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Quality of Service

All Catalyst 3500 Series XL switches support LAN edge

QoS based on the Institute of Electrical and Electronic

Engineers (IEEE) 802.1p class of service (CoS), as well as

port-based prioritization. The Catalyst 3524-PWR XL

supports port-based reclassiﬁcation, which allows the

switch to change the CoS settings of tagged packets on

a per-port basis. For untagged packets, the switch uses

the default ingress port priority to classify the packets.

Priority scheduling is applied between the queues, which

ensures that the high priority queue is always serviced

before scheduling the lower priority traffic. These features

enable users to prioritize mission critical traffic, such as

Voice over IP (VoIP) and Enterprise Resource Planning

(ERP)applicationsoverregulartraffic,suchasFileTransfer

Protocol (FTP) or low-priority Web surfing traffic.

Catalyst3500XLand2900XLswitchescanautomatically

conﬁgure Virtual LAN (VLAN) and trusted-extension

settings for IP telephones, which overcomes the

management complexity of overlaying a voice topology

onto a data network and maintaining the quality of voice

trafﬁc. With the auxiliary VLAN feature, network

administrators can segment phones into separate logical

networks even though the data and voice infrastructure is

physically the same. The auxiliary VLAN feature places

the phones into their own VLANs without any end-user

intervention. The user simply plugs the phone into the

switch, and the switch will provide the phone with the

necessary VLAN information. Trusted extension settings

allow the switch to ensure that voice trafﬁc from an IP

phone gets high-priority treatment by controlling how

trafﬁc from a daisy-chained device is classiﬁed.

Resiliency Features

Catalyst 3500 Series XL switches have a number of

hardware- and software-based high-availability features

that prevent network and power outages from disrupting

networkavailability,includinginlinepowerandadvanced

spanning-tree convergence.

Catalyst 3524-PWR XL can provide 48-volt DC power

over standard Category 5 UTP cable up to 100 meters.

Insteadofrequiring wallpower ateverydesktop, terminal

devices such as IP telephones can utilize power provided

from the Catalyst 3524-PWR XL switch. With the Phone

Discovery feature, the Catalyst switch automatically

detects the presence of an IP phone and supplies inline

power. By deploying Catalyst 3524-PWR XL switches

with uninterruptible power supply (UPS) systems in

securedwiringclosets, networkadministratorscanensure

that power outages will not affect a building’s network

telephony connections.

The Cisco Redundant Power System 300 (RPS 300)

provides internal power supply redundancy for up to six

networking devices and features an immediate fail-over

capability. The Cisco RPS 300 can be combined with the

Catalyst3524-PWRSeriesXLdesktopswitchanda UPSto

establish the Cisco Centralized Power Provisioning System.

Dual gigabit uplinks on the Catalyst 3524-PWR XL

switch provide physical uplink redundancy in case the

primary link goes down. Enhanced spanning-tree

convergence features such as Port Fast, Uplink Fast and

Per VLAN Spanning Tree (PVST) ensure rapid

convergence of spanning tree in the case of link failure.

PVST allows usersto implementredundant uplinks while

also distributing trafﬁc loads across multiple links—not

possible with standard shielded twisted pair (STP)

implementations. Cisco Uplink Fast and Cisco Cross

Stack Uplink Fast technologies ensure quick failover

recovery, enhancing network and stack stability and

reliability.

Software Management Features

Cisco Catalyst 3500 Series XL switches include several

exceptional features to increase performance and

manageability for converged networks. To boost

performance, Fast EtherChannel

and Gigabit

EtherChannel technology offer from 400 Mbps to 4 Gbps

high-performance bandwidth among Catalyst switches,

routers, and servers. The Cisco Group Management

Protocol (CGMP) enhances the performance of multimedia

applications and reduces network traffic by allowing a

switch to selectively and dynamically forward IP multicast

traffic to targeted end stations.

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