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.

In OSPF, the hub, the designated router (DR). The choice of the DR of the decision is OSPF interface priority, and the default is 1 It is not enough for the Hub of the OSPF interface to 2, said that the router should not be the DR or BDR . She said that the interfaces to an OSPF priority of zero.

R2 (config) # int s0

R2 (config-if) # ip ospf priority 0

This ensures that the rays to the DR or BDR, if the hub is.

The race needs a little more configuration, though. Neighbors of the order must be on the hub to the IP address of the potential neighbors.

R1 (config) # router ospf 1

R1 (config-router) # neighbor 172.12.123.2

R1 (config-router) # neighbor 172.12.123.3

He is to use an ISDN backup OSPF in a network, and if the ISDN connection, the hello packets must be able on the link. What you do not want is that the link up the hellos! With the configuration of the ISDN connection OSPF demand circuit, the link to deposit the lack of transport, but the proximity OSPF, which is on the ISDN connection is assumed by the router still. (You can see, in general, this command configured on both sides of the ISDN connection, but it is necessary, on a page. It’s not all bad for both sides, but.)

R2 (config) # int bri0

R2 (config-if) # ip ospf demand-circuit

One last detail OSPF hub and spoke circuit and the actual demand is performed on layer 2. For the OSPF hello packets are successful ISDN connection or a frame relay network, the broadcast option must be enabled in part on statements and Dialer map. Otherwise, this option may lead to a situation where a ping is successful, but will not be OSPF adjacencies.

R2 (config-if) # dialer map ip 172.12.21.1 name R1 dissemination 5551111

R2 (config-if) # frame map IP 172.12.123.1 221 items

If you are troubleshooting OSPF in a production network or your CCNA / CCNP home lab, not only on the Layer 3 – because everything has rightly, on the physical and data link layer to layer network is functioning correctly!

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