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Routing Protocol Principle and Configuration
Typology: Lecture notes
Uploaded on 09/27/2017
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Course Outline
GAR#show ip route IPv4 Routing Table: Dest Mask Gw Interface Owner pri metric 10.26.32.0 255.255.255.0 10.26.245.5 fei_1/1 bgp 200 0 10.26.33.253 255.255.255.255 10.26.245.5 fei_1/1 ospf 110 14 10.26.33.254 255.255.255.255 10.26.245.5 fei_1/1 ospf 110 13 10.26.36.0 255.255.255.248 10.26.36.2 gei_5/2.1 direct 0 0 10.26.36.2 255.255.255.255 10.26.36.2 gei_5/2.1 address 0 0 10.26.36.24 255.255.255.248 10.26.36.26 gei_5/2.4 direct 0 0 10.26.245.4 255.255.255.252 10.26.245.6 fei_1/1 direct 0 0 10.26.245.6 255.255.255.255 10.26.245.6 fei_1/1 address 0 0
Static Route (^) The route configured manually by administrator is called static route, which is generally preset when installed the system and it does not change with the network topology automatically.
(^) The default route is an item in the routing table, used to designate how to forward the data unit without a definite next hop address. The packets without definite route items in the routing table will be all forwarded through the interface and next hop address designated by the default route.
Metric
Hop count Hop count
(^) The common path characters used for metric calculation are described below: (^) Hop count: the total number of routes the packet has to pass through. The less the hop count is, the better the route is. The path is usually described by the hop count for getting to the destination. (^) Bandwidth: the capacity of link for transmitting the data. (^) Delay: the time need for sending the data from SA to DA. (^) Load: the activity quantity on the network resources, e.g. router and links. (^) Reliability: refers to the error factor in each network links. (^) MTU: refers to the MTU the port able to send. (^) Each route protocol selects the above one or more characters for metric calculation. (^) There is no comparison between the metrics of different route protocols.
Course Outline
For dynamic routes, an administrator no longer needs to manually maintain the routing table. Instead, it is only necessary to run certain route protocol on each router. The routing protocols will generate route items in the routing table according to the interface configuration (e.g. IP address configuration) and the state of link it connecting to. Dynamic Route Protocol
Autonomous System 65000 Autonomous System 65500 IGPs: RIP, OSPF ISIS EGPs: BGP , EGP (^) an AS is set of networks with the same technology management. (^) IGPs run in an area. (^) EGPs connect different ASs. EGP and IGP
RIP 1 IGRP RIP 2 EIGRP IS-IS OSPF BGP comprehensive performance RIP 1 IGRP RIP 2 EIGRP IS-IS OSPF BGP With route self-loop Without route self-loop