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SKU: WS-C4900M

Cisco Catalyst 10Gb Layer 3 Switch | WS-C4900M

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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-45 Half Card 20-Port Wire-Speed 10/100/1000 RJ-45
WS-X4920-GB-RJ45
  • Ports: 20 RJ-45
  • Protocol: Ethernet
  • Speed: 10/100/1000 Mbps (auto-sensing)
4-Port Wire-Speed 10-Gigabit Ethernet X2 Half Card 4-Port Wire-Speed 10GbE X2
WS-X4904-10GE
  • Ports: 4 X2 slots
  • Protocol: 10 Gigabit Ethernet
  • Speed: 10 Gbps per port (wire-speed)
8-Port (2</b>: 1) 10-Gigabit Ethernet X2 Half Card 8-Port (2: 1) 10GbE X2
WS-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</b>: 1) 10GBASE-T RJ-45 Half Card 8-Port (2: 1) 10GBASE-T RJ-45
WS-X4908-10G-RJ45
  • Ports: 8 RJ-45
  • Protocol: 10 Gigabit Ethernet over copper
  • Speed: 10 Gbps (oversubscribed 2: 1)
  • Backwards compatible with 1000BASE-T

Spec Sheet 4

Feature and Description Cisco Catalyst 4948 Cisco Catalyst 4948—10GE Cisco Catalyst 4900M
Switching capacity 96 Gbps 136 Gbps 320 Gbps
Throughput 72 mpps 102 mpps 250 mpps for IPv4
125 mpps for IPv6
IPv6 support In software In software In hardware
Height 1RU 1RU 2RU
Modular half-card slots 0 0 2
Maximum 10/100/1000 Ports 48 48 40
Maximum 10 Gigabit Ethernet (RJ-45) ports 0 0 16
Maximum 10 Gigabit Ethernet (fiber) ports 0 2 24
Maximum Gigabit Ethernet (fiber) ports 4 0 32 (Cisco TwinGig Converter Module)
Cisco TwinGig Converter Module support No No Yes (half cards only)
Uplink optic types 4 SFP optics Two X2 (10 Gigabit Ethernet) optics Eight X2 (10 Gigabit Ethernet) optics, 8 SFP+ (using OneX)
Multilayer switching IP Base and Enterprise Services options IP Base and Enterprise Services options IP Base and Enterprise Services options
Shared buffer 16 MB 16 MB 17.5 MB
CPU 266 MHz 666 MHz 1.3 GHz
Synchronous Dynamic RAM (SDRAM) 256 MB 256 MB 512 MB
Active VLANs 4096 4096 4096
Multicast entries 28,000 (Layer 3)
16,000 (Layer 2)		 28,000 (Layer 3)
16,000 (Layer 2)		 70,000 for IPv4
35,000 for IPv6
Per VLAN Spanning Tree (PVST) Protocol and VLAN IDs 4096 4096 4096
Spanning Tree Protocol instances 4094 4094 4094
Switched Virtual Interfaces (SVIs) 2000 2000 4096
Security and quality-of-service (QoS) hardware entries 32,000 32,000 128,000
MAC addresses 32,000 55,000 55,000
Switched Port Analyzer (SPAN) 2 ingress and 4 egress 2 ingress and 4 egress 8 ingress and 8 egress
USB port No No Yes
Compact flash memory support No Yes Yes
System reset button No No Yes
Minimum software requirement Cisco IOS Software Release 12.2(20)EWA or later Cisco IOS Software Release 12.2(25)EWA or later Cisco IOS Software Release 12.2(46)SG or later

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