Overview of Routers and Routing
Routers are devices that direct traffic between hosts. They build routing tables that contain collected information on all the best paths to all the destinations that they know how to reach. The steps for basic routing are as follows: Step 1. Routers run programs referred to as routing protocols to both transmit and receive route information to and from other routers in the network. Step 2. Routers use this information to populate routing tables that are associated with eac..
Calculating Network Ranges Using Subnet Masks
Subnetting is the action of taking the assigned network and breaking it up into smaller pieces. Because the prefix length can no longer be classfully assumed just by looking at the address, the prefix length is now specified. For instance, an address might be written 172.20.1.5/23. This slash notation indicates that the first 23 bits are a routing prefix, and are common to all devices on a subnet. Another way of expressing the same address is to create a subnet mask where 1 s..
The point-to-point model is the most robust of the four models—each PVC is treated as a point- to-point subinterface. Therefore, losing a single PVC does not cause loss of connectivity. Instead, each point-to-point subinterface is a separate subnet. Each PVC can have different costs, according to the CIR. Point-to-point has faster convergence than any other model and allows for partial mesh. The point-to-point model has a serious problem with flooding, however..
Useful Native IOS Mode Commands
One of the benefits of the Native IOS Mode is that it implements most of the Layer 2 features found in XDI/CatOS platforms such as the Catalyst 5000. Fortunately, the IOS command-line interface (CLI) has been enhanced to include much of the information previously only found under XDI/CatOS. This section briefly displays and discusses some of the more important enhancements. Probably the most important enhancement involves the interface range command. Without this feature, it..
This feature requires the creation of a boundary between the edge region of the network, where RSVP runs normally, and the core of the network where packets are classified purely using DSCP: Router2#configure terminal Enter configuration commands, one per line. End with CNTL/Z. Router2(config)#interface FastEthernet0/0 Router2(config-if)#ip address 192.168.101.1 255.255.255.0 Router2(config-if)#ip rsvp bandwidth 128 56 Router2(config-if)#ip rsvp data-packet classificat..
