Chapter 6 Configuring Supervisor Engine Redundancy on the Catalyst 4507R and 4510R Switches
Understanding Supervisor Engine Redundancy
The standby supervisor engine runs in RPR mode. When RPR mode is used, the standby supervisor engine partially boots and keeps synchronized copies of the active configuration, which shortens the time needed to bring up the standby supervisor engine and have it start handling traffic from 1.5 minutes (for a cold boot on the standby) to 30 seconds (to finish the boot and reestablish links).
In addition to the reduced switchover time, supervisor engine redundancy supports the following:
•Online insertion and removal (OIR) of the standby supervisor engine.
•Software upgrade. (See the “Performing a Software Upgrade” section on page
•
•Hardware signals that detect and decide the active or standby status of supervisor engine.
•Automatic switchover to the standby supervisor engine if the active supervisor engine ever fails.
When the switch is powered on, the two supervisor engines determine which will serve as the primary and which will be the standby. Usually, the supervisor engine that boots first, either in slot 1 or 2, becomes the active supervisor engine.
A switchover will occur when one or more of the following events take place:
•The active supervisor engine fails or is removed.
•A user forces a switchover.
•A user reloads the active supervisor engine.
•A core dump occurs.
Note In a switchover, there is a disruption of traffic because some address states are lost and then restored after they are dynamically redetermined.
Table
Table
Chassis
(Product Number)
Supported Supervisor Engines
Catalyst 4507R | Supports redundant Supervisor Engine |
| Engine IV |
|
|
Catalyst 4510R | Supports redundant Supervisor Engine VSupervisor Engine V, |
|
|
Understanding Supervisor Engine Redundancy
These sections describe supervisor engine redundancy:
•Operation, page 6-3
•Supervisor Engine Synchronization, page 6-3
| Software Configuration |