The Cisco® Data Center Service Node (DSN) is a new product offering from Cisco that complements the Cisco Nexus® 7000 Series Switches in the data center. Cisco DSN is the platform of choice to host specific integrated network services relevant in a given data center. Examples of network services include the Cisco Firewall Services Module (FWSM) and the Cisco ACE Application Control Engine Module, for server load balancing. The service node-based solution offers proven enterprise products enabling customers to use a common architecture and easily integrate the solution with existing network infrastructure. Deploying a consistent architecture using a common platform can reduce connectivity costs significantly and increase network performance, manageability, and flexibility. Cisco DSN uses a dual-homed approach for data path connectivity to redundant aggregation-layer switches. This approach decouples the service modules from dependence on a specific aggregation switch. Because the Cisco DSN is self-contained, it provides operational flexibility for the system maintenance that may be required for the aggregation-layer switches or the Cisco DSN. From a high-availability perspective, if one of the aggregation switches or Cisco DSNs fails, traffic can continue to flow through the other aggregation switch to the active Cisco DSN without the need of any failover event in the service modules themselves.
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