OSPF network configuration example in Objective-C

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OSPF network configuration example
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must be an exact match against the address on the router s interface in order to place it in area 0 Here s another example that accomplishes the same thing:
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Router(config)# router ospf 1 Router(config-router)# network 10000 0255255255 area 0 Router(config-router)# network 1721600 00255255 area 0
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In this example, interfaces beginning with an address of 10 or 17216 are to be included in area 0 Or, if all the interfaces on your router belonged to the same area, you could use this configuration:
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Router(config)# router ospf 1 Router(config-router)# network 0000 255255255255 area 0
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In this example, all interfaces are placed in area 0 As you can see, OSPF is very flexible in allowing you to specify which interface or interfaces will participate in OSPF and to which area they will belong
CertCam ON THE CD
2001The CD contains a multimedia demonstration of configuring OSPF on a router
Loopback Interfaces
A loopback interface is a logical, virtual interface on a router By default, the router doesn t have any loopback interfaces, but they can be easily created All IOS platforms support loopback interfaces, and you can create as many of these interfaces as you need These interfaces are treated as physical interfaces on a router: you can assign A loopback interface is addressing information to them, include their a logical interface that always remains network numbers in routing updates, and even up Use the interface loopback terminate IP connections on them, such as command to create it telnet and SSH Here are some reasons you might want to create a loopback interface:
To assign a router ID to an OSPF router To use for testing purposes, since this interface is always up To terminate special connections, such as GRE tunnels or IPSec connections,
since this interface is always up
20: OSPF Routing
The router ID for OSPF is chosen when the OSPF routing process is started This occurs when you execute the router ospf command manually or when the router s configuration is loaded when booting upTherefore, if you create a loopback interface after enabling OSPF, the loopback won t be used as the router ID; however, if you reboot the router, the loopback interface will be used, by defaultTherefore, I recommend that you create your loopback interface and assign an IP address to it first and then enable OSPF to eliminate any confusion about what your router s router ID is To create a loopback interface, use the following command:
Router(config)# interface loopback port_# Router(config-if)# ip address IP_address subnet_mask
As you can see, creating a loopback interface is easy You can specify port numbers from 0 to 2147483647 The number you use is only locally significant Once you enter the loopback interface, you can execute almost any interface command on it; for instance, you can assign it an IP address with the ip address command
CertCam ON THE CD
2002The CD contains a multimedia demonstration of creating a loopback interface on a router
Default Route Propagation
On your perimeter OSPF router connected to the ISP, you typically have a default route pointing to the ISP To take this route and redistribute it into your OSPF process, basically making your perimeter router an autonomous system boundary router (ASBR), use the following configuration:
Router(config)# ip route 0000 0000 ISP_interface_or_IP_address Router(config)# router ospf process_ID Router(config-router)# default-information originate
Make sure your default route doesn t point to your internal
network, but your ISP s network; otherwise you ll be creating a routing loop
OSPF Con guration
OSPF Metric Values
You can affect the cost metric that OSPF uses in picking the best-cost routes for the routing table in two ways First, remember that the cost metric is the inverse of the accumulated bandwidth values of routers interfaces The default measurement that Cisco uses in calculating the cost metric is: cost = Remember the OSPF 108/(interface bandwidth) You can also affect the interface costs in Table 20-1, especially for value of the cost by changing the 108 value with serial connections the auto-cost reference-bandwidth command Table 20-1 contains some default costs for different interface types To change the cost of an interface manually, use the following configuration:
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