qr code c# tutorial Router(config)# interface type [slot_#/]port_# Router(config-if)# ip ospf cost cost_value in Objective-C

Generate QR Code 2d barcode in Objective-C Router(config)# interface type [slot_#/]port_# Router(config-if)# ip ospf cost cost_value

Router(config)# interface type [slot_#/]port_# Router(config-if)# ip ospf cost cost_value
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Notice that the cost is assigned within an interface This value can range from 1 to 65,535 Note that each vendor might use a different calculation to come up with a cost value It is very important that the costs for a link match for every router on a given segment Mismatched cost values on a segment can cause routers to run the SPF algorithm continually, greatly affecting the routers performance Normally, you won t be changing the default cost values on an interface However, since OSPF uses the inverse of bandwidth as a metric, and serial interfaces default to a bandwidth of 1544 Kbps, you will definitely want to match the bandwidth metric on the serial interface to its real clock rate To configure the bandwidth on your router s interfaces, use the following command:
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Router(config) interface type [slot_#/]port_# Router(config-if)# bandwidth speed_in_Kbps
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TABLE 20-1
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OSPF Costs for Different Interfaces
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20: OSPF Routing
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As an example, if the clock rate were 64,000, you would use the following command to configure the bandwidth correctly: bandwidth 64 Note that the speed is in Kbps for the bandwidth command For example, assume you configured the bandwidth with this: bandwidth 64000 By doing this, the router would assume the bandwidth metric of the interface is 64 Mbps, not Kbps By default, the router will place up to four equal-cost OSPF paths to a destination in the router s routing table This can be increased up to 16 equal-cost paths with the following configuration:
Router(config)# router ospf process_ID Router(config-router)# maximum-paths #_of_max_paths
CertCam ON THE CD
2003The CD contains a multimedia demonstration of changing OSPF metrics on a router
The bandwidth command should be used on synchronous serial interfaces to match the bandwidth metric to the clocked rate of the interface
Synchronous serial interfaces, no matter what they are clocked at, default to a bandwidth metric of 1544 Kbps
OSPF Authentication
OSPF supports authentication of neighbors and routing updates This is used to prevent rogue OSPF routers from injecting bad or misleading routing information into your topological databases Authentication can be done with a clear-text password or a digital signature created with the MD5 algorithm Of the two, the latter is the more secure: clear-text passwords can be seen by an eavesdropper between two OSPF neighbors When using MD5, to prevent against a replay attack where the same information is always sent to a neighbor, such as a hello message, a nondecreasing sequence number is included in the message to ensure that the message and the signature are unique The authentication information is placed in every LSA and validated before being accepted by an OSPF router To become neighbors, the keying information clear-text password or key for the MD5 algorithm must match on the two peers
OSPF Con guration
Remember that if the password/key values on two OSPF neighbors don t match, an adjacency will not occur Of the two methods, using MD5 is definitely much more secure than a clear-text password Configuring authentication is a two-step process: specifying the password/key to use and enabling authentication The configuration of the key is done on an interface-by-interface basis, which means that every neighboring OSPF router off of the same interface must use the password/key Here s the command to configure the password/key value:
Router(config)# interface type [slot_#/]port_# Router(config-if)# ip ospf authentication-key password
Starting in IOS 124, any password greater than eight characters is truncated to eight characters by the router The password is stored in clear text in the router s configuration To encrypt it, use the service password-encryption command, discussed in 11 Next, you must specify whether the password is sent in clear text or used by MD5 to create a digital signature This can be done on the interface or on an area-by-area basis To specify the interface method, use this configuration:
Router(config)# interface type [slot_#/]port_# Router(config-if)# ip ospf authentication [message-digest]
If you omit the message-digest parameter, the key is sent as a clear-text password Your other option is to configure the use of the password/key for an area with which the router is associated:
Router(config)# router ospf process_ID Router(config-router)# area area_# authentication [message-digest]
If you omit the message-digest parameter, the key is sent as a clear-text password Of the two approaches, the latter is the older method: the interface method (former method) was added in IOS 120 and is the preferred approach
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