Software Redundancy on the Cisco 8500 Series Catalyst Edge Platform
This section covers the following topics:
Software Redundancy Overview
On the Cisco 8500 Series Catalyst Edge Platform, IOS runs as one of many processes within the operating system. This is different than on traditional Cisco IOS, where all processes are run within Cisco IOS. See the “IOS as a Process” section on page 2-7 for more information regarding IOS as a process on the Cisco 8500 Series Catalyst Edge Platform.
This architecture allows for software redundancy opportunities that are not available on other platforms that run Cisco IOS software. Specifically, a standby IOS process can be available on the same Route Processor as the active IOS process. This standby IOS process can be switched to in the event of an IOS failure.
On the Cisco 8500 Series Catalyst Edge Platform, the second IOS process can run only on the standby Route Processor.
Configuring two Cisco IOS processes
On the Cisco 8500 Series Catalyst Edge Platform, Cisco IOS runs as one of the many processes. This architecture supports software redundancy opportunities. Specifically, a standby Cisco IOS process is available on the same Route Processor as the active Cisco IOS process. In the event of a Cisco IOS failure, the system switches to the standby Cisco IOS process.
SUMMARY STEPS
- enable
- configure terminal
- redundancy
- mode SSO
- exit
- reload
DETAILED STEPS
Command or Action | Purpose | |
---|---|---|
Step 1 |
enable Example:
|
Enables privileged EXEC mode.
|
Step 2 |
configure terminal Example:
|
Enters global configuration mode. |
Step 3 |
redundancy Example:
|
Enters redundancy configuration mode. |
Step 4 |
mode SSO Example:
|
Configures SSO. When this command is entered, the redundant supervisor engine is reloaded and begins to work in SSO mode. |
Step 5 |
exit Example:
Example:
|
Exits configuration mode and returns to global configuration mode. |
Step 6 |
reload Example:
|
Reloads IOS. |
Example
Router# configure terminal
Router(config)# redundancy
Router(config)# mode SSO
Router(config)# exit
Router# reload