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

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8-5. MSFC Redundancy with Configuration Synchronization

  • In config-sync mode, both MSFCs are active at all times; all interfaces and routing processes are available and active on both modules.

  • One MSFC is “designated” and maintains the master copies of startup and running configurations. The other is “nondesignated” and receives its configurations from the designated module.

  • The nondesignated MSFC can be monitored through an EXEC session, but doesn't allow the configuration mode.

  • Config-sync mode allows an immediate failover because both MSFCs are always active. All VLAN interfaces are up, and any configured routing protocols are active on both modules.

  • For MLS, either of two redundant MSFC modules can be involved in setting up a flow cache entry. ...

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