The Cisco Catalyst 4948 is a wire-speed, low-latency, Layer 2-4, 1-rack-unit (1 RU) fixed-configuration switch for rack-optimized server switching. Based on the proven Cisco Catalyst 4500 Series hardware and software architecture, the Cisco Catalyst 4948 Series offers exceptional performance and reliability for low density, multilayer aggregation of high performance servers and workstations. The Cisco Catalyst 4948 offers 48 ports of wire-speed 10/100/1000BASE-T with 4 alternative wired ports that can accommodate optional 1000BASE-X Small Form-Factor Pluggable (SFP) optics. Exceptional reliability and serviceability are delivered with optional internal AC or DC 1 + 1 hot-swappable power supplies and a hot-swappable fan tray with redundant fans.

Features

• 96 Gbps nonblocking switch fabric
• 72 mpps Layer 2 forwarding (hardware)
• 72 mpps Layer 3 and 4 forwarding: IP routing and Cisco Express Forwarding (hardware)
• Layer 2 to 4 hardware-based switch engine (application-specific integrated circuit [ASIC]-based)
• Unicast and multicast routing entries: 32,000
• Support for 2048 active VLANs and 4096 VLAN IDs per switch
• Layer 2 multicast addresses: 16,384
• MAC addresses: 32,768
• Policers: 512 ingress and 512 egress
• Access control list (ACL) and QoS entries: 32,000
• Uplinks: 4 alternatively wired SFP ports with Cisco Gigabit EtherChannel support
• Latency: 6 microseconds for 64-byte packets
• SVIs: 2048
• Spanning Tree Protocol instances: 1500
  Internet Group Management Protocol (IGMP) snooping entries: 8000