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Le Blog de KevinBarnett1986
12 novembre 2012
0 voteVotez ! forex Cisco CCNP BSCI Exam Tutorial Using The OSPF Command Area Ra...

Your BSCI and CCNP examination success depends on realizing the particulars, and a single these kinds of detail is understanding the correct way to summarize routes in OSPF. Route summarization is not just a test of your binary conversion talents, but understanding exactly where and when to summarize routes. It will not surprise any CCNA or CCNP certification applicant that OSPF offers us the most choices for route summarization, and thus additional information to know!
OSPF provides us two alternatives for route   anyoption summarization configurations. In a prior tutorial, we looked at the "summary-handle" command, and right now we'll appear at the proper use of the "area array" command.
The "region range" command need to be employed on an Area Border Router (ABR) to summarize routes getting marketed from a person OSPF spot to yet another. In this tutorial, R1 is acting as an ABR, with interfaces in both Region and Location 1. Four loopbacks have been positioned into R1's Region 1.  forex trading
R1(config)router ospf one
R1(config-router)network twelve... .255.255.255 a one
R1(config-router)network 13... .255.255.255 a one
R1(config-router)network 14... .255.255.255 a one
R1(config-router)network fifteen... .255.255.255 a 1
The routing table of an OSPF neighbor, R2, exhibits all four routes.
R2show ip route ospf
twelve.../32 is subnetted, 1 subnets
O IA twelve.12.12.12 110/65 through 172.12.123.one, 001852, Serial0
thirteen.../32 is subnetted, 1 subnets
O IA 13.thirteen.13.thirteen 110/sixty five via 172.12.123.1,   market trading 001842, Serial0
14.../32 is subnetted, 1 subnets
O IA 14.14.14.14 110/65 through 172.twelve.123.one, 001832, Serial0
fifteen.../32 is subnetted, 1 subnets
O IA 15.15.15.15 one hundred ten/65 via 172.12.123.1, 001832, Serial0
To maintain the routing tables of downstream routers scaled-down but nevertheless have the sought after IP connectivity, we can use the location array command on R1 to summarize these four routes. The important to preserve in intellect with the place selection command   daytrading6636.com is that the spot amount given in the command is the region that contains the locations, NOT the location that will receive the summary route.
R1(config)router ospf 1
R1(config-router)region one variety twelve... 252...
R2 now demonstrates a simple summary route that can be utilised to reach all 4 remote networks.
R2show ip route ospf
O IA twelve.../six 110/sixty five by way of 172.twelve.123.one, 000021, Serial0
Interestingly adequate, there's now an further route in R1's routing table.
R1show  forex  ip route ospf
O 12.../six 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 executing the summarization. This helps to stop routing loops. Any packets destined for the routes that have been summarized will have a for a longer time 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.


 

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