Cisco TCP/IP Routing Professional Reference by Chris Lewis

By Chris Lewis

The most recent details for imposing TCP/IP over Cisco routersThoroughly up to date and elevated, Cisco TCP/IP specialist Reference, 3rd variation, through Chris Lewis, delivers all of the newest details on Cisco's subsequent new release of routers, together with sections on Cisco seven hundred, 800, 1600, 1700, 2600, 3600, 7100, 7200, and 7500. Plus transparent, step by step directions for each point of operating TCP/IP over Cisco routers. All configuration examples replicate implementation on a 2600 platform with IOS model 11.0 or 12.0, as applicable. New sections deal with VPN implementation, administration and security...IOS firewall features...and Cisco defense scanning. you are proven how one can aid renowned legacy networks... construct a TCP/IP router-based community, from deciding upon your ambitions to assembling the pattern internetwork...and take on troubleshooting matters. there is no extra entire source to be had wherever!

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It does not matter what number you assign as the Autonomous System number in this case. All you need do is assign the same number to all three router IGRP processes. IGRP processes simply will exchange route information with other processes belonging to the same Autonomous System number. The two network entries are there to tell IGRP what networks to advertise in its initial IGRP packet. The rule to follow is that you must configure a network entry for each directly connected network number. Note that, because IGRP does not send subnet mask information in its updates, the entries here are concerned only with network (not subnetwork) numbers.

Once a routing device receives an update, it processes the new information, which it compares with that in the existing routing table. If the routing update includes a new destination network, it is added to the routing table. If the router receives a route with a smaller metric to an existing destination, it replaces the existing route. If an entry in the update message has the same destination network and gateway but a different metric, it will use the new metric to update the routing table. This covers how routers handle a static network using RIP; some additions to the protocol are in place to handle changes in topology, such as a downed link.

End 48 49 Figure 3-13: Router 3 configured for subnets Note that when configuring IGRP, the same network number is defined on each router. In this case, when IGRP advertisements are received, it is assumed that the same subnet mask is used on all interfaces on the internetwork and the correct entries in the routing tables are then made. 64 is directly connected, Serial0 An interesting point is that the network number that is tracked in the routing table is a derived value. By looking at both the assigned IP address and the subnet mask, the subnetwork number is calculated.

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