Cisco 73-9778-05 A1 is the internal manufacturing part number printed directly on the circuit board for the Cisco WS-X4590-E Catalyst Switch Fabric Redundancy Module.Function and PurposeThis specialized sub-module is designed specifically for redundant supervisor configurations within the Cisco Catalyst 4507R-E and 4510R-E modular chassis systems.

• Active Switch Fabric Redundancy: In a dual-supervisor setup, this module bridges the switching fabric data paths between the primary active and secondary standby supervisor engines.
• Non-Disruptive Failover: If the primary supervisor engine fails, this module enables a seamless, sub-second hardware failover to the standby supervisor without dropping active network traffic.
• Architecture Support: It supports the high-bandwidth, non-blocking backplane capabilities native to the Cisco E-Series Catalyst chassis.

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