Cisco Cisco Packet Data Gateway (PDG) 故障排查指南
Interchassis Session Recovery
▀ ICSR Operation
▄ Cisco ASR 5000 Series Enhanced Feature Configuration Guide
OL-22982-01
Figure 17. ICSR Flow Diagram
Chassis #1
(Primary)
Chassis #2
(Backup)
This is the current active chassis
State = Active
State = Active
This is the current inactive chassis.
State = Inactive
State = Inactive
Backup chassis detects that the primary has not
sent a hello within the dead-interval and initiates
switchover from the inactive to the active state.
State = Active
sent a hello within the dead-interval and initiates
switchover from the inactive to the active state.
State = Active
Hello Message
State = Inactive
Primary chassis receives hello
message with backup chassis status of
active and transitions to the inactive state.
State = Inactive
message with backup chassis status of
active and transitions to the inactive state.
State = Inactive
Backup chassis begins advertising the
srp-activated loopback and pool routes into the
routing domain, and AAA services are enabled.
Chassis begins taking calls.
State = Active
srp-activated loopback and pool routes into the
routing domain, and AAA services are enabled.
Chassis begins taking calls.
State = Active
Hello messages passed between chassis
Hello Message
State = Inactive
Hello Message
State = Active
Hello Message
State = Inactive
Dead Interval
(Default = 60 secs)
Hello Message
State = Inactive
This chassis fails and stops sending
hello messages
State = Active
hello messages
State = Active
Primary chassis recovers and begins
sending hello messages
State = Inactive
sending hello messages
State = Inactive
Session checkpoint message after call duration of 60 seconds