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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
