IOS Software Modularity

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IOS Software Modularity is an extension to the Cisco IOS operating system that allows for an In-Service Software Upgrade (ISSU) of router or switch functionality. IOS Software Modularity appears in version 12.2(18)SXF4 which is available for the Catalyst 6500 Catalyst switch. IOS Software Modularity is based on the QNX microkernel.

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