для Cisco Cisco Packet Data Gateway (PDG)

 

Chassis configured to support ICSR communicate using periodic Hello messages. These messages are sent by each 
chassis to notify the peer of its current state. The Hello message contains information about the chassis such as its 
configuration and priority. A dead interval is used to set a time limit for a Hello message to be received from the chassis' 
peer. If the standby chassis does not receive a Hello message from the active chassis within the dead interval, the 
standby chassis transitions to the active state. In situations where the redundancy link goes out of service, a priority 
scheme is used to determine which chassis processes the session. The following priority scheme is used: 



 

route modifier 



 

chassis priority 



 

SPIO MAC address 

Checkpoint messages are sent from the active chassis to the inactive chassis at specific intervals and contain all the 
information needed to recreate the sessions on the standby chassis, if that chassis were to become active. Once a session 
exceeds the checkpoint duration, checkpoint data is collected on the session. The checkpoint parameter determines the 
amount of time a session must be active before it is included in the checkpoint message. 

  For more information on inter-chassis session recovery support, refer to the Interchassis Session 

Recovery chapter in the System Administration Guide. 

This section identifies limitations, restrictions, and dependencies for the SaMOG ICSR feature: 



 

In this release, ICSR support is available only for the following sessions types: 



 

PMIPv6 access-type and GTPv2 network type sessions with DIAMETER-based authentication. 



 

EoGRE access-type and GTPv2 network type sessions with DIAMETER-based authentication. 



 

ICSR support is not available for recovering CDR information and SaMOG Local Breakout (LBO) sessions 

(flow-based and LBO Basic). 



 

ICSR support is not available for multiple SaMOG services configuration.