Cisco CSS11503-AC is a high-end Content Services Switch (CSS) from the Cisco 11000 Series, designed for enterprise and service provider data centers requiring advanced Layer 4–7 load balancing and application delivery.

It provides scalable traffic distribution, server load balancing, and application-aware switching, ensuring high availability and performance for critical web and enterprise applications.

The 11503 is a chassis-based system, offering modular expansion and higher performance compared to smaller CSS models like the 11051.

? KEY FEATURES

• High-performance Layer 4–7 load balancing (ADC functionality)
• Modular chassis-based design (multi-slot architecture)
• Supports multiple interface modules (Fast Ethernet / Gigabit Ethernet)
• High scalability for enterprise and ISP environments
• Redundant power supply support (AC model)
• Advanced application-aware traffic management
• High availability and failover support

⚙️ TECHNICAL SPECIFICATIONS

? Hardware Platform

• Series: Cisco CSS 11000 Series
• Model: CSS 11503
• Part Number: CSS11503-AC
• Product type: Content switch / application delivery controller
• Form factor: Chassis-based system (multi-slot)

? Interfaces

• Modular interface slots supporting:
  • Fast Ethernet modules
  • Gigabit Ethernet modules
• Dedicated management and console interfaces
• Scalable port density depending on installed modules

⚡ Performance

• High-throughput Layer 4–7 switching
• Designed for large-scale application delivery
• Handles large volumes of concurrent connections
• Optimized for HTTP, HTTPS, and enterprise applications

? Features

• Server Load Balancing (SLB)
• Application-aware traffic routing
• URL and content-based switching
• Health monitoring of backend servers
• Session persistence (sticky sessions)
• SSL termination/offload (module dependent)
• Redundant system and failover support

? Architecture

• Multi-slot chassis with controller and interface modules
• Redundant power supply support (AC version)
• Scalable design for high-density deployments

? Memory

• System memory for session handling and switching
• Flash storage for Cisco CSS OS