Switch Specs PN: WS-C4900M Default Ports: 8 x 10GbE X2 ports (wire-speed) Expansion Slots: 2 Layer Support: Layer 2 and Layer 3 feature set High Availability: Redundant power and cooling, advanced QoS and security Forwarding Rate: 250 million packets per second (mpps) Part Number: Top-of-Rack Data Center Switching Midmarket Collapsed Core and Aggregation Layer Deployments Flexible Migration from Gigabit to 10 Gigabit Ethernet The Cisco Catalyst 4900M Switch is a high-performance, 2RU fixed-configuration switch designed for top-of-rack data center access and midmarket collapsed core or aggregation layer deployments. It supports both 10/100/1000 and 10GBASE-T server access with 1: 1 uplink-to-downlink oversubscription, making it ideal for mixed or full 10 Gigabit Ethernet environments. The base unit offers eight fixed wire-speed X2 ports and two optional half-card slots, delivering 320 Gbps switching capacity and 250 mpps throughput. Key features include low latency, scalable buffers, hot-swappable power supplies (AC or DC), and a field-replaceable fan tray for optimized uptime. Targeted for space-constrained environments like branch offices or midmarket cores, the 4900M provides wire-speed Layer 3 switching, burst-handling buffer capacity, and high availability. Its semifixed architecture, combined with Cisco’s TwinGig Converter Module, allows flexible deployment of Gigabit Ethernet today with a seamless path to 10 Gigabit upgrades in the future. Designed for operational efficiency, it includes robust management tools and simplifies network operations at the aggregation and core layers. Security Port security for MAC address control Access Control Lists (ACLs) for traffic filtering Fibre Channel Security Protocol (FC-SP) VSAN-based access control Zone-based QoS and security enforcement Traffic isolation using VLANs and PVLANs DHCP snooping and dynamic ARP inspection Unicast Reverse Path Forwarding (uRPF) Secure Shell (SSH) Protocol and SNMPv3 Fabric binding for open system security enforcement Performance 320 Gbps switching capacity 250 million packets per second (mpps) forwarding rate Wire-speed performance on all ports Low-latency architecture optimized for data center environments Scalable packet buffering to handle bursty traffic Jumbo frame support for improved throughput Optional half-cards for flexible port expansion and traffic scaling Support for both 10/100/1000 and 10 Gigabit Ethernet 1: 1 uplink-to-downlink oversubscription capability High-availability hardware with redundant power and cooling Supported Half Cards 20-Port Wire-Speed 10/100/1000 RJ-45WS-X4920-GB-RJ45 Ports: 20 RJ-45 Protocol: Ethernet Speed: 10/100/1000 Mbps (auto-sensing) 4-Port Wire-Speed 10GbE X2WS-X4904-10GE Ports: 4 X2 slots Protocol: 10 Gigabit Ethernet Speed: 10 Gbps per port (wire-speed) 8-Port (2: 1) 10GbE X2WS-X4908-10GE Ports: 8 X2 slots Protocol: 10 Gigabit Ethernet Speed: 10 Gbps (oversubscribed 2: 1) Supports TwinGig Converter for Gigabit SFP use 8-Port (2: 1) 10GBASE-T RJ-45WS-X4908-10G-RJ45 Ports: 8 RJ-45 Protocol: 10 Gigabit Ethernet over copper Speed: 10 Gbps (oversubscribed 2: 1) Backwards compatible with 1000BASE-T
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