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• Catalyst 3524 XL—A single RU stackable 10/100 and

Gigabit Ethernet switch with 24 10BaseT/100BaseTX ports

and two GBIC-based Gigabit Ethernet ports. The Catalyst

3524 XL is ideal for delivering dedicated 10 or 100 Mbps

to individual users and servers in a stack or cluster

configuration. Built-in dual GBIC-based Gigabit Ethernet

ports provide users with a flexible and scalable solution for

Gigabit Ethernet uplinks or GigaStack GBIC stacking.

• Catalyst 3508G XL—A single RU stackable Gigabit

Ethernet switch with eight GBIC-based Gigbit Ethernet

ports. The Catalyst 3508G XL is ideal for aggregating a

group of 10/100 and Gigabit Ethernet switches and

Gigabit Ethernet servers through Cisco GigaStack GBICs

or standard 1000BaseX GBICs.

• GigaStack GBIC—A versatile, low-cost, Gigabit Ethernet

stacking GBIC that offers high-speed interconnectivity

between Catalyst 3500 series XL and gigabit-enabled

Catalyst 2900 series XL switches. The GigaStack GBIC is

ideal for performance- and cost-conscious customers who

require an independent stack bus to interconnect multiple

Catalyst 3500 XL and gigabit-enabled Catalyst 2900 XL

switches.

The Cisco Scalable Stacking Architecture

Cisco Systems, the leader in internetworking solutions,

provides the industry’s most ﬂexible, scalable, and

manageable stacking architecture for Catalyst 3500 series

XL and gigabit-enabled Catalyst 2900 series XL switches.

Flexible Stacking

The Catalyst 3500 series XL and gigabit-enabled Catalyst

2900 series XL switches can be stacked using the low-cost

Cisco GigaStack GBIC. The two-port GigaStack GBIC

offers a range of highly ﬂexible stacking and performance

options. It delivers 1-Gbps connectivity in a daisy-chained

conﬁguration or up to 2-Gbps full-duplex connectivity in a

dedicated switch-to-switch conﬁguration.

Figure 1 GigaStack GBIC Connection Options

Cisco Switch Clustering

BreakthroughCiscoSwitchClusteringtechnologyenablesup

to 16 interconnected Catalyst 3500 XL, 2900 XL, and

Catalyst 1900 switches, regardless of geographic proximity,

toform amanaged singleIP address network. These switches

can be clustered using a broad range of standards-based

connectivityoptions, to delivervarying levels ofperformance

to meet customer requirements. Clustering connectivity

options for the Catalyst 3500 series XL include Ethernet,

FastEthernet,FastEtherChannel

,low-costCiscoGigaStack

GBIC, Gigabit Ethernet, and Gigabit EtherChannel. Because

thetechnologyisnotlimitedbyproprietarystackingmodules

and stacking cables, Cisco Switch Clustering expands the

traditional stacking domain beyond a single wiring closet

and lets users “mix and match” interconnections to meet

speciﬁc management, performance, and cost requirements as

shown in Figure 1.

In a Cisco Switch Cluster, one Catalyst 3500 series XL

or 2900XL switchis speciﬁed asthe “command”switch and

all other switches in the cluster are designated as “member”

switches.Thecommand switch serves asthesingleIP address

management point and disburses all management action

dictated by the network administrator. Command switches

can cluster up to additional 15 interconnected member

switches regardless of their interconnection media. Cisco

Switch Clustering command software is preinstalled on all

Catalyst 3500 series XL switches and is available as an

upgrade for Catalyst 2900 series XL switches with the

Catalyst 2900 XL Command Software upgrade kit.

GigaStack GBIC

Daisy Chain at

1-Gbps Forwarding Rate

Point to Point at

2-Gbps Forwarding Rate

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