Qos And Cos Features - Cisco Catalyst 2928 Software Configuration Manual

Chapter 1 Overview
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QoS and CoS Features

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Power over Ethernet Features (WS-C2928-24LT-C only)
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OL-23389-01
Support for IP source guard on static hosts
Dynamic ARP inspection to prevent malicious attacks on the switch by not relaying invalid ARP
requests and responses to other ports in the same VLAN
TACACS+, a proprietary feature for managing network security through a TACACS server
RADIUS for verifying the identity of, granting access to, and tracking the actions of remote users
through authentication, authorization, and accounting (AAA) services
Secure Socket Layer (SSL) Version 3.0 support for the HTTP 1.1 server authentication, encryption,
and message integrity and HTTP client authentication to allow secure HTTP communications
(requires the cryptographic version of the software)
Voice aware IEEE 802.1x security
Classification
– IEEE 802.1p CoS marking priorities on a per-port basis for protecting the performance of
mission-critical applications
Trusted port states (CoS and IP precedence) within a QoS domain and with a port bordering
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another QoS domain
Ingress queueing and scheduling
Two configurable ingress queues for user traffic (one queue can be the priority queue)
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Weighted tail drop (WTD) as the congestion-avoidance mechanism for managing the queue
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lengths and providing drop precedences for different traffic classifications
Thresholds and queue-lengths are predefined and fixed
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Shaped round robin (SRR) as the scheduling service for specifying the rate at which packets are
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sent to the internal ring
Ratios and buffers/thresholds are predefined and fixed
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Egress queues and scheduling
Four egress queues per port
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– WTD as the congestion-avoidance mechanism for managing the queue lengths and providing
drop precedences for different traffic classifications
Thresholds and queue-lengths are predefined and fixed
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SRR as the scheduling service for specifying the rate at which packets are dequeued to the
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egress interface
Ratios and buffers/thresholds are predefined and fixed
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Ability to provide power to connected Cisco pre-standard and IEEE 802.3af-compliant powered
devices from Power over Ethernet (PoE)-capable ports if the switch detects that there is no power
on the circuit.
Support for CDP with power consumption. The powered device notifies the switch of the amount of
power it is consuming.
Catalyst 2928 Switch Software Configuration Guide
Features
1-7