qr code c# sample 19: Basic Routing in Objective-C

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19: Basic Routing
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Remember the output of the show ip route command for the RIP routing protocol, including being able
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to identify the administrative distance and metric values
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To view the routing table, use the show ip route command Here s an example of a RIPv2 router s table:
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Router# show ip route Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP, D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area, N1 - OSPF NSSA external type 1, N2 - OSPF NSSA 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, U - per-user static route, o - ODR, T - traffic engineered route Gateway of last resort is not set 1721600/24 is subnetted, 2 subnets C 1721610 is directly connected, Ethernet0 R 1721620 [120/1] via 1721612, 00:00:21, Ethernet0 19216810/24 is subnetted, 2 subnets C 19216810 is directly connected, Serial0 R 19216820/24 [120/2] via 19216812, 00:00:02, Serial2
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In this example, you can see that two types of routes are in the routing table: R is for RIP and C is for a directly connected route For the RIP entries, you can see two numbers in brackets: the administrative distance of the route and the metric For instance, 1721620 has an administrative distance of 120 and a hop count of 1 Following this information is the neighboring RIP router that advertised the route (1721612), how long ago an update for this route was received from the neighbor (21 seconds), and on which interface this update was learned (Ethernet0)
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1906 The CD contains a multimedia demonstration of the show ip route command for RIP on a router
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The debug ip rip Command
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Remember that the show commands show a static display of what the router knows, and they sometimes don t display enough information concerning a specific issue or problem For instance, you might be looking at your routing table with the show ip route command and expect a certain RIP route to appear from a connected neighbor, but this network is not shown Unfortunately, the show ip route command won t tell you why a route is or isn t in the routing table However, you can resort to debug commands to assist you in your troubleshooting For more detailed troubleshooting of IP RIP problems, you can use the debug ip rip command, shown here:
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Router# debug ip rip RIP protocol debugging is on Router# 00:12:16: RIP: received v1 update from 19216812 on Serial0 00:12:16: 19216820 in 1 hops 00:12:25: RIP: sending v1 update to 255255255255 via Ethernet0 1721611) 00:12:26: network 19216810, metric 0 00:12:26: network 19216820, metric 1
This command displays the routing updates sent and received on the router s interfaces In this code example, the router received a V1 update from 19216812 on Serial0 This update contained one network, 19216820, indicating that this network is reachable from this and the advertising routers After this update, you can see that your router generated a RIP update (local broadcast 255255255255) on its Ethernet0 interface This update contains two networks: 19216810 and 19216820 Also notice the metrics associated with these routes: 19216810 is connected to this router, while 19216820 is one hop away When the neighboring router connected to Ethernet0 receives this update, it will increment the hop count by 1 for each route in the update
Be familiar with the output of the debug ip rip command to troubleshoot problems with RIP, such as a mismatch in the RIP versions Remember
that debug commands can create performance problems on routers and should be used only for troubleshooting and then disabled
19: Basic Routing
If the two routers are running different RIP versions v1 and v2 you ll see output like the following on your router when running the preceding debug command:
00:12:25: RIP: sending v1 update to 255255255255 via Ethernet0 1721611) 00:12:26: network 19216810, metric 0 00:12:26: network 19216820, metric 1 00:12:32: RIP: ignored v2 packet from 19216821 (illegal version)
When using debug commands, you must be at Privilege EXEC mode To disable a specific debug command, negate it with the no parameterTo turn off debugging for all debug commands, use either the undebug all or no debug all command 1907 The CD contains a multimedia demonstration of the debug ip rip command for RIP on a router
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