In this lab, you configure VLSM and test its functionality with two different routing protocols, RIPv1 and RIPv2. Finally, you use IP unnumbered in place of VLSM to further conserve addresses. | Configuring VLSM and IP Unnumbered Host B 27 Host A Objective In this lab you configure VLSM and test its functionality with two different routing protocols RIPv1 and RIPv2. Finally you use IP unnumbered in place of VLSM to further conserve addresses. Scenario When International Travel Agency was much smaller it wanted to configure its network using a single Class C address shown in the figure . You are asked to configure the routers with the appropriate addresses. The company requires that at least 25 host addresses be available on each LAN but it also demands that you conserve the maximum number of addresses for future growth. To support 25 hosts on each subnet a minimum of 5 bits is needed in the host portion of the address. 5 bits will yield 30 possible host addresses 25 32 - 2 . If 5 bits must be used for hosts the other 3 bits in the last octet can be added to the default 24-bit Class C mask. Thus a 27-bit mask can be used to create the following subnets I 192 32 27 27 27 129 27 192 169 Z27 192 166 1 192 27 27 0 30 192 168 1 4 rao 0 30 12 30 16. 30 192 2B 30 1 - 3 Semester 5 Advanced Routing - Lab Copyright 2001 Cisco Systems Inc. To maximize this address space the 27 subnet is subnetted further using a 30-bit mask. This creates subnets that can be used on point-to-point links with minimal waste because each subnet can contain only two possible host addresses. Step 1 Build and configure the network according to the diagram previously shown. This configuration requires the use of subnet 0 so you might need to enter the ip subnetzero command depending on which IOS version you are using. Note Host A and Host B are not required to complete this lab. On all three routers configure RIPv1 and enable updates on all active interfaces with this network command SanJose1 config router .
