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Catalyst 6500 Series Switch Software Configuration Guide—Release 8.7
OL-8978-04
Chapter 23 Configuring Redundancy
MSFC Redundancy
• When using the authentication methods to control access to the switch, such as RADIUS or
TACACS+, you must configure a fallback option to log in with a local username and password if
you want to access the nondesignated router through the switch console or session commands.
See Chapter 39, “Configuring the Switch Access Using AAA” for information on configuring the
fallback option.
Configuring Single Router Mode Redundancy on Supervisor Engine 720
Note Single router mode redundancy is the only supported MSFC redundancy option for Supervisor
Engine 720 and Supervisor Engine 32.
With Supervisor Engine 720 and Supervisor Engine 32, you do not have to explicitly enable SRM on the
MSFC; SRM is enabled by default. To ensure that SRM works properly, you must verify that both
MSFCs have the identical startup configuration with one of these two methods:
1. After the system is reset and has reloaded, enter the write erase command on the nondesignated
MSFC and reload the nondesignated MSFC.
2. After the system is reset and has reloaded, enter the show redundancy command to verify that the
SRM run-time status is enabled. After verifying that the SRM run-time status is enabled, enter the
write memory command on the designated MSFC and reload the nondesignated MSFC (do not save
the configuration on the nondesignated MSFC at the reload prompt).
Tip We recommend that you use the second method where the nondesignated MSFC starts with the same
configuration as the designated MSFC. This method lessens the chance of encountering any unforeseen
problems.
Note If the nondesignated MSFC startup configuration had configuration items that were not present in the
designated MSFC configuration during the system boot, the MSFCs will be inconsistent with their
run-time configuration state. Both procedures ensure that the nondesignated MSFC always has the same
run-time configuration as the designated MSFC.
Configuring Single Router Mode Redundancy on Supervisor Engine 1 or Supervisor Engine 2
To configure SRM redundancy, perform these steps:
Caution Before going from dual router mode to SRM redundancy, we recommend that you use the copy
running-config command on the MSFCs to save the non-SRM configuration to bootflash. When going
to SRM redundancy, the alternative configuration (the configuration following the alt keyword) is lost.
Before enabling SRM redundancy, save the dual router mode configuration to bootflash by entering the
copy running-config bootflash:nosrm_dual_router_config command on both MSFCs.
See the “Getting Out of Single Router Mode” section on page 23-49 for additional information.
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