Figure 3 Half-Duplex GigaStack Cascade Configuration with Legacy Uplink Migration Flexibility
Catalyst 3500
Series XL
Catalyst
2924M XL
Catalyst
2924M 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
Legacy Migration Example
Later Migration to
1000BASE-SX
Current Use Of
100BASE-FX
Catalyst 3548 XL
Switches
Catalyst 2924M XL
Switches
Full-Duplex Configuration Options
Customers can also use the GigaStack GBIC to create a
low-cost dedicated Gigabit Ethernet connection between
two stack members, providing a scalability option to
increase overall stack bandwidth. When connecting
two GigaStack GBICs with a single cable, the GBIC
will autonegotiate to full duplex and provide a 1-Gbps
forwarding rate in each direction—or 2 Gbps. By simply
changing the stack configuration from a cascade to a star
configuration, customers can provide dedicated Gigabit
Ethernet connectivity to each stack member. When
combined with a Catalyst 3508G XL Gigabit Ethernet
aggregationswitch,thissolution offers 5-Gbpsconnectivity
to the stack. The Catalyst 3508G XL can aggregate up to
eight stack member switches or 384 desktop ports,
depending the number and type of uplink ports required.
Users can also choose to implement higher levels of
resiliencyintheir full-duplex GigaStackconfigurations.High
levels of redundancy can be implemented within the wiring
closet stack and on the network core uplinks. Within the
wiring closet, a second Catalyst 3508G XL aggregation
switch can be deployed with redundant links to each stack
member. And, redundant uplinks can be deployed from the
stack aggregator to the network core. When deploying
redundant gigabit uplinks, users can benefit from link
failover times that are significantly shorter than standard
Spanning Tree protocols (STP). By implementing the Cisco
Uplink Fast feature, failover can be minimized to as little as
1 to 2 seconds. In addition, the Cisco Per-VLAN Spanning
Tree (PVST+) feature can be deployed to ensure that all
redundant uplinks perform load balancing. In other words,
all redundant uplinks are active and carry traffic.
Users can achieve even higher levels of performance in
their full-duplex stacks by configuring dual links from an
aggregation switch to each stack member. The two Gigabit
Ethernet ports on each desktop Catalyst 3500 series XL
switchcanbegrouped together using GigabitEtherChannel
®
technology to create a stack connection with a full-duplex
4 Gbps forwarding rate.
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