23-35
Catalyst 6500 Series Switch Software Configuration Guide—Release 8.7
OL-8978-04
Chapter 23 Configuring Redundancy
MSFC Redundancy
To determine the status of the designated MSFC, enter the show fm features or the show redundancy
command:
Router-15# show redundancy
Designated Router: 1 Non-designated Router:2
Redundancy Status: non-designated
Config Sync AdminStatus : enabled
Config Sync RuntimeStatus: enabled
Router-16# show redundancy
Designated Router: 1 Non-designated Router:2
Redundancy Status: designated
Config Sync AdminStatus : enabled
Config sync RuntimeStatus: enabled
High-availability redundancy provides the startup and running configuration synchronization.
When you enable high-availability redundancy, the startup configuration of both MSFCs is updated
when you enter either of these commands on the designated MSFC:
• write mem
• copy source startup-config
When you enable high-availability redundancy, every configuration command that is executed on the
designated MSFC is sent to the nondesignated MSFC. In addition, the running configuration
synchronization is updated when you enter the copy source running-config command on the designated
MSFC.
These sections provide information about the MSFC configuration synchronization:
• Configuration Synchronization States, page 23-35
• alt Keyword Usage, page 23-36
Configuration Synchronization States
The two states for the configuration synchronization are as follows:
• Config Sync AdminStatus—Signifies what the user has configured for this feature at that moment
• Config Sync RuntimeStatus—Enabled only when the following occurs:
–
The Config Sync AdminStatus is enabled on both the designated and nondesignated MSFCs
–
The designated and nondesignated MSFCs are running compatible images
When you enable the Config Sync RuntimeStatus, the following occurs:
• No configuration mode is available on the CLI of the nondesignated MSFC; EXEC mode is available
• The alt keyword is available and required (see the “alt Keyword Usage” section on page 23-36 for
more information on the alt keyword)
• The running and startup configurations are synchronized
When the Config Sync RuntimeStatus is in disabled mode, the following occurs:
• Configuration mode is available on the CLI of both MSFCs
• The alt keyword is available but optional
• The running and startup configurations are not synchronized
The various configuration and operation cases are covered in the “High-Availability Redundancy
Configuration Examples” section on page 23-37.
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