Cisco Cisco Packet Data Gateway (PDG)

 

This configuration assigns a chassis mode and priority, and also configures the redundancy link between the primary 
and backup chassis: 

configure 

  context srp_ctxt_name 

    service-redundancy-protocol 

      chassis-mode { primary | backup } 

      priority priority 

      peer-ip-address ip_address 

      hello-interval dur_sec 

      dead-interval dead_dur_sec 

      end 

Notes: 



 

ICSR should be configured and maintained in a separate context. 



 

When assigning the chassis mode on the backup chassis be sure to enter the backup keyword. 



 

The checkpoint command sets the amount of time the chassis waits before check pointing an existing call 

session. Checkpoints can be set for IMS (VoLTE) and/or non-IMS sessions. The checkpoint is a snapshot of 
the current application state that can be used to restart its execution in case of failure. The default setting is 60 
seconds. 



 

The priority determines which chassis becomes active in the event that both chassis are misconfigured with the 

same chassis mode; see 

Chassis Initialization.

  The higher priority chassis has the lower number. Be sure to 

assign different priorities to each chassis. 



 

Enter the IP chassis of the backup chassis as the peer-ip-address to the primary chassis. Assign the IP address of 

the primary chassis as the peer-ip-address to the backup chassis. 



 

The dead-interval must be at least three times greater than the hello-interval. For example, if the hello interval 

is 10, the dead interval should be at least 30. System performance is severely impacted if the hello interval and 
dead interval are not set properly. An optional delay-interval command allows you to delay the start dead-
interval for an interval following the loading of configuration files. 

Guard timers ensure that local failures, such as VM reboots and task restarts, do not result in ICSR events which can be 
disruptive. 

The guard timer command configures the redundancy-guard-period and monitor-damping-period for SRP service 
monitoring. 

configure 

  context context_name 

    service-redundancy-protocol variable