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Cisco® Field Manual: Catalyst® Switch Configuration by Steve McQuerry, Dave Hucaby

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3-6. Redundant Supervisors

  • When identical Supervisor hardware is placed in slots 1 and 2 of Catalyst 5500 and 6000 series switches, one Supervisor is active and the other is in standby mode.

  • In the event of a failure, the redundant Supervisor takes over switch functionality.

  • Configuration files and operating system files are synchronized between switches.

  • Layer 2 tables are synchronized between the supervisors for quick transitions between modules.

  • Parameters such as the Layer 2 synchronization and operating system synchronization can be managed for the modules.

  • Layer 3 MSFC cards operate independently of the COS and must be managed manually or configured for redundancy in the MSFC IOS. See section “8-4: MSFC Redundancy with Single Router Mode” and ...

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