Cisco 4948 Series - Technical Specifications; Performance and Switching Specs; Layer 2 Features

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Table 1. Descriptions of Software Configuration Options for Cisco Catalyst 4948
Software Image Description
IP Base Image
Standard Layer 3 image, including Routing Information Protocol Version 1 (RIPv1), RIPv2, static routes,
EIGRP stub.
Enterprise Services Image
Enhanced Layer 3 image, including Open Shortest Path First (OSPF), Intermediate System-to-Intermediate System
(IS-IS), and Enhanced Interior Gateway Routing Protocol (EIGRP), Border Gateway Protocol (BGP), Appletalk, and
Internetwork Packet Exchange (IPX). Also includes all IP Base Image features.
TECHNICAL SPECIFICATIONS
Performance and Switching Specifications
• 96 Gbps nonblocking switch fabric
• 72 Mpps Layer 2 Forwarding (hardware)
• 72 Mpps Layer 3 and 4 forwarding—IP routing, Cisco Express Forwarding-based (hardware)
• Layer 2–4 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
• ACL or quality-of-service (QoS) entries: 32,000
• Uplinks: 4 alternatively wired SFP ports with (Gigabit EtherChannel) support
• Latency: 6 microseconds for 64-byte packets
• Switched virtual interfaces (SVIs): 2048
• STP instances: 1500
• Internet Group Management Protocol (IGMP) snooping entries: 8000
Layer 2 Features
• Layer 2 hardware forwarding at 72 Mpps
• Layer 2 switch ports and VLAN trunks
• IEEE 802. 1Q VLAN encapsulation
• Inter-Switch Link (ISL) VLAN encapsulation
• Dynamic Trunking Protocol (DTP)
• VLAN Trunking Protocol (VTP) and VTP domains
• Per-VLAN Spanning Tree Protocol (PVST+) and Per-VLAN Rapid Spanning Tree Protocol (PVRST)
• Spanning-tree PortFast and PortFast guard
• Spanning-tree UplinkFast and BackboneFast
• 802.1s
• 802.1w
• Spanning-tree root guard
• Cisco Discovery Protocol
• IGMP snooping v1, v2, and v3
• 802.3ad
• Cisco EtherChannel
®
technology, Cisco Fast EtherChannel technology, and Cisco Gigabit EtherChannel technology support