Cisco 2950 Software Configuration Guide - Page 55

Chapter 1 Overview Network Configuration Examples All ports on the residential Catalyst 2950 and 2955 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." Figure 1-7 Catalyst 2950 Switches in a MAN Configuration Cisco 12000 Gigabit switch routers Catalyst 6500 switches Si Service Provider POP Si Catalyst 3550 Si multilayer switches Si Si Mini-POP Si Gigabit MAN Si Si Catalyst switches Set-top box TV Residential location Residential gateway (hub) Set-top box PC TV 50833 78-11380-10 Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide 1-21