CIDR is a convention defined in RFCs 1517 through 1520 that calls for aggregating routes for multiple classful network numbers into a single routing table entry. The primary goal of CIDR is to improve the scalability of Internet routers’ routing tables. Imagine the implications of an Internet router being burdened by carrying a route to every class A, B, and C network on the planet! CIDR uses both technical tools and administrative strategies to reduce the size of the Inter..
Types of Internetworking Devices
Cisco devices fall into three main categories: bridges and switches, routers, and access servers. We discuss bridges and switches first. Bridges and Switches A bridge is a network device that operates at the data link layer. A bridge connects multiple data link layer network segments into a single logical network segment. There are many different types of bridges: • Transparent or learning • Encapsulation • Translational • Source-route •&n..
The following configuration command adjusts the default packet size for all SNMP packets leaving the router: Router#configure terminal Enter configuration commands, one per line. End with CNTL/Z. Router(config)#snmp-server packetsize 1480 Router(config)#end Router# By default, Cisco routers limit their SNMP packet size to 1,500 bytes. It is usually not necessary to change this parameter. However, it may be useful to reduce it if your network has an MTU of less than 1,..
NetFlow switching has given way to a more efficient form of multilayer switching: Cisco Express Forwarding. Cisco developed CEF for its line of routers, offering highperformance packet forwarding through the use of dynamic lookup tables. CEF also has been carried over to the Catalyst switching platforms. The following platforms all perform CEF in hardware: ■ Catalyst 6500 Supervisor 720 (with an integrated MSFC3) ■ Catalyst 6500 Supervisor 2/MSFC2 combination ■ Catalys..
Frame Relay Traffic Shaping Explained
Cisco's Frame Relay Traffic Shaping feature provides many parameters for handling users' traffic and managing congestion on Frame Relay networks. With Frame Relay Traffic Shaping, users are able to configure rate enforcement to either the CIR level or to other user-defined values on a per-VC basis. In this way, bandwidth can be flexibly allocated to each VC and tailored to specific requirements. This allows the feature to provide a mechanism for sharing a common Frame Relay c..
