Your BSCI and CCNP exam results relies upon on knowing the facts, and a person this kind of detail is realizing the appropriate way to summarize routes in OSPF. Route summarization is not just a check of your binary conversion qualities, but understanding wherever and when to summarize routes. It will not surprise any CCNA or CCNP certification applicant that OSPF provides us the most options for route summarization, and as a result much more information to know! OSPF delivers us two options for route forex trading summarization configurations. In a prior tutorial, we looked at the "summary-handle" command, and today we'll look at the appropriate use of the "region array" command. The "region range" command must be utilised on an Spot Border Router (ABR) to summarize routes getting marketed from one OSPF location to yet another. In this tutorial, R1 is acting as an ABR, with interfaces in each Spot and Place 1. 4 loopbacks have been put into R1's Spot 1. anyoption R1(config)router ospf 1 R1(config-router)network 12... .255.255.255 a one R1(config-router)network thirteen... .255.255.255 a one R1(config-router)network 14... .255.255.255 a one R1(config-router)network fifteen... .255.255.255 a one The routing table of an OSPF neighbor, R2, reveals all four routes. R2show ip route ospf 12.../32 is subnetted, 1 subnets O IA twelve.twelve.twelve.twelve one hundred ten/sixty five through 22.214.171.124, 001852, Serial0 13.../32 is subnetted, one subnets O IA thirteen.thirteen.13.thirteen one hundred ten/sixty five through 172.12.123.one, forex charts 001842, Serial0 14.../32 is subnetted, one subnets O IA 126.96.36.199 one hundred ten/sixty five by means of 172.twelve.123.one, 001832, Serial0 fifteen.../32 is subnetted, 1 subnets O IA 15.fifteen.fifteen.15 one hundred ten/65 by way of 172.12.123.one, 001832, Serial0 To hold the routing tables of downstream routers more compact but nevertheless have the desired IP connectivity, we can use the region selection command on R1 to summarize these 4 routes. The essential to preserve in brain with the location array command penny stocks is that the location amount given in the command is the region that contains the destinations, NOT the place that will get the summary route. R1(config)router ospf one R1(config-router)location one array twelve... 252... R2 now displays a single summary route that can be used to attain all four remote networks. R2show ip route ospf O IA 12.../6 110/sixty five by way of 172.twelve.123.one, 000021, Serial0 Apparently sufficient, there's now an extra route in R1's routing table. R1show day trading ip route ospf O twelve.../6 is a summary, 000753, Null0 When you configure summary routes in OSPF, a route to null0 will be mounted into the OSPF routing table of the router accomplishing the summarization. This assists to prevent routing loops. Any packets destined for the routes that have been summarized will have a longer match in the routing table, and packets that do not match a single of the summarized routes but do match the summary route will be dropped.