Download Administering Cisco QoS in IP Networks by Wayne Lawson PDF

By Wayne Lawson

A growing number of businesses are designing and enforcing distant entry Networks, which enable clients who're now not bodily attached to a large quarter community (WAN) or neighborhood quarter community (LAN) to entry the network's servers, functions and databases or to take part in video conferencing and convention calls. the facility for a distant person to operate as though they have been within the subsequent workplace dramatically improves total potency whereas lowering overall fee of possession. Cisco platforms, the world's greatest internetworking seller, is the pioneer of the permitting applied sciences for distant entry Networks. This ebook will establish and clarify the entire Cisco items invaluable for designing and construction a distant entry community and integrating it with legacy structures. This booklet is a certified reference detailing all the suggestions, strategies and strategies for designing, configuring and protecting Cisco distant entry Networks. it's going to comprise thorough discussions of all Cisco entry Servers and routers. * call for for info on distant entry networks is becoming quick at company and administrator point * Cisco distant entry networks entice companies as they supply effective and safe connectivity at lowered expense * publication contains thorough discussions of all Cisco entry Servers and routers

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Sample text

If the router learns of a lower hop count for a route, it overwrites the existing route with the new route. com 11 110_QoS_01 12 2/13/01 6:35 PM Page 12 Chapter 1 • Cisco IOS Feature Review keeps only the best routes (the lowest hop count) and flushes all other route updates for that destination. If a network were to fail, the downstream router would no longer receive updates about that specific route. After 180 seconds (six updates) without receiving an update on a route, RIPv1 would designate the route as being down by giving it a value of 16.

In addition, keep in mind that hops are not part of the metric calculation for determining the best path, but a limiter to ensure against looping and sub-optimal routing. TIP Distance vector protocols are inadequate in really large network models. Although IGRP implements a stronger metric then RIPv1, it is still a distance vector protocol, which may be substandard for larger networks. To configure IGRP, use the following syntax at the global configuration prompt on the router that you want to configure.

There are many reasons that your network may experience latency or slow periods. com 21 110_QoS_01 22 2/13/01 6:35 PM Page 22 Chapter 1 • Cisco IOS Feature Review latency without bringing any real value to a network. Fortunately, Cisco routers equip you with the tools to manage this type of traffic. Access Control Lists (ACLs), in their simplest form, test a packet against a set of rules. If the packet matches the rules, it is then either permitted or denied. It is critical to note that at the end of every ACL is an implied “deny all” statement.

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