CCNP BSCI exam and their success depends to know the details, and such a detail, namely, the right way to combine the OSPF routes. The road is not only a test of your ability to convert binary, but knowing where and when to take it remotely. It will not be surprised or CCNA candidates for the CCNP, OSPF gives us the most options for the synthesis, and therefore more details to know!
OSPF offers us two options for a summary of the range of configurations. In a previous tutorial, we have the “Summary Order address and now we are on the proper use of the area range command.
The “spectrum space” command should be used on a surface Border Router (ABR) to summarize routes are proposed by one jurisdiction to another OSPF. In this tutorial, R1 is the ABR, with interfaces in 0 and 1 were four closures R1’s Area 1st
R1 (config) # router ospf 1
R1 (config-router) # network 12.0.0.0 0,255,255,255 A 1
R1 (config-router) # network 13.0.0.0 0,255,255,255 A 1
R1 (config-router) # network 14.0.0.0 0,255,255,255 A 1
R1 (config-router) # network 15.0.0.0 0,255,255,255 A 1
The OSPF routing table neighbor, R2, shows all four lines.
R2 # show ip route ospf
12.0.0.0/32 is subnetted, 1 subnets
O IA 12.12.12.12 [110/65] via 172.12.123.1, 00:18:52, Serial0
13.0.0.0/32 is subnetted, 1 subnets
O IA 13.13.13.13 [110/65] via 172.12.123.1, 00:18:42, Serial0
14.0.0.0/32 is subnetted, 1 subnets
O IA 14.14.14.14 [110/65] via 172.12.123.1, 00:18:32, Serial0
15.0.0.0/32 is subnetted, 1 subnets
O IA 15.15.15.15 [110/65] via 172.12.123.1, 00:18:32, Serial0
For the routing tables of router downstream of the smallest, but always wanted to connectivity IP, we can field the field of command on R1 to take these four lines. The key note in the field of field of the order, the number in the command is the field goals, is not the area is a summary of the route.
R1 (config) # router ospf 1
R1 (config-router) # 1 range 12.0.0.0 252.0.0.0
R2 displays a summary of road may be used for all four remote networks.
R2 # show ip route ospf
O IA 12.0.0.0 / 6 [110/65] via 172.12.123.1, 00:00:21, Serial0
Interestingly enough, there are now more than one route R1 to the routing table.
R1 # show ip route ospf
O 12.0.0.0 / 6 is a summary, 00:07:53, null0
If you configure the routes to OSPF, a route in the east null0 OSPF routing table of the router, the summary. This helps to prevent routing loops. All packages for the lines that boils over in the routing table and packets that are not with one of the routes combined, but with the completion of the route is deleted.
