CISCO PROTOCOLES CONCEPTS DE ROUTAGE ET SCURIT PDF

Uninformed management stations lose access to the router through Before you enable the Management Plane Protection feature, you should understand the following concepts: Examples of protocols processed in the management plane are . Cisco IOS Security Configuration Guide, Release Chapters in a configuration guide describe protocols, configuration tasks, and . Within Cisco IOS software documentation, the term router is generally used to .. concept of a trusted third party that performs secure verification of users and. Last modified by Deonte R. Carroll on Sep 19, AM. Visibility: Open to anyone. nt Routing Protocols and

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Routing Protocol Authentication Concepts and Configuration

There are two general ways that authentication is implemented by most routing protocols: This is generally called load sharing. Routing algorithms that converge slowly can cause routing loops or network outages. Delay depends on many factors, including the bandwidth of intermediate network links, the port queues at each router along the way, network congestion on all intermediate network links, and the physical distance to be traveled. Link-state algorithms also known as shortest path first algorithms flood routing information to all nodes in the internetwork.

Using this terminology, network devices without the capability to forward packets between subnetworks are called end systems ESswhereas network devices with these capabilities are called intermediate systems ISs.

The primary reason for this time lag is that networks in the s were simple, homogeneous environments. Efficiency is particularly important when the software implementing the routing algorithm must run on a computer with limited physical resources. The key chain configuration provides the ability to setup multiple keys that can be used by the supporting features. In the routing loop displayed in Figure: In source-routing systems, routers merely act as store-and-forward devices, mindlessly sending the packet to the next stop.

They can provide substantially better throughput and reliability. Contents 1 What Is Routing? Although bandwidth is a rating of the maximum attainable throughput on a link, routes through links with greater bandwidth do not necessarily provide better routes than routes through slower links.

Some routing algorithms assume that the source end node will determine the entire route. About Affiliates Cisco Systems, Inc. Reliability, in the context of routing algorithms, refers to the dependability usually described in terms of the bit-error rate of each network link. Configure OSPF network authentication. Routers compare metrics to determine optimal routes, and these metrics differ depending on the design of the routing algorithm used.

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In most cases, a scuri determines that it must send a packet to another host. Configuring the use of routing protocol authentication is an easy option that ensures that the device on the other side of a connection is who they say they are.

As it examines the packet’s destination protocol address, the router determines that it either knows or does not know how to forward the packet to the next hop. Optimality refers to the capability of the routing algorithm to select the best route, which depends on the metrics and metric weightings used to make the calculation. Load can be calculated in a variety of ways, including CPU utilization and packets processed per second. A metric is a standard of measurement, such as path bandwidth, that is used by routing cisfo to determine the optimal path to a destination.

Bandwidth refers to the available traffic capacity of a link. This section will describe the process of setting up a key chain for use with RIP and EIGRP then cover the configuration of the specific authentication configuration required by each protocol.

The preceding discussion describes switching between a protocokes and a destination end system.

Article is provided courtesy of Cisco Press. Any reliability factors can be taken into account in the assignment of the reliability ratings, which are arbitrary numeric values usually assigned to network links by network administrators.

On the other hand, link-state algorithms require more CPU power and memory than distance vector algorithms. But how, specifically, are routing tables built? Pprotocoles the router knows how to forward the packet, however, it changes the destination physical address to that of the next hop and transmits the packet. Router 1 therefore forwards the packet to Router 2, but because this router has not yet been updated, it believes that the optimal next hop is Router 1.

Routing Basics

Routing protocols, on the other hand, are protocols that implement routing algorithms. Link-state protocols are generally more scalable than distance vector protocols. Routing systems often designate logical groups of nodes, called domains, autonomous systems, or areas.

Some routing algorithms work only within domains; others work within and between domains. Keep in mind that these authentication solutions do not encrypt the information exchanged between the devices, but simply verifies that the identity of these devices.

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Routing Basics – DocWiki

This includes the ability to have keys that potentially overlap in the time that they are valid. Link-state algorithms, therefore, can be more expensive to implement and support. Dde algorithms assume that hosts know nothing about routes. Communication cost is another important metric, especially because some companies may not care about performance as much as they care about operating expenditures.

Distance vector algorithms also known as Bellman-Ford algorithms call for each router to send all or ds portion of its routing table, but only to its neighbors. Keys can also be configured with specific transmit send and receive accept lifetimes that provide the ability to have keys automatically change at a predetermined time. Second, various types of routing algorithms exist, and each algorithm has a different impact on network and router resources.

If the message indicates that a network change has occurred, the routing software recalculates routes and sends out new routing update messages. Along the way, at least one intermediate node typically is encountered. Dynamic routing algorithms can be supplemented with static routes where appropriate. First, the particular goals of the algorithm designer affect the operation of the resulting routing protocol.

As many routing algorithms become aware of the problem, they will quickly select the next-best path for all routes normally using that segment.

Routing is the act of moving information across an internetwork from a source to a destination. Topics summarized here include routing protocol scuit and algorithms. It stands to reason, therefore, that an optimal intradomain-routing algorithm would not necessarily be an optimal interdomain-routing algorithm. Because delay is a conglomeration of several important variables, it is a common and useful metric. Load refers to the degree to which a network resource, such as a router, is busy.

A router of last resort a router to which all unroutable packets are sentfor example, can be designated to act as a repository for all unroutable packets, ensuring that all messages are at least cisvo in some way.