Cisco Systems 4948 manual Features AT a Glance, Layer 2 Features, Layer 3 Features

Sharing, shaping, and strict-priority configurations determine scheduling of egress traffic. The Catalyst 4948-10GE also supports Dynamic Buffer

Limiting (DBL), a congestion-avoidance feature. For details about the QoS features (including DBL) on the Catalyst 4948-10GE, refer to the QoS

on Cisco Catalyst 4500 Series supervisor engines overview at:

http://www.cisco.com/en/US/partner/products/hw/switches/ps4324/prod_white_papers_list.html

FEATURES AT A GLANCE

Layer 2 Features

∙Layer 2 hardware forwarding at 102 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

∙Support for 2048 VLANs per switch

∙Per-VLAN Spanning Tree (PVST) and PVST Plus (PVST+)

∙Spanning-tree PortFast and PortFast guard

∙Spanning-tree UplinkFast and BackboneFast

∙802.1s

∙802.1w

∙802.3ad

∙Spanning-tree root guard

∙Cisco Discovery Protocol versions 1 and 2

∙IGMP snooping versions 1, 2, and 3

∙Cisco EtherChannel® technology, Cisco Fast EtherChannel technology, and Cisco Gigabit EtherChannel technology

∙Port Aggregation Protocol (PAgP)

∙Link Aggregation Control Protocol (LACP)

∙Unidirectional link detection (UDLD) and aggressive UDLD

∙802.1q-in-802.1q (QinQ) in hardware

∙Layer 2 protocol tunneling

∙Multilayer Jumbo Frames (up to 9216 bytes)

∙Baby Giants (up to 1600 bytes)

∙Unidirectional Ethernet

∙Storm control (formally known as broadcast and multicast suppression)

∙Forced 10/100 autonegotiation

Layer 3 Features

∙Hardware-based IP Cisco Express Forwarding routing at 102 mpps

∙IP routing protocols: EIGRP, OSPF, RIP, and RIP2

∙BGP4 and Multicast Border Gateway Protocol (MBGP)

∙Nonstop Forwarding awareness

∙Hot Standby Router Protocol (HSRP)

∙Software routing of Internetwork Packet Exchange (IPX) and AppleTalk

∙IS-IS routing protocol

© 2005 Cisco Systems, Inc. All rights reserved.

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