O Commands
This chapter describes the Cisco NX-OS unicast routing commands that begin with the letter O.
object
o specify an object for a tracked list, use the object command. To remove the object from the tracked list, use the no form of this command.
object object-number [ not ] [ weight weight-number ]
Syntax Description
(Optional) Negates the state of an object. Note The not keyword cannot be used in a weight or percentage threshold list. It can only be used in a Boolean list. |
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Defaults
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Usage Guidelines
You can configure an object track list that contains multiple tracked objects. A tracked list contains one or more objects.
The Boolean expression enables two types of calculation by using either “and” or “or” operators.
You can also configure an object track list that contains a percentage threshold.The percentage of up objects must exceed the configured track list up percent threshold before the track list is in an up state. For example, if the tracked list has three objects, and you configure an up threshold of 60%, two of the objects must be in the up state (66% of all objects) for the track list to be in the up state.
You can also configure an object track list that contains a weight threshold. A tracked list contains one or more objects. The combined weight of up objects must exceed the configured track list up weight threshold before the track list is in an up state. For example, if the tracked list has three objects with the default weight of 10 each, and you configure an up threshold of 15, two of the objects must be in the up state (combined weight of 20) for the track list to be in the up state.
Examples
This example shows how to configure a track list with an up weight threshold of 30 and a down threshold of 10:
Related Commands
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ospfv3 authentication ipsec
To enable authentication of OSPFv3 packets for a particular interface, use the ospfv3 authentication ipsec command at the interface level. To disable the authentication of OSPFv3 packets, use the no form of this command.
ospfv3 authentication ipsec spi spi auth [0|3|7] key
no ospfv3 authentication ipsec spi spi
Syntax Descriptionn
Authentication algorithm. Its value can be md1 / sha1 / null. |
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Specifies that the authentication password is 3DES encrypted. |
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Specifies that the authentication password is Cisco type 7 encrypted. |
Defaults
Command Modes
Interface configuration (config-if).
Command History
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Usage Guidelines
Before running this command, ensure that you have enabled the authentication package with the feature imp command.
Examples
The following example shows how to authenticate OSPFv3 packets at the ethernet interface 2/1:
Related Commands
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Enables authentication of the OSPFv3 packets for all interfaces under the area. |
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Enables authentication of the OSPFv3 packets at the router level. |
ospfv3 cost
To specify the cost of sending a packet on an interface, use the ospfv3 cost command. To reset the path cost to the default, use the no form of this command.
Syntax Description
Unsigned integer value expressed as the link-state metric. The range is from 1 to 65535. |
Defaults
Calculates the cost based on the reference bandwidth divided by the configured interface bandwidth. You can configure the reference bandwidth or it defaults to 40 Gb/s.
Command Modes
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Usage Guidelines
Use the ospfv3 cost command to configure the cost metric manually for each interface. This command overrides any settings for the reference bandwidth that you set using the auto-cost command in router configuration mode.
If this command is not used, the link cost is calculated using the following formula:
Examples
This example shows how to configure the interface cost value to 65:
switch(config)# interface ethernet 1/2
switch(config-if)# ospfv3 cost 65
Related Commands
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Specifies the reference bandwidth that OSPFv3 uses to calculate the link cost. |
ospfv3 dead-interval
To set the interval during which at least one hello packet must be received from a neighbor before the router declares that neighbor as down, use the ospfv3 dead-interval command. To restore the default, use the no form of this command.
Syntax Description
Defaults
The default for seconds is four times the interval set by the ospfv3 hello-interval command.
Command Modes
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Usage Guidelines
Use the ospfv3 dead-interval command to set the dead interval that OSPFv3 advertises in hello packets. This value must be the same for all networking devices on a specific network.
Configure a shorter dead interval to detect down neighbors faster and improve convergence. Very short dead intervals could cause routing instability.
Use the show ospfv3 interface command to verify the dead interval and hello interval.
Examples
This example shows how to set the OSPFv3 dead interval to 20 seconds:
Related Commands
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Interval between hello packets that OSPFv3 sends on the interface. |
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ospfv3 hello-interval
To specify the interval between hello packets that Open Shortest Path First version 3 (OSPFv3) sends on the interface, use the ospfv3 hello-interval command. To return to the default, use the no form of this command.
Syntax Description
Specifies the interval (in seconds). The value must be the same for all nodes on a specific network. The range is from 1 to 65535. |
Defaults
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Usage Guidelines
Use the ospfv3 hello-interva l command to set the rate at which OSPFv3 advertises hello packets. Shorter hello intervals allow OSPFv3 to detect topological changes faster. This value must be the same for all routers and access servers on a specific network.
Examples
This example shows how to set the interval between hello packets to 15 seconds:
Related Commands
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Sets the time period for which hello packets must not have been seen before neighbors declare the router as down. |
ospfv3 mtu-ignore
To disable Open Shortest Path First version 3 (OSPFv3) maximum transmission unit (MTU) mismatch detection on received Database Descriptor (DBD) packets, use the ospfv3 mtu-ignore command. To return to the default, use the no form of this command.
Syntax Description
Defaults
Command Modes
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Usage Guidelines
Use the ospfv3 mtu-ignore command to disable MTU mismatch detection on an interface. By default, OSPFv3 checks whether neighbors are using the same MTU on a common interface. If the receiving MTU is higher than the IP MTU configured on the incoming interface, OSPFv3 does not establish adjacencies. Use the ospfv3 mtu-ignore command to disable this check and allow adjacencies when the MTU value differs between OSPFv3 neighbors.
Examples
This example shows how to disable MTU mismatch detection on received DBD packets:
ospfv3 network
To configure the Open Shortest Path First version 3 (OSPFv3) network type to a type other than the default for an interface, use the ospfv3 network command. To return to the default, use the no form of this command.
ospfv3 network { broadcast | point-to-point }
Syntax Description
Defaults
Command Modes
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Usage Guidelines
The network type influences the behavior of the OSPF interface. OSPF network type is usually broadcast, which uses OSPF multicasting capabilities. Under this network type a designated router and backup designated router are elected. For point-to-point networks there are only two neighbors and multicast is not required. For routers on an interface to become neighbors the network type for all should match.
Examples
This example shows how to set an OSPFv3 network as a broadcast network:
ospfv3 passive-interface
To suppress Open Shortest Path First version 3 (OSPFv3) routing updates on an interface, use the ospfv3 passive-interface command. To return to the default, use the no form of this command.
Syntax Description
Defaults
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Usage Guidelines
If an interface is configured as passive-interface it does not participate in the OSPF protocol and will not establish adjacencies or send routing updates. However the interface is announced as part of the routing network.
Examples
This example shows how to set an interface as passive:
ospfv3 priority
To set the router priority for an Open Shortest Path First version 3 (osPFv3) interface, use the ospfv3 priority command. To return to the default, use the no form of this command.
no ospfv3 priority number-value
Syntax Description
Number value that specifies the priority of the router. The range is from 0 to 255. |
Defaults
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Usage Guidelines
Use the ospfv3 priority command to set the router priority, which determines the designated router for this network. When two routers are attached to a network, both attempt to become the designated router. The router with the higher router priority takes precedence. If there is a tie, the router with the higher router ID takes precedence. A router with a router priority set to zero cannot become the designated router or backup designated router.
Examples
This example shows how to set the router priority value to 4:
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Configures the OSPFv3 network type to a type other than the default for a given medium. |
ospfv3 retransmit-interval
To specify the time between Open Shortest Path First version 3 (OSPFv3) link-state advertisement (LSA) retransmissions for adjacencies belonging to the interface, use the ospfv3 retransmit-interval command. To return to the default, use the no form of this command.
ospfv3 retransmit-interval seconds
Syntax Description
Defaults
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Usage Guidelines
Use the ospfv3 retransmit-interval command to set the time between LSA retransmissions. When a router sends an LSA to its neighbor, it keeps the LSA until it receives an acknowledgment message from the neighbor. If the router receives no acknowledgment within the retransmit interval, the local router resends the LSA.
Examples
This example shows how to set the retransmit interval value to 8 seconds:
ospfv3 shutdown
To shut down an Open Shortest Path First version 3 (osPFv3) interface, use the ospfv3 shutdown command. To return to the default, use the no form of this command.
Syntax Description
Defaults
Command Modes
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Usage Guidelines
Use the ospfv3 shutdown command to shut down OSPFv3 on this interface.
Examples
This example shows how to shut down OSPFv3 on an interface:
ospfv3 transmit-delay
To set the estimated time required to send an Open Shortest Path First version 3 (OSPFv3) link-state update packet on the interface, use the ospfv3 transmit-delay command. To return to the default, use the no form of this command.
Syntax Description
Time (in seconds) required to send a link-state update. The range is from 1 to 450 seconds. |
Defaults
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Usage Guidelines
Use the ospfv3 transmit-delay command to set the estimated time needed to send an LSA update packet. OSPFv3 increments the LSA age time by transmit delay amount before transmitting the LSA update. You should take into account the transmission and propagation delays for the interface when you set this value.
Examples
This example shows how to set the transmit delay value to 8 seconds:
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