Analysis on the route protocol of Cisco router configuration

Routing ProtocolThere are two parts: staticRoutingAnd dynamic routing. Use Dynamic Routing ProtocolVroYou can automatically learn the path information to the remote network. Static Routing does not require the network manager to manually add the path to the destination network to the routing table.

Static Routing is suitable for small and infrequently changing networks, and dynamic routing is suitable for large networks. In this way, the Network Administrator does not need to manually change the route information to change the path, the vro automatically adapts to changes in the network topology.

The following articles describe how to configure static routes and dynamic routes. We will introduce the configuration methods of these routing protocols in the form of various instances.

Static Routing and default routing configuration methods:

How to configure static routes and Instances

By configuring Static Routing, You can manually specify the path to access a certain network. The network structure is relatively simple, generally, Static Routing is used when the path to a network is unique.

Default route Configuration

The default route is generally used in the stub network, and the stub network is a network with only one egress path. Use the default route to send packets that are not included in the route table of the target network. In fact, you can understand the default route as a static route with a wildcard (wildcard.

Dynamic Routing Protocol configuration method:

IGRP dynamic Protocol Configuration

IGRP (Interior Gateway Routing Protocol) is a dynamic distance vector Routing Protocol designed by Cisco In The Middle Of 1980s. Use a combination of user configuration scales, including latency, bandwidth, reliability, and load. By default, IGRP sends a route update broadcast every 90 seconds. No update is received from the first vro in the route within three update cycles (that is, 270 seconds, the route is declared inaccessible. After 7 update cycles, namely 630 seconds, the Cisco IOS software clears the route from the route table.

Configuration of the dynamic protocol of the source node.

VPN is a private routing protocol of Cisco. It combines the advantages of Distance Vector and link state. It uses Diffusing Update algorithm (DUAL) to achieve fast convergence. The router uses vrouters to store all the backup routes that reach the destination for fast switching. If there is no suitable or backup route in the local route table.

The router queries its neighbors to select a backup route. No periodic update is performed on the network. only partial update is performed after the route path and degree change. After the path information changes, DUAL only sends the updated route information instead of the entire route table. Compared with the link status routing protocol transmitted to all routers in a region, DUAL only sends updates to the routers that need the update information.

OSPF dynamic Protocol Configuration

OSPF (Open Shortest Path First) is an internal gateway protocol used for decision routing in a single autonomous system (. OSPF is a link state routing protocol. It establishes a link state database by notifying the status of network interfaces between routers to generate a shortest path tree. Each OSPF router uses these Shortest Paths to construct a route table.

The introduction of the routing protocol is described here. I hope you can understand it.