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Catalyst 2950 Desktop Switch Software Configuration Guide
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Chapter 1 Overview
Network Configuration Examples
Multidwelling Network Using Catalyst 2950 Switches
A growing segment of residential and commercial customers are requiring high-speed access to Ethernet
metropolitan-area networks (MANs). Figure 1-6 shows a configuration for a Gigabit Ethernet MAN ring
using Catalyst 3550 multilayer switches as aggregation switches in the mini-point-of-presence (POP)
location. These switches are connected through 1000BASE-X GBIC ports.
The resident switches can be Catalyst 2950 switches, providing customers with high-speed connections
to the MAN. Catalyst LRE Layer 2 only switches also can be used as residential switches for customers
requiring connectivity through existing telephone lines. The Catalyst LRE switches can then be
connected to another residential switch or to an aggregation switch. For more information about the LRE
switches, refer to the Catalyst 2950 Series Hardware Installation Guide.
All ports on the residential Catalyst 2950 switches (and Catalyst LRE switches if they are included) are
configured as 802.1Q trunks with protected port and STP root guard features enabled. The protected port
feature provides security and isolation between ports on the switch, ensuring that subscribers cannot
view packets destined for other subscribers. STP root guard prevents unauthorized devices from
becoming the STP root switch. All ports have IGMP snooping or CGMP enabled for multicast traffic
management. ACLs on the uplink ports to the aggregating Catalyst 3550 multilayer switches provide
security and bandwidth management.
The aggregating switches and routers provide services such as those described in the previous examples,
“Small to Medium-Sized Network Configuration” and “Large Campus Configuration.”