![]() ![]() L 10.0.3.1/32 is directly connected, FastEthernet1/1 L 10.0.2.1/32 is directly connected, FastEthernet1/0Ĭ 10.0.3.0/24 is directly connected, FastEthernet1/1 L 10.0.1.1/32 is directly connected, FastEthernet0/1Ĭ 10.0.2.0/24 is directly connected, FastEthernet1/0 + - replicated route, % - next hop overrideġ0.0.0.0/8 is variably subnetted, 10 subnets, 2 masksĬ 10.0.1.0/24 is directly connected, FastEthernet0/1 O - ODR, P - periodic downloaded static route, H - NHRP, l - LISP Ia - IS-IS inter area, * - candidate default, U - per-user static route I - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2 N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2Į1 - OSPF external type 1, E2 - OSPF external type 2 RIP is still running so RIP routes will replace the removed OSPF routes in the routing table.Ĭodes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGPĭ - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area If not, be careful with this one or you could end up causing problems.Ģ. The traffic will only get as far as R3 where the broken link is and then the traffic is going to fail.įloating static routes will work fine if you have a router to router connection, without other routers along the path. R1 will continue sending traffic along the top path. But if the link from R3 to R2, or R2 to R1 goes down, R1 would not know about it. ![]() In our second example, if the link from R4 to R3 goes down, R4 will detect that and it will work just fine. In our first example, if you do a floating static route as a backup for OSPF and if any of the links from R4 to R1 goes down, OSPF will detect that and the route will be removed from the routing table. But if the link from R4 to R3 goes down, the route will be removed from the routing table and it will use the second route, R4 to R5, instead.Ī word of warning with this. Hence, when routes to the same destination are received from different routing protocols, the router will use the administrative distance to determine the path that it would take.īy configuring the second route to have an AD of 5, only the first route will be placed into the routing table. The router needs to use a different method in order to choose which routing protocol is going to be used. That comparison would be meaningless because every routing protocol calculates its own metric in a completely different way. If there are paths going to the same destination which are coming from different routing protocols, then the receiving router can't compare their metrics with each other.įor example, a RIP hop count of 5 can't be compared to an OSPF cost of 60. All metrics prefer the lowest value therefore, with OSPF, the path A to B to C to D will be taken and will be added into the routing table. OSPF takes the lowest bandwidth into account by default. ![]() Using the same network topology with OSPF, let’s say path A to B to C to D has a cost of 60 and path A to B to D has a cost of 100 because it has lower bandwidth links. ![]()
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