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Catalyst 2900 Series XL and Catalyst 3500 Series XL Software Configuration Guide
78-6511-08
Chapter 1 Overview
Network Configuration Examples
Multidwelling Configuration
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 6500 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 2900 XL and Catalyst 3500 XL switches, providing customers
with either Fast Ethernet or Gigabit Ethernet connections to the MAN. Catalyst 2900 LRE XL switches
can also be used as residential switches for customers requiring connectivity through existing telephone
lines. The Catalyst 2900 LRE XL switches can then connect to another residential switch through a
10/100 connection.
All ports on the residential switches are configured as 802.1Q trunks with the protected port and STP
root guard options enabled. The protected port option 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 CGMP enabled for
multicast traffic management.
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