For release 20.0 and higher, ICSR will verify session manager connectivity on both chassis prior to allowing
a manual switchover. If one or more of the session managers in the active chassis is not connected on the
standby chassis, the switchover will not be initiated. An error message will appear on the screen noting
the number of session managers that are mismatched. The
force
keyword can be used to initiate the
switchover despite the mismatch(es). The output of the
show checkpoint statistics verbose
command
will not indicate "Ready" for a session manager instance ("smgr inst") in the "peer conn" column for any
instance that is not connected to the peer chassis.
Important
show Commands
Exec mode
show srp
commands display a variety of information related to SRP functions. The table below
lists and briefly describes these commands. For complete information on these commands, see the
Exec Mode
show Commands (Q-S)
chapter of the
Command Line Interface Reference
.
Table 20: show srp Commands
Description
Command
Displays statistics of an external audit.
show srp audit-statistics
Displays the history of calls lost during switchover.
show srp call-loss statistics
Displays check pointing statistics on session redundancy data (session
managers, current call recovery records, etc.).
show srp checkpoint statistics
Displays Service Redundancy Protocol information (context, chassis
state, peer, connection state, etc.).
show srp info
Displays SRP monitor information.
show srp monitor
Displays SRP statistics (hello messages sent, configuration validation,
resource messages, switchovers, etc.).
show srp statistics
For additional information about the output of
show srp
commands, see the
Statistics and Counters Reference
.
AAA Monitor
AAA servers are monitored using the authentication probe mechanism. AAA servers are considered Up if the
authentication-probe receives a valid response. AAA servers are considered Down when the
max-retries
count
specified in the configuration of the AAA server has been reached. SRP initiates a switchover when
none of the configured AAA servers responds to an authentication probe. AAA probing is only performed on
the active chassis.
A switchover event caused by an AAA monitoring failure is non-revertible.
Important
If the newly active chassis fails to monitor the configured AAA servers, it remains as the active chassis until
one of the following occurs:
ASR 5500 System Administration Guide, StarOS Release 21.5
269
Interchassis Session Recovery
AAA Monitor