7.1. OSPFv3 Commands

Command Purpose

To specify a cost for the default summary route sent into a stub, use the area default-cost command in router configuration mode.

To remove the assigned default route cost, use the no form of this command.

Prerequisites

Command Syntax

area AREA-ID default-cost COST

no area AREA-ID default-cost

Command Mode

Router Configuration

Default

The cost value is 1 by default.

Usage

The command is used only on an Area Border Router (ABR) attached to a stub.

There are two stub area router configuration commands: the stub and default-cost options of the area command. In all routers and access servers attached to the stub area, the area should be configured as a stub area using the stub option of the area command. Use the default-cost option only on an ABR attached to the stub area. The default-cost option provides the metric for the summary default route generated by the ABR into the stub area.

Examples

The following example assigns a default cost of 20 to stub network 10.0.0.0:

Switch# configure terminal
Switch(config)# router ipv6 ospf 201
Switch(config-router)#area 10.0.0.0 stub
Switch(config-router)#area 10.0.0.0 default-cost 20

Related Commands

None

Command Purpose

To consolidate and summarize routes at an area boundary, use the area range command in router configuration mode.To disable this function, use the no form of this command.

Prerequisites

Command Syntax

area AREA-ID range ADDRESS/PREFIX-LENGTH ( advertise | not-advertise | )

no area AREA-ID range ADDRESS/PREFIX-LENGTH

Command Mode

Router Configuration

Default

This command is disabled by default.

Usage

The area range command is used only with Area Border Routers (ABRs). It is used to consolidate or summarize routes for an area. The result is that a single summary route is advertised to other areas by the ABR. Routing information is condensed at area boundaries. External to the area, a single route is advertised for each address range. This behavior is called route summarization.

Multiple area router configuration commands specifying the range option can be configured. Thus, OSPF can summarize addresses for many different sets of address ranges.

Examples

The following example specifies one summary route to be advertised by the ABR to other areas for all subnets on area 10:

Switch# configure terminal
Switch(config)# router ipv6 ospf 201
Switch(config-router)#area 10 range 2004::1/16

Related Commands

None

Command Purpose

To define an area as a stub area, use the area stub command in router configuration mode.

To disable this function, use the no form of this command.

Prerequisites

Command Syntax

area AREA-ID stub ( no-summary | )

no area AREA-ID stub ( no-summary | )

Command Mode

Router Configuration

Default

No stub area is defined.

Usage

You must configure the area stub command on all routers and access servers in the stub area. Use the area router configuration command with the default-cost keyword to specify the cost of a default internal router sent into a stub area by an ABR.

There are two stub area router configuration commands: the stub and default-cost options of the area router configuration command. In all routers attached to the stub area, the area should be configured as a stub area using the stub keyword of the area command. Use the default-cost keyword only on an ABR attached to the stub area. The default-cost keyword provides the metric for the summary default route generated by the ABR into the stub area.

To further reduce the number of link-state advertisements (LSAs) sent into a stub area, you can configure the no-summary keyword on the ABR to prevent it from sending summary LSAs (LSA type 3) into the stub area.

Examples

The following example assigns a default cost of 20 to stub network 10.0.0.0:

Switch# configure terminal
Switch(config)# router ipv6 ospf 201
Switch(config-router)#area 10.0.0.0 stub
Switch(config-router)#area 10.0.0.0 default-cost 20

Related Commands

None

Command Purpose

To control how Open Shortest Path First Version3 (OSPFv3) calculates default metrics for the interface; use the auto-cost command in router configuration mode.

To assign cost based only on the interface type, use the no form of this command.

Prerequisites

Command Syntax

auto-cost reference-bandwidth RATE

no auto-cost reference-bandwidth

Command Mode

Router Configuration

Default

100 Mbps

Usage

The value set by the ipv6 ospf cost command overrides the cost resulting from the auto-cost command.

Examples

The following example changes the cost of the cost link to 1GBps:

Switch# configure terminal
Switch(config)# router ipv6 ospf 1
Switch(config-router)#auto-cost reference-bandwidth 1000

Related Commands

ipv6 ospf cost

Command Purpose

To clear routing information based on the Open Shortest Path First (OSPF) routing process ID, use the clear ipv6 ospf command in privileged EXEC mode.

Prerequisites

Command Syntax

clear ipv6 ospf ( PID | ) process

Command Mode

Privileged EXEC

Default

None

Usage

Use the PID argument to clear only one OSPFv3 process. If the PID argument is not specified, all OSPFv3 processes are cleared.

Examples

The following example clears all OSPFv3 processes:

Switch# clear ipv6 ospf process

Related Commands

None

Command Purpose

To generate a default external route into an Open Shortest Path First Version3 (OSPFv3) routing domain, use the default-information originate command in router configuration mode.

To disable this feature, use the no form of this command.

Prerequisites

Command Syntax

default-information originate

default-information originate { metric METRIC | metric-type TYPE ) | route-map ROUTE_MAP | always }

no default-information originate

no default-information originate { metric | metric-type | route-map | always }

Command Mode

Router Configuration

Default

This command is disabled by default.

Usage

Whenever you use the redistribute or the default-information router configuration command to redistribute routes into an OSPFv3 routing domain, the switch automatically becomes an autonomous System Boundary Router (ASBR). However, an ASBR does not, by default, generate a default route into the OSPFv3 routing domain. The system still must have a default route for itself before it generates one, except when you have specified the always keyword.

Examples

The following example specifies a metric of 100 for the default route redistributed into the OSPFv3 routing domain and an external metric type of Type 1:

Switch# configure terminal
Switch(config)# router ipv6 ospf 109
Switch(config-router)# redistribute rip metric 100
Switch(config-router)#default-information originate metric 100 metric-type 1

Related Commands

redistribute (OSPFv3)

Command Purpose

To set default metric values for the Open Shortest Path First Version3 (OSPFv3) routing protocol, use the default-metric command in router configuration mode.

To return to the default state, use the no form of this command.

Prerequisites

Command Syntax

default-metric METRIC-VALUE

no default-metric ( METRIC-VALUE )

Command Mode

Router Configuration

Default

1 for BGP routes

20 for others

Usage

The default-metric command is used in conjunction with the redistribute router configuration command to cause the current routing protocol to use the same metric value for all redistributed routes. A default metric helps solve the problem of redistributing routes with incompatible metrics. Whenever metrics do not convert, using a default metric provides a reasonable substitute and enables the redistribution to proceed.

Examples

The following example shows a router in autonomous system using both the Routing Information Protocol (RIPng) and the OSPFv3 routing protocols. The example advertises OSPFv3-derived routes using RIPng and assigns the Internal Gateway Protocol (IGP)-derived routes a RIPng metric of 10:

Switch# configure terminal
Switch(config)# router ipv6 ospf
Switch(config-router)#default-metric 10
Switch(config-router)# redistribute ripng

Related Commands

redistribute (OSPFv3)

Command Purpose

To define Open Shortest Path First Version3 (OSPFv3) route administrative distances based on route type, use the distance command in router configuration mode.

To restore the default value, use the no form of this command.

Prerequisites

Command Syntax

distance { DISTANCE | ospfv3 [ external DIST1 ] [ inter-area DIST2 ] | [ intra-area DIST3 ] }

no distance { DISTANCE | ospfv3 }

Command Mode

Router Configuration

Default

DIST1: 110

DIST2: 110

DIST3: 110

Usage

You may specify one of the keywords or use distance only to apply to all types of routes.

The distance command allows you to set a distance for an entire group of routes, rather than a specific route that passes an access list.

A common reason to use the distance command is when you have multiple OSPFv3 processes with mutual redistribution, and you want to prefer internal routes from one over external routes from the other.

Examples

The following example shows a router in autonomous system using both the Routing Information Protocol (RIPng) and the OSPFv3 routing protocols. The example advertises OSPFv3-derived routes using RIPng and assigns the Internal Gateway Protocol (IGP)-derived routes a RIPng distance of 90:

Switch# configure terminal
Switch(config)# router ipv6 ospf
Switch(config-router)#distance 90
Switch(config-router)# redistribute ripng

Related Commands

None

Command Purpose

To filter networks received in updates or suppress networks from being advertised in updates, use the distribute-list command in router configuration mode.

To cancel this function, use the no form of this command.

Prerequisites

Command Syntax

distribute-list ACCESSS-LIST-NAME ( in | out ( bgp | connected | ospfv3 | ripng | static ) )

no distribute-list ACCESSS-LIST-NAME ( in | out ( bgp | connected | ospfv3 | ripng | static ) )

Command Mode

Router Configuration

Default

This command is disabled by default.

Usage

This command must specify an access list.

Examples

In the following example, OSPFv3 process 1 is configured to accept two prefixes, prefix 2001:1:1::1/32 and prefix 3001:1:1::1/32:

Switch# configure terminal
Switch(config)# ipv6 access-list fiter-as-router
Switch(config-ip-acl)# permit any 2001:1:1::1/32 any
Switch(config-ip-acl)# permit any 3001:1:1::1/32 any
Switch(config-ip-acl)#deny any any any
Switch(config)# router ipv6 ospf 1
Switch(config-router)#distribute-list acl1 in

Related Commands

ipv6 access-list

Command Purpose

Use this command to enable optimize the process when building ospfv3 neighbor ship.

Prerequisites

Command Syntax

enable db-summary-opt

no enable db-summary-opt

Command Mode

Router Configuration

Default

Disable

Usage

After this function enabled, if the router receives a DD packet which has newer LSA, the router should delete the LSA in the database summary list, and should not send this LSA to its neighbor.

Examples

The following example enables this optimization:

Switch# configure terminal
Switch(config)# router ipv6 ospf 1
Switch(config-if)# enable db-summary-opt
Switch# configure terminal
Switch(config)# router ipv6 ospf 1
Switch(config-router)# enable db-summary-opt

Related Commands

None

Command Purpose

To explicitly specify the cost of sending a packet on an interface, use the ipv6 ospf cost command in interface configuration mode. To reset the path cost to the default value, use the no form of this command.

Prerequisites

Command Syntax

ipv6 ospf cost INTERFACE-COST ( instance ID | )

no ipv6 ospf cost ( instance ID | )

Command Mode

Interface Configuration

Default

No default cost is predefined.

Usage

You can set the metric manually using this command, if you need to change the default. Using the bandwidth command changes the link cost as long as this command is not used.

The link-state metric is advertised as the link cost in the router link advertisement.

In general, the path cost is calculated using the following formula:

Reference Bandwidth / bandwidth

Examples

The following example sets the interface cost value to 65:

Switch# configure terminal
Switch(config)# interface eth-0-1
Switch(config-if)# no switchport
Switch(config-if)# ipv6 ospf cost 65

Related Commands

auto-cost reference bandwidth

Command Purpose

To set the interval during which at least one hello packet must be received from a neighbor before the router declares that neighbor down, use the ipv6 ospf dead-interval command in interface configuration mode. To restore the default value, use the no form of this command.

Prerequisites

Command Syntax

ipv6 ospf dead-interval SECONDS ( instance ID | )

no ipv6 ospf dead-interval ( instance ID | )

Command Mode

Interface Configuration

Default

The neighbor is considered as dead in 40s by default.

Usage

The dead interval is advertised in OSPFv3 hello packets. This value must be the same for all networking devices on a specific network.

Specifying a smaller dead interval (seconds) will give faster detection of a neighbor being down and improve convergence, but might cause more routing instability.

Examples

The following example sets the OSPFv3 dead interval to 20 seconds:

Switch# configure terminal
Switch(config)# interface eth-0-1
Switch(config-if)# no switchport
Switch(config-if)# ipv6 ospf dead-interval 20

Related Commands

ipv6 ospf hello-interval

show ipv6s ospf interface

Command Purpose

To specify the interval between hello packets that the switch sends on the interface, use the ip ospf hello-interval command in interface configuration mode.

To return to the default time, use the no form of this command.

Prerequisites

Command Syntax

ip ospf hello-interval SECONDS ( instance ID | )

no ip ospf hello-interval ( instance ID | )

Command Mode

Interface Configuration

Default

10 seconds (Ethernet)

30 seconds (non-broadcast)

Usage

This value is advertised in the hello packets. The smaller the hello interval, the faster topological changes will be detected, but more routing traffic will ensue. This value must be the same for all routers and access servers on a specific network.

Examples

The following example sets the interval between hello packets to 15 seconds:

Switch# configure terminal
Switch(config)# interface eth-0-1
Switch(config-if)# no switchport
Switch(config-if)# ipv6 ospf hello-interval 15

Related Commands

ipv6 ospf dead-interval

Command Purpose

To disable Open Shortest Path First Version3 (OSPFv3) maximum transmission unit (MTU) mismatch detection on receiving Database Descriptor (DBD) packets, use the ipv6 ospf mtu-ignore command in interface configuration mode.

To reset to default, use the no form of this command.

Prerequisites

Command Syntax

ipv6 ospf mtu-ignore ( instance ID | )

no ipv6 ospf mtu-ignore ( instance ID | )

Command Mode

Interface Configuration

Default

OSPFv3 MTU mismatch detection is enabled.

Usage

OSPFv3 checks whether neighbors are using the same MTU on a common interface. This check is performed when neighbors exchange DBD packets. If the receiving MTU in the DBD packet is higher than the IP MTU configured on the incoming interface, OSPFv3 adjacency will not be established.

Examples

The following example disables MTU mismatch detection on receiving DBD packets:

Switch# configure terminal
Switch(config)# interface eth-0-1
Switch(config-if)# no switchport
Switch(config-if)# ipv6 ospf mtu-ignore

Related Commands

None

Command Purpose

To set the router priority, which helps determine the designated router for this network, use the ip ospf priority command in interface configuration mode.

To return to the default value, use the no form of this command.

Prerequisites

Command Syntax

ipv6 ospf priority NUMBER-VALUE ( instance ID | )

no ipv6 ospf priority ( instance ID | )

Command Mode

Interface Configuration

Default

Priority of 1

Usage

When two routers attached to a network both attempt to become the designated router, the one 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 is ineligible to become the designated router or backup designated router. Router priority is configured only for interfaces to multi-access networks (in other words, not to point-to-point networks).

This priority value is used when you configure Open Shortest Path First Version3 (OSPFv3) for non-broadcast networks using the neighbor router configuration command for OSPFv3.

Examples

The following example sets the router priority value to 4:

Switch# configure terminal
Switch(config)# interface eth-0-1
Switch(config-if)# no switchport
Switch(config-if)# ipv6 ospf priority 4

Related Commands

None

Command Purpose

To specify the time between link-state advertisement (LSA) retransmissions for adjacencies belonging to the interface, use the ipv6 ospf retransmit-interval command in interface configuration mode.

To return to the default value, use the no form of this command.

Prerequisites

Command Syntax

ipv6 ospf retransmit-interval SECONDS ( instance ID | )

no ipv6 ospf retransmit-interval ( instance ID | )

Command Mode

Interface Configuration

Default

5 seconds

Usage

When a router sends an LSA to its neighbor, it keeps the LSA until it receives back the acknowledgment message. If the router receives no acknowledgment, it will resend the LSA. The setting of this parameter should be conservative, or needless retransmission will result. The value should be larger for serial lines and virtual links.

Examples

The following example sets the retransmit interval value to 8 seconds:

Switch# configure terminal
Switch(config)# interface eth-0-1
Switch(config-if)# no switchport
Switch(config-if)# ipv6 ospf retransmit-interval 8

Related Commands

None

Command Purpose

To set the estimated time required to send a link-state update packet on the interface, use the ipv6 ospf transmit-delay command in interface configuration mode. To return to the default value, use the no form of this command.

Prerequisites

Command Syntax

ipv6 ospf transmit-delay SECONDS ( instance ID | )

no ipv6 ospf transmit-delay ( instance ID | )

Command Mode

Interface Configuration

Default

1 second

Usage

Link-state advertisements (LSAs) in the update packet must have their ages incremented by the amount specified in the seconds argument before transmission. The value assigned should take into account the transmission and propagation delays for the interface.

If the delay is not added before transmission over a link, the time in which the LSA propagates over the link is not considered. This setting has more significance on very low-speed links.

Examples

The following example sets the retransmit delay value to 3 seconds:

Switch# configure terminal
Switch(config)# interface eth-0-1
Switch(config-if)# no switchport
Switch(config-if)# ipv6 ospf transmit-delay 3

Related Commands

None

Command Purpose

To set network type of the interface, use the ipv6 ospf network command in interface configuration mode. To return to the default value, use the no format of this command.

Prerequisites

Command Syntax

ipv6 ospf network ( broadcast | non-broadcast | point-to-multipoint ( non-broadcast | ) | point-to-point | ) ( instance <0-255> | )

no ipv6 ospf network ( instance <0-255> | )

Command Mode

Interface Configuration

Default

broadcast

Usage

None

Examples

The following example sets the netwok type of interface to point-to-point:

Switch# configure terminal
Switch(config)# interface eth-0-1
Switch(config-if)# no switchport
Switch(config-if)# ipv6 ospf network point-to-point

Related Commands

None

Command Purpose

To configure IPv6 ospf neighbor, use the ipv6 ospf neighbor command in interface configuration mode. To return to the default value, use the no format of this command.

Prerequisites

Command Syntax

ipv6 ospf neighbor ADDRESS ( { poll-interval <1-65535> | priority <0-255> } | ) ( cost <1-65535> | ) ( instance <0-255> | )

no ipv6 ospf neighbor ( instance <0-255> | )

Command Mode

Interface Configuration

Default

No neighbor is configured.

Usage

None

Examples

The following example configure IPv6 ospf neighbor on the interface:

Switch# configure terminal
Switch(config)# interface eth-0-1
Switch(config-if)# no switchport
Switch(config-if)# ipv6 ospf neighbor fe80::1

Related Commands

None

Command Purpose

To disable sending routing updates for the Open Shortest Path First Version3 (OSPFv3) on an interface, use the passive-interface command in router configuration mode. To re-enable the sending of routing updates, use the no form of this command.

Prerequisites

Command Syntax

passive-interface IFNAME

no passive-interface IFNAME

Command Mode

Router Configuration

Default

Routing updates are sent on the interface.

Usage

If you disable the sending of routing updates on an interface, the particular subnet will continue to be advertised to other interfaces, and updates from other switches on that interface continue to be received and processed.

Examples

The following example sets the interface eth-0-1 as passive:

Switch# configure terminal
Switch(config)# router ipv6 ospf 200
Switch(config-router)# passive-interface eth-0-1

Related Commands

router ipv6 ospf

Command Purpose

To redistribute routes from one routing domain into Open Shortest Path First Version3 (OSPFv3) routing domain, use the redistribute command in router configuration mode. To disable redistribution, use the no form of this command.

Prerequisites

Command Syntax

redistribute PROTOCOL [ route-map WORD ] [ tag TAG-VALUE ] [ metric METRIC-VALUE ] [ metric-type TYPE-VALUE ]

no redistribute PROTOCOL [ metric METRIC -VALUE ] [ metric-type TYPE-VALUE ]

Command Mode

Router Configuration

Default

Route redistribution is disabled.

metric metric-value: 20

metric-type TYPE-VALUE: Type 2 external route

Usage

The metric value specified in the redistribute command supersedes the metric value specified using the default-metric command.

Examples

The following example redistribute the static routes into OSPFv3 with metric 10:

Switch# configure terminal
Switch(config)# router ospf 100
Switch(config-router)# redistribute static metric 10

Related Commands

default-metric

Command Purpose

To use a fixed router ID, use the router-id command in router configuration mode.

To force Open Shortest Path First Version3 (OSPFv3) use the previous OSPF router ID behavior, use the no form of this command.

Prerequisites

Command Syntax

router-id IP-ADDRESS

no router-id

Command Mode

Router Configuration

Default

No OSPF routing process is defined.

Usage

You can configure an arbitrary value in the IP address format for each router. However, each router ID must be unique.

If this command is used on an OSPFv3 router process which is already active (has neighbors), the new router-ID is used at the next reload or at a manual OSPFv3 process restart. To manually restart the OSPFv3 process, use the clear ip ospf command.

Examples

The following example specifies a fixed router-id:

Switch# configure terminal
Switch(config)# router ipv6 ospf 119
Switch(config-router)# router-id 10.1.1.1

Related Commands

clear ipv6 ospf

router ipv6 ospf

Command Purpose

To configure an Open Shortest Path First Version3 (OSPFv3) routing process, use the router ipv6 ospf command in Global Config mode. To terminate an OSPFv3s routing process, use the no form of this command.

Prerequisites

Command Syntax

router ipv6 ospf [ PROCESS-ID [ vrf VPN-NAME ] ]

no router ipv6 ospf [ PROCESS-ID ]

Command Mode

Global Config

Default

No OSPF routing process is defined.

Usage

You can specify multiple OSPFv3 routing processes in each router. If you do not specify the process-id, the process-id will be the default 0.

Examples

The following example configures an OSPFv3 routing process and assigns a process number of 109:

Switch# configure terminal
Switch(config)# router ipv6 ospf 109

Related Commands

None

Command Purpose

To create aggregate addresses for Open Shortest Path First Version3 (OSPFv3), use the summary-address command in router configuration mode. To restore the default, use the no form of this command.

Prerequisites