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Catalyst 2950 Desktop Switch Software Configuration Guide
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Chapter 1 Overview
Network Configuration Examples
You can create backup paths by using Fast Ethernet, Gigabit, Fast EtherChannel, or Gigabit
EtherChannel links. Using Gigabit modules on two of the switches, you can have redundant uplink
connections to a Gigabit backbone switch such as the Catalyst 3550-12G switch. If one of the
redundant connections fails, the other can serve as a backup path. You can configure the stack
members and the Catalyst 3550-12G switch as a switch cluster to manage them through a single IP
address.
• High-performance workgroup—For users who require high-speed access to network resources, use
Gigabit modules to connect the switches directly to a backbone switch in a star configuration. Each
switch in this configuration provides users with a dedicated 1-Gbps connection to network resources
in the backbone. Compare this with the switches in a GigaStack configuration, where the 1-Gbps
connection is shared among the switches. With the high speed uplink to the distribution server, the
user can efficiently obtain and store data from servers. Using these Gigabit modules also provides
flexibility in media and distance options:
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1000BASE-T GBIC: copper connections of up to 328 feet (100 meters)
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1000BASE-SX GBIC: fiber-optic connections of up to 1804 feet (550 meters)
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1000BASE-LX/LH GBIC: fiber-optic connections of up to 32,808 feet (10 kilometers)
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1000BASE-ZX GBIC: fiber-optic connections of up to 328,084 feet (100 kilometers)
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GigaStack GBIC module for creating a 1-Gbps stack configuration of up to nine supported
switches. The GigaStack GBIC supports one full-duplex link (in a point-to-point configuration)
or up to nine half-duplex links (in a stack configuration) to other Gigabit Ethernet devices.
Using the required Cisco proprietary signaling and cabling, the GigaStack GBIC-to-GigaStack
GBIC connection cannot exceed 3 feet (1 meter).
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Catalyst 2950 LRE switches support SFP GBIC as well as 10/100/1000 copper connections
• Redundant Gigabit backbone—Using HSRP, you can create backup paths between
Catalyst 3550-12T-L3 switches. To enhance network reliability and load balancing for different
VLANs and subnets, you can connect the Catalyst 2950 switches, again in a star configuration, to
two backbone switches. If one of the backbone switches fails, the second backbone switch preserves
connectivity between the switches and network resources.