Cisco Catalyst 4948 Datasheet page 4

Predictable Performance and Scalability
The Cisco Catalyst 4948 10 Gigabit Ethernet Switch is optimized for multimedia applications with its advanced
multicast support. It supports Protocol Independent Multicast (PIM), Source-Specific Multicast (SSM), and Pragmatic
General Multicast (PGM), providing end users with additional scalability to support multimedia applications. Also
supported is Internet Engineering Task Force (IGMP) snooping in hardware, enhancing performance and reducing
network traffic by allowing a switch to dynamically add and remove hosts from a multicast group.
Intelligent Network Services with QoS and Sophisticated Traffic Management
The Cisco Catalyst 4948 10 Gigabit Ethernet Switch offers superior per-port QoS features to help ensure that
network traffic is classified, prioritized, and scheduled optimally to efficiently manage bandwidth-hungry multimedia,
and time-sensitive and mission-critical applications. The Catalyst 4948 10 Gigabit Ethernet Switch can classify,
police, and mark incoming packets, allowing the administrator to differentiate between traffic flows and enforce
policies. Sharing, shaping, and strict-priority configurations determine scheduling of egress traffic. The Catalyst 4948
10 Gigabit Ethernet Switch also supports Dynamic Buffer Limiting (DBL), a congestion-avoidance feature. For details
about the QoS features (including DBL) on the Cisco Catalyst 4948 10 Gigabit Ethernet Switch, refer to the Cisco
Catalyst 4500 Series supervisor engine QoS overview at
http://www.cisco.com/en/US/products/hw/switches/ps4324/prod_white_papers_list.html.
Features and Specifications at a Glance
Layer 2 Features
Layer 2 hardware forwarding at 102 mpps
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Layer 2 switch ports and VLAN trunks
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IEEE 802. 1Q VLAN encapsulation
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Inter-Switch Link (ISL) VLAN encapsulation
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Dynamic Trunking Protocol (DTP)
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VLAN Trunking Protocol (VTP) and VTP domains
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Support for 4096 VLANs per switch
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PVST and PVST+
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Flexlink
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Spanning Tree PortFast and PortFast Guard
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Spanning Tree UplinkFast and BackboneFast
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IEEE 802.1s
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IEEE 802.1w
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IEEE 802.3ad
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Spanning Tree Root Guard
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Cisco Discovery Protocol Versions 1 and 2
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IGMPv1, v2, and v3 snooping
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Cisco EtherChannel technology, Cisco Fast EtherChannel technology, and Cisco Gigabit EtherChannel
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technology
Port Aggregation Protocol (PAgP)
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Link Aggregation Control Protocol (LACP)
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Unidirectional link detection (UDLD) and aggressive UDLD
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© 2009 Cisco Systems, Inc. All rights reserved. This document is Cisco Public Information.
Data Sheet
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