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• Bridge protocol data unit (BPDU) guard shuts down Spanning-Tree Protocol PortFast-enabled interfaces when BPDUs
are received to avoid accidental topology loops.
• Spanning-tree root guard (STRG) prevents edge devices not in the network administrator’s control from becoming
Spanning-Tree Protocol root nodes.
Control
Advanced Quality of Service
• 802.1p class of service (CoS) and Differentiated Services Code Point field (DSCP) classification via marking and
reclassification on a per packet basis using source/destination IP address, source/destination MAC address, or Layer 4
TCP/UDP port number.
• Cisco control plane and data plane quality of service ACLs on all ports to ensure proper marking on a per packet basis.
• Four egress queues per port supported in hardware to enable differentiated management of up to four types of traffic.
• Weighted Round Robin (WRR) scheduling to ensure differential prioritization of packet flows by intelligently servicing
the egress queues.
• Weighted Random Early Detection (WRED) on all Gigabit Ethernet ports for avoidance of congestion at the egress
queues before a disruption occurs.
• Strict priority queuing to guarantee that the highest priority packets will always get serviced ahead of all other traffic.
• No performance penalty for highly granular quality of service functionality.
Granular Rate-Limiting
• Cisco Committed Information Rate (CIR) functionality allows bandwidth to be guaranteed in increments as low as 8
Kbps.
• Rate-limiting based on source/destination IP address, source/destination MAC address, or Layer 4 TCP/UDP
information-or any combination of these fields-using QoS ACLs (IP ACLs or MAC ACLs), class maps, and policy maps.
• Ability to easily manage data flows asynchronously upstream and downstream from the end station or on the uplink via
ingress and ingress policing.
• 8 aggregate or individual ingress policers and 8 aggregate egress policers on each 10/100 port.
• 128 aggregate or individual ingress policers and 8 aggregate egress policers on each Gigabit Ethernet port.
Superior Manageability
• Built-in Web-based Cisco Cluster Management Suite (CMS) Software provides an easy-to-use Web-based management
interface through a standard web browser.
• Simple Network Management Protocol (SNMP) v1 and v2c, and Telnet interface support delivers comprehensive in-band
management, and a command-line interface (CLI)-based management console provides detailed out-of-band
management.
• Manageable through CiscoWorks™ network management software on a per-port and per-switch basis providing a
common management interface for Cisco routers, switches and hubs.
• Cisco IOS CLI support provides common user interface and command set with all Cisco routers and Cisco desktop
switches.
• Supported by the Cisco Quality Policy Manager (QPM) solution for end-to-end QoS policies (planned future software
support).
• Supported by the CiscoWorks 2000 LAN Management Solution.
• Supported by the Service Assurance (SA) Agent to facilitate service level management throughout the LAN.
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