ip ospf and ipv6 ospf Commands

The ip ospf commands have two effects on interface configuration. These effects apply to all ip ospf commands:

• Configuration per logical IP interface (for example, Fast Ethernet 0/1.3 or ATM 5/0.1):

  The ip ospf command configures the specified OSPF parameters for all networks configured on the given IP interface—for example, all multinetted addresses on an interface.

  The no version of the command resets the specified parameters to unspecified.

  If the no version of the command takes effect for a specified IP interface, there is no default value for the specified parameters. The parameter is set back to unspecified values. However, the value of the specified parameter for the OSPF interface is set back to the default value or the value previously specified by the address command.

  Note: The ip ospf commands configure OSPF attributes for all OSPF networks in the given interface context—for example, in a multinet environment where multiple IP networks sit on top of an Ethernet interface. The address commands configure OSPF attributes for a single OSPF interface.

• Configuration per OSPF interface:

  The ip ospf command configures the specified OSPF parameters for each OSPF interface that sits on top of the IP interface.

  The no version of the command restores the specified parameters to the default values.

  Note: We recommend using address commands to set attributes of OSPF interfaces created using the address area command.

ipv6 ospf area

• Use to create an OSPFv3 interface under the specified area ID or move the OSPFv3 interface from its current area to the specified area.
• Specify an optional process ID in the range 1–65535.
• Example

  host1(config)#interface fastethernet 0/0

  host1(config-if)#ipv6 ospf area 50

• Use the no version to remove this interface from the specified area.
• See ipv6 ospf area

ip ospf cost

ipv6 ospf cost

• Use to configure the cost of sending a packet on the network.
• Cost is a metric value in the range 0–65535; the default value is 1.
• The router LSA advertises the link-state metric as the link cost.
• For the IPv6 command, you can specify an optional process ID in the range 1–65535.
• Example 1

  host1(config)#interface fastethernet 0/0

  host1(config-if)#ip ospf cost 50

• Example 2

  host1(config)#interface fastethernet 0/0

  host1(config-if)#ipv6 ospf cost 50

• Use the no version to reset the path cost to the default value, 1.
• See ip ospf cost
• See ipv6 ospf cost

ip ospf dead-interval

ipv6 ospf dead-interval

• Use to configure the interval since the last hello packet was seen.
• Specify an interval in the range 0–2147483647 seconds; the default value is 40 seconds.
• For the OSPF routers to become adjacent, the dead interval must be identical on each router.
• The router’s hello packets advertise this interval.
• For the IPv6 command, you can specify an optional process ID in the range 1–65535.
• Example 1

  host1(config-if)#ip ospf dead-interval 60

• Example 2

  host1(config-if)#ipv6 ospf dead-interval 60

• Use the no version to restore the default value, 40 seconds.
• See ip ospf dead-interval
• See ipv6 ospf dead-interval

ip ospf hello-interval

ipv6 ospf hello-interval

• Use to configure the interval between hello packets.
• Specify an interval in the range 1–65535 seconds; the default value is 10 seconds.
• For the OSPF routers to become adjacent, the hello interval must be identical on each router.
• For the IPv6 command, you can specify an optional process ID in the range 1–65535.
• Example 1

  host1(config-if)#ip ospf hello-interval 8

• Example 2

  host1(config-if)#ipv6 ospf hello-interval 8

• Use the no version to restore the default value, 10 seconds.
• See ip ospf hello-interval
• See ipv6 ospf hello-interval

ipv6 ospf mtu-ignore

• Use to specify that the interface disregard the MTU size contained in the data description packet.
• When enabled, the interface accepts data description packets from its neighbor even if it has a different MTU size (the MTU size must be less than 18000).
• Specify an optional process ID in the range 1–65535.
• Example

  host1(config-if)#ipv6 ospf mtu-ignore

• Use the no version to reset the default: that the neighbor MTU size must match the MTU size of the OSPFv3 interface from which the packet is received.
• See ipv6 ospf mtu-ignore

ipv6 ospf network

• Use to configure the OSPF network type for an interface.
• Specify a network type (broadcast or point-to-point) for the interface.
• Example

  host1(config)#interface fastethernet 0/0

  host1(config-if)#ipv6 ospf network broadcast

• Use the no version to revert the network type to the default for the interface.
• See ipv6 ospf network

ip ospf priority

ipv6 ospf priority

• Use to configure the router’s priority.
• Select a priority level in the range 0–255; the default value is 1.
• This setting determines the designated router for the particular network.
• A router whose priority is set to 0 cannot be a designated router.
• Configure priority only for interfaces to multiaccess networks.
• For the IPv6 command, you can specify an optional process ID in the range 1–65535.
• Example 1

  host1(config-if)#ip ospf priority 2

• Example 2

  host1(config-if)#ipv6 ospf priority 2

• Use the no version to restore the default value, 1.
• See ip ospf priority
• See ipv6 ospf priority

ip ospf retransmit-interval

ipv6 ospf retransmit-interval

• Use to configure the time interval between retransmission of an LSA.
• Specify an interval in the range 0–3600 seconds; the default value is 5 seconds.
• For the IPv6 command, you can specify an optional process ID in the range 1–65535.
• Example 1

  host1(config-if)#ip ospf retransmit-interval 10

• Example 2

  host1(config-if)#ipv6 ospf retransmit-interval 10

• Use the no version to return to the default value, 5 seconds.
• See ip ospf retransmit-interval
• See ipv6 ospf retransmit-interval

ip ospf transmit-delay

ipv6 ospf transmit-delay

• Use to configure the time it takes to transmit a link-state update on the interface.
• This is the time between transmissions of LSAs.
• Specify an interval in the rang 0–3600 seconds; the default value is 1 second.
• In setting the time, consider the interface’s transmission and propagation delays.
• For the IPv6 command, you can specify an optional process ID in the range 1–65535.
• Example 1

  host1(config-if)#ip ospf transmit-delay 4

• Example 2

  host1(config-if)#ipv6 ospf transmit-delay 4

• Use the no version to return to the default value, 1 second.
• See ip ospf transmit-delay
• See ipv6 ospf transmit-delay

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