Routing Fundamentals. What Is Routing? Routing Information. Routing Requirements. Most of the necessary information is contained in the routing table
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1 Routing Fundamentals What Is Routing? Routing is the process of forwarding an item from one location to another Routers forward traffic to a logical destination in a computer network Routers perform two major functions: Routing Learning the logical topology of the network Switching Forwarding packets from an inbound interface to an outbound interface SN v Routing Requirements Routing Information Is the protocol suite active on this device? Is the destination network known to this device? Is there an entry in the routing table? Is the route currently available? Which outbound interface represents the best path? Lowest metric path is preferred Equal lowest metric paths are shared Most of the necessary information is contained in the routing table I [100/118654] via , 00:00:23, Serial0 I -- How the route was learned (IGRP) Destination logical network or subnet [ dministrative distance (trustworthiness factor) /118654] -- Metric value (reachability) via Next-hop logical address (next router) 00:00:23-- ge of entry (in hours:minutes:seconds) Serial0 -- Interface through which the route was learned and through which the packet will leave SN v SN v
2 SN v dministrative Distance dministrative distance is a selection method for IP routing protocols The lower the administrative distance, the more trusted the learning mechanism Manually entered routes are preferred to dynamically learned routes Routing protocols with sophisticated metrics are preferred over protocols with simple metric structures dministrative Distance omparison hart Route Source Default Distance onnected interface 0 Static route out an interface 0 Static route to a next hop 1 EIGRP summary route 5 External GP 20 Internal EIGRP 90 IGRP 100 OSPF 110 IS-IS 115 RIP v1, v2 120 EGP 140 External EIGRP 170 Internal GP 200 Unknown 255 SN v Routing Decisions RIP Routing Metrics Routing protocols maintain a loop-free, single path to each destination network Routes are advertised with a reachability factor referred as a metric The path to the destination network is represented by the sum of the metrics associated with all intermediate links The routing process uses the metric value to select a preferred path to each destination Multiple paths can be used if metric values are equal SN v dir conn Eth0 4.0 dir conn Ser0 R 10.0 [120/4] via 5.2, Eth0 R 10.0 [120/4] via 5.3, Eth0 R 10.0 [120/4] via 5.4, Eth0 Routing metric used by RIP is hop count Using a neighboring router interface is a hop Routing process arbitrarily selects a path from several possible equal metric paths IP load balancing is enabled by default TR FDDI These addresses are all part of the network 10.0 SN v
3 SN v IGRP Routing Metrics lassful Routing Overview These addresses are all part of the network TR FDDI 5.0 dir conn Eth0 4.0 dir conn Ser0 I 10.0 [100/327684] via 5.4, Eth0 Routing metric used by IGRP is composite andwidth, delay, reliability, load, MTU Routing process selects the fastest path IP load balancing is enabled by default lassful routing protocols are a consequence of the distance vector method of route calculation RIPv1 IGRP Routing masks are not carried within the periodic routing updates Within a network, consistency of masks is assumed SN v lassful Routes lassless Routing Overview Subnetwork routes are shared by devices within the same network Summary routes are exchanged between foreign networks Summary routes are automatically created at lass,, and network boundaries lassless routing protocols include the routing mask with the route advertisement OSPF EIGRP RIPv2 IS-IS GP Summary routes can be manually controlled within the network SN v SN v
4 SN v lassless Subnetting Requirements Distance Vector Routing Update Traffic requirement for only two host addresses VLSM support accommodates this S1 E / /30 ll Routes S / /27 E0 E /27 Router interfaces within the same network can have different subnet masks Variable-length subnet masking (VLSM) is supported This approach maximizes allocation of available host addresses In a distance vector environment, routing updates are propagated only to directly connected neighbors SN v Link-State Routing Update Traffic One Route In a link-state environment, link-state announcements are propagated to all devices in the routing domain Hierarchical design can limit the requirement to notify all devices SN v onvergence onvergence time is the time it takes for all routers to agree on the network topology after a change such as: New routes being added Existing routes changing state onvergence time is affected by: Update mechanism (hold-down timers) Size of the topology table Route calculation algorithm Media type SN v
5 SN v Routing Updates Different ways to send route information Updates RIPv1 network Routing Table Distance Vector pproach Full Table /24 Routing Table Link-State pproach Single Entry SN v Updates RIPv1 network Updates RIPv1 network / /24 Routing table /16 / /24 Routing table /16 OSPF network /24 /24 SN v SN v
6 SN v Routing Updates RIPv1 Network / /24 OSPF Network / /24 /24 /24 /16 /24 s Entries are listed in an efficient search order Simplifies the search mechanism Multiple paths to a common destination can be listed Load balancing is enabled by default for IP Displayed by the show ip route command Entries can be refreshed by the clear ip route command To specify a single entry, use network number To specify all entries, use wildcard character (*) SN v Sample ackbone_r1#show ip route odes: - connected, S - static, I - IGRP, R - RIP, M - mobile, - GP D - EIGRP, EX - EIGRP external, O- OSPF, I - OSPF inter area N1 - OSPF NSS external type 1, N2 - OSPF NSS external type 2 E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, * - candidate default Gateway of last resort is to network /24 is subnetted, 2 subnets is directly connected, Loopback is directly connected, Loopback101 O E /16 [110/20] via , 01:03:01, Serial1/2 [110/20] via , 01:03:01, Serial1/3 [110/20] via , 01:03:01, Serial1/4 O E /24 [110/20] via , 01:03:01, Serial1/3 O E /24 [110/20] via , 01:03:01, Serial1/ /24 is subnetted, 4 subnets is directly connected, Serial1/ is directly connected, Serial1/ is directly connected, Serial1/ is directly connected, Serial1/0 O E /24 [110/20] via , 01:03:02, Serial1/2 S* /0 [1/0] via SN v
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