8-4. MSFC Redundancy with Single Router Mode
Only the Catalyst 6000 supports redundant supervisor engines with redundant route processors (MSFC/MSFC2).
Only one MSFC is designated and active; the other is booted up, synchronizes its configuration with the active MSFC, starts any routing protocol processes, but keeps all interfaces in the “line down” state so that no network traffic is exchanged.
Only the designated and active MSFC is involved in creating MLS flow cache entries for the switching engine and in creating and downloading the CEF FIB and adjacency tables to the PFC2 switching engine.
In the event of a failure, single router mode (SRM) causes the nondesignated MSFC to bring its interfaces up and allow its routing protocols to converge. ...
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