Cisco 3750V2 - Catalyst 24 10/100 Scheda tecnica - Pagina 9

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is greatly simplified through Auto-QoS, a feature that detects Cisco IP Phones and automatically configures the

switch for the appropriate classification and egress queuing. Other QoS features include the following:

Cross-stack QoS allows QoS to be configured across the entire stack.

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Standard IEEE 802.1p class-of-service (CoS) and differentiated services code point (DSCP) field

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classification are provided, using marking and reclassification on a per-packet basis by source and

destination IP address, source and destination MAC address, or Layer 4 TCP or User Datagram Protocol

(UDP) port number.

Cisco control- and data-plane QoS ACLs on all ports help ensure proper marking on a per-packet basis.

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Four egress queues per port enable differentiated management of up to four traffic types.

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Shaped Round Robin (SRR) scheduling helps ensure differential prioritization of packet flows by intelligently

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servicing the ingress and egress queues.

Weighted Tail Drop (WTD) provides congestion avoidance at the ingress and egress queues before a

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disruption occurs.

Strict priority queuing helps ensure that the highest-priority packets are serviced ahead of all other traffic.

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There is no performance penalty for highly granular QoS functions.

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IP SLAs allow you to optimize IP business applications for VoIP, video, and data by measuring end-to-end

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service-level and performance metrics.

The Cisco Committed Information Rate (CIR) function helps ensure bandwidth in increments as low as 8

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Kbps.

Rate limiting is provided based on source and destination IP address, source and destination MAC address,

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Layer 4 TCP and UDP information, or any combination of these fields, using QoS ACLs (IP ACLs or MAC

ACLs), class maps, and policy maps.

Asynchronous data flows upstream and downstream from the end station or on the uplink are easily managed

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using ingress policing and egress shaping.

Up to 64 aggregate or individual policers are available per Fast Ethernet or Gigabit Ethernet port.

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Intelligent PoE Management

The Cisco Catalyst 3750 v2 Series PoE models support Cisco IP Phones and Cisco Aironet WLAN access points as

well as any IEEE 802.3af–compliant end device. These are some of the advanced PoE features available:

Cisco Discovery Protocol Version 2 allows the Cisco Catalyst 3750 v2 Series Switch to negotiate a more

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granular power setting when connecting to a Cisco powered device, such as an IP phone or access point,

than what is provided by IEEE classification.

The Per-port power consumption command allows customer to specify the maximum power setting on an

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individual port.

Per-port PoE power sensing measures the actual power being drawn, enabling more intelligent control of

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powered devices.

The PoE MIB provides proactive visibility into power use and enables power policing and troubleshooting.

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Link Layer Discovery Protocol (LLDP) and LLDP for Media Endpoint Devices (LLDP-MED) add support for the

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IEEE 802.1AB LLDP for interoperability in multivendor networks. Switches exchange speed, duplex, and

power settings with end devices such as IP phones.

Management and Control Functions

A working stack is self-managing and self-configuring. When switches are added or removed, the master switch

automatically loads the Cisco IOS Software revision running on the stack to the new switch, loads the global

Data Sheet

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