eHRPD – Evolved High Rate Packet Data
• ePDG – Evolved Packet Data Gateway
• GGSN – Gateway GPRS Support Node
• HA – Home Agent
• P-GW – Packet Data Network Gateway
• PDSN – Packet Data Serving Node
• S-GW – Serving Gateway
• SAEGW – System Architecture Evolution Gateway
• SaMOG – S2a Mobility over GTP
L2TP Access Concentrator (LAC) functionality for ICSR is supported by the following protocol and services:
• eGTP – enhanced GPRS Tunneling Protocol
• GGSN – Gateway GPRS Support Node
• P-GW – Packet Data Network Gateway
• SAEGW – System Architecture Evolution Gateway
L2TP Access Concentrator (LAC) functionality for ICSR is not supported by the following services:
• HA – Home Agent
• PMIP – Proxy Mobile IP
L2TP Network Server (LNS) functionality for ICSR is not supported by any services.
For releases prior to 17.0, ICSR should not be configured on chassis supporting L2TP calls.
Important
ICSR support for LAC requires a separate LAC license, as well as an Inter-Chassis Session Recovery
Important
license.
Contact your Cisco account representative to verify whether a specific service supports ICSR as an option.
Important

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Interchassis Session Recovery