Cisco Cisco Packet Data Gateway (PDG) Guía De Administador
Interchassis Session Recovery
▀ Overview
▄ Cisco ASR 5500 System Administration Guide
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If communication on the SRP link is lost, and both chassis in the redundant pair are claiming to be Active, the
previously Active chassis is still preferred since it is advertising a smaller AS-path into the BGP routing domain. The
route modifier is incremented as switchover events occur. A threshold determines when the route modifier should be
reset to its initial value to avoid rollover.
previously Active chassis is still preferred since it is advertising a smaller AS-path into the BGP routing domain. The
route modifier is incremented as switchover events occur. A threshold determines when the route modifier should be
reset to its initial value to avoid rollover.
Requirements
ICSR configurations require the following:
Two chassis configured for the same service types. The services must be bound on an SRP-activated loopback
interface.
Both chassis must have identical hardware.
Three contexts:
Redundancy – to configure the primary and backup chassis redundancy.
Source – AAA configuration of the specified nas-ip-address must be the IP address of an interface
bound to an HA, or any core network service configured within the same context.
Destination – to configure monitoring and routing to the PDN.
AAA RADIUS server
Border Gateway Protocol (BGP) – ICSR uses the route modifier to determine the chassis priority.
Important:
ICSR is a licensed Cisco feature. Verify that each chassis has the appropriate license before using
these procedures. To do this, log in to both chassis and execute a show license information command. Look for “Inter-
Chassis Session Recovery”. If the chassis is not licensed, please contact your Cisco account representative.
Chassis Session Recovery”. If the chassis is not licensed, please contact your Cisco account representative.
The following figure shows an ICSR network.