Cisco Nexus 7000 Series Unicast Routing Command Reference
O Commands
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Table of Contents

O Commands

object

ospfv3 cost

ospfv3 dead-interval

ospfv3 hello-interval

ospfv3 mtu-ignore

ospfv3 network

ospfv3 passive-interface

ospfv3 priority

ospfv3 retransmit-interval

ospfv3 shutdown

ospfv3 transmit-delay

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 ]

no object object-number

 
Syntax Description

not

(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.

weight weight-number

(Optional) Specifies a threshold weight for each object.

 
Defaults

None

 
Command Modes

tracking configuration

 
Supported User Roles

network-admin
vdc-admin

 
Command History

Release
Modification

4.2(1)

This command was introduced.

 
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.

This command does not require a license.

Examples

This example shows how to configure a track list with an up weight threshold of 30 and a down threshold of 10:

switch(config)# track 1 list threshold weight
switch(config-track)# threshold weight up 30 down 10
switch(config-track)# object 10 weight 15
switch(config-track)# object 20 weight 15
switch(config-track)# object 30

 
Related Commands

Command
Description

track list

Configures a track list for object tracking.

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.

ospfv3 cost interface-cost

no ospfv3 cost interface-cost

 
Syntax Description

interface-cost

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

Interface configuration

 
Supported User Roles

network-admin
vdc-admin

 
Command History

Release
Modification

4.0(1)

This command was introduced.

 
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:

link cost = reference bandwidth / interface bandwidth

This command requires the Enterprise Services license.

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

Command
Description

auto-cost (OSPFv3)

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.

ospfv3 dead-interval seconds

no ospfv3 dead-interval

 
Syntax Description

seconds

Interval (in seconds) during which the router must receive at least one hello packet from a neighbor or that neighbor adjacency is removed from the local router and does not participate in routing. The range is from 1 to 65535. The value must be the same for all nodes on the network.

 
Defaults

The default for seconds is four times the interval set by the ospfv3 hello-interval command.

 
Command Modes

Interface configuration

 
Supported User Roles

network-admin
vdc-admin

 
Command History

Release
Modification

4.0(1)

This command was introduced.

 
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.

This command requires the Enterprise Services license.

Examples

This example shows how to set the OSPFv3 dead interval to 20 seconds:

switch(config)# interface ethernet 1/2
switch(config-if)# ospfv3 dead-interval 20
 

 
Related Commands

Command
Description

ospfv3 hello-interval

Interval between hello packets that OSPFv3 sends on the interface.

show ospfv3 interface

Displays OSPFv3-related information.

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.

ospfv3 hello-interval seconds

no ospfv3 hello-interval

 
Syntax Description

seconds

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

10 seconds

 
Command Modes

Interface configuration

 
Supported User Roles

network-admin
vdc-admin

 
Command History

Release
Modification

4.0(1)

This command was introduced.

 
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.

This command requires the Enterprise Services license.

Examples

This example shows how to set the interval between hello packets to 15 seconds:

switch(config)# interface ethernet 1/2
switch(config-if)# ospfv3 hello-interval 15

 
Related Commands

Command
Description

ospfv3 dead-interval

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.

ospfv3 mtu-ignore

no ospfv3 mtu-ignore

 
Syntax Description

This command has no arguments or keywords.

 
Defaults

OSPFv3 MTU mismatch detection is enabled.

 
Command Modes

Interface configuration

 
Supported User Roles

network-admin
vdc-admin

 
Command History

Release
Modification

4.0(1)

This command was introduced.

 
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.

This command requires the Enterprise Services license.

Examples

This example shows how to disable MTU mismatch detection on received DBD packets:

switch(config)# interface ethernet 1/2
switch(config-if)# ospfv3 mtu-ignore

 

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 }

no ospfv3 network

 
Syntax Description

broadcast

Sets the network type as broadcast.

point-to-point

Sets the network type as point-to-point.

 
Defaults

Depends on the network type.

 
Command Modes

Interface configuration

 
Supported User Roles

network-admin
vdc-admin

 
Command History

Release
Modification

4.0(1)

This command was introduced.

 
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.

This command requires the Enterprise Services license.

Examples

This example shows how to set an OSPFv3 network as a broadcast network:

switch(config)# interface ethernet 1/2
switch(config-if)# ipv6 address 2001:0DB8::1/8
switch(config-if)# ospfv3 network broadcast

 

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.

ospfv3 passive-interface

no ospfv3 passive-interface

 
Syntax Description

This command has no keywords or arguments.

 
Defaults

Disabled

 
Command Modes

Interface configuration

 
Supported User Roles

network-admin
vdc-admin

 
Command History

Release
Modification

4.0(1)

This command was introduced.

 
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.

This command requires the Enterprise Services license.

Examples

This example shows how to set an interface as passive:

switch(config)# interface ethernet 1/2
switch(config-if)# ospfv3 passive-interface

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.

ospfv3 priority number-value

no ospfv3 priority number-value

 
Syntax Description

number-value

Number value that specifies the priority of the router. The range is from 0 to 255.

 
Defaults

Priority of 1

 
Command Modes

Interface configuration

 
Supported User Roles

network-admin
vdc-admin

 
Command History

Release
Modification

4.0(1)

This command was introduced.

 
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.

This command requires the Enterprise Services license.

Examples

This example shows how to set the router priority value to 4:

switch(config)# interface ethernet 1/2
switch(config-if)# ospfv3 priority 4

 
Related Commands

Command
Description

ospfv3 network

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

no ospfv3 retransmit-interval

 
Syntax Description

seconds

Time (in seconds) between retransmissions. The time must be greater than the expected round-trip delay between any two routers on the attached network. The range is from 1 to 65535 seconds. The default is 5 seconds.

 
Defaults

5 seconds

 
Command Modes

Interface configuration

 
Supported User Roles

network-admin
vdc-admin

 
Command History

Release
Modification

4.0(1)

This command was introduced.

 
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.

This command requires the Enterprise Services license.

Examples

This example shows how to set the retransmit interval value to 8 seconds:

switch(config)# interface ethernet 1/2
switch(config-if)# ospfv3 retransmit-interval 8

 

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.

ospfv3 shutdown

no ospfv3 shutdown

 
Syntax Description

This command has no keywords or arguments.

 
Defaults

None

 
Command Modes

Interface configuration

 
Supported User Roles

network-admin
vdc-admin

 
Command History

Release
Modification

4.0(1)

This command was introduced.

 
Usage Guidelines

Use the ospfv3 shutdown command to shut down OSPFv3 on this interface.

This command requires the Enterprise Services license.

Examples

This example shows how to shut down OSPFv3 on an interface:

switch(config)# interface ethernet 1/2
switch(config-if)# ospfv3 shutdown

 

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.

ospfv3 transmit-delay seconds

no ospfv3 transmit-delay

 
Syntax Description

seconds

Time (in seconds) required to send a link-state update. The range is from 1 to 450 seconds.

 
Defaults

1 second

 
Command Modes

Interface configuration

 
Supported User Roles

network-admin
vdc-admin

 
Command History

Release
Modification

4.0(1)

This command was introduced.

 
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.

This command requires the Enterprise Services license.

Examples

This example shows how to set the transmit delay value to 8 seconds:

switch(config)# interface ethernet 1/2
switch(config-if)# ospfv3 transmit-delay 8