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Flexible Stacking with the GigaStack GBIC
TheCatalyst 3500 Series XL and GigabitEthernet-enabled
Catalyst2900 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. Customers can deploy a 1 Gbps
independent stack backplane in a cascade configuration, or
scale up to 5 Gbps of bandwidth in a star configuration
using the Catalyst 3508G XL Gigabit Ethernetaggregation
switch (See Figure 2). Network managers may use one or
both of the available GBIC ports to create high-speed
uplinks to the network core, using standard Gigabit
Ethernet or Gigabit EtherChannel technology. High levels
of stack resiliency can also be implemented by deploying
dual redundant Gigabit Ethernet Uplinks, a redundant
GigaStack loopback cable, Uplink Fast for high-speed
uplink failover, and per VLAN Spanning Tree (PVST+) for
uplink load balancing. This Gigabit Ethernet flexibility
makes the Catalyst 3500 Series XL an ideal LAN edge
complement to the Cisco Catalyst 6500 family of Gigabit
Ethernet-optimized core LAN switches.
Cisco Switch Clustering
Breakthrough Cisco switch clustering technology enables
up to 16 interconnected Catalyst 3500 XL, Catalyst
2900 XL, and Catalyst 1900 switches—regardless of
geographic proximity—to form a single IP management
domain. Switch-cluster connectivity options for the
Catalyst 3500 Series XL include Ethernet, Fast Ethernet,
Fast EtherChannel, low-cost Cisco GigaStack GBIC,
Gigabit Ethernet, and Gigabit EtherChannel connectivity.
Because the technology is not limited by proprietary
stacking modules or stacking cables, Cisco switch
clustering expands the traditional stacking domain
beyond a single wiring closet. Catalyst 3500 XL switches
can be configured either as command or member switches
in a Cisco switch stack or cluster. The command switch
serves as the single IP address management point
and disbursesallmanagement instructionsdictated bythe
networkadministrator.Commandswitchescanclusterup
to 15 additional interconnected member switches
regardless of interconnection media.
Figure 2 Customers can start with a low-cost GigaStack, GBIC-based, 1 Gbps, independent stack backplane. At any point, users have
the option to increase their stack performance to 5 Gbps using the same GigaStack GBICs In combination with the high-performance
Catalyst 3508G XL Gigabit Ethernet aggregation switch.
Catalyst 3500
Series XL
Catalyst 3500
Series XL
Catalyst 3500
Series XL
Catalyst 3500
Series XL
Catalyst 3500
Series XL
Catalyst 3500
Series XL
Catalyst 3500
Series XL
Catalyst 3500
Series XL
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Cascade with
1-Gbps Forwarding Rate
Catalyst 3500
Series XL
Catalyst 3500
Series XL
Catalyst 3500
Series XL
Catalyst 3500
Series XL
Catalyst 3500
Series XL
GigaStack GBIC
Point to Point at
2-Gbps Forwarding Rate
Catalyst 3508G XL
Gigabit Ethernet or
Gigabit EtherChannel Uplinks
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