Default OSPF Parameters lists OSPF parameters and their default values.
Default OSPF Parameters
| Parameter | Description | Default Value |
|---|---|---|
| router ID | Provides for the identification of one router to another and helps establish adjacencies among OSPF routers. | highest IP address of configured routing interfaces |
| interface cost | An outbound interface value used in determining which routing interface should forward when more than one routing interface is available. | 10 |
| interface priority | A value placed on the interface that helps in determining which router will be elected designated router. | 1 |
| interface network type | Specifies the type of network an interface is connecting to. | broadcast |
| LSA Thresholds | Specifies:
|
4294967295 Update starts 4294967295 Update restarts 50 Inter-area/external updates 0 Intra updates |
| LSA Pause Frequency | Specifies the number of units SPF calculation runs before pausing. | 10000 |
| SPF delay timer | Specifies the amount of time between receiving an OSPF update and the start of an SPF calculation. | 5 seconds |
| retransmit interval | A timer that determines the retransmission of LSAs in order to ensure reliable flooding. | 5 seconds |
| transmit delay | Specifies the number of seconds it takes to transmit a link state update packet over this interface. | 1 second |
| hello interval | The period between transmissions of hello packet advertisements. | 10 seconds for broadcast and point-to-point networks; 30 seconds for non-broadcast and point-to-multipoint networks |
| dead interval | The period that can elapse without receiving a router‘s hello packets before its neighbors will declare it down. | 40 seconds |
| distance | Specifies the administrative distance for OSPF routes. The available protocol with the lowest administrative distance is chosen for this route. | connected = 0 static = 1 OSPF = 110 RIP = 120 |
| graceful-restart | Provides for an OSPF router to remain on the forwarding path during a restart of its OSPF software. | disabled |
| graceful-restart restart interval | Specifies the maximum time in seconds after which the graceful restart will terminate should it not complete or terminate for other reasons within the interval. | 120 seconds |
| PE-CE Protocol | Enables the Customer Edge (CE) router as a Provider Edge (PE) router peers. | disabled |
Configuring Basic OSPF Parameters describes how to configure basic OSPF parameters. All commands in this procedure are entered in OSPF router configuration command mode, except where indicated.
Configuring Basic OSPF Parameters
| Step | Task | Command(s) |
|---|---|---|
| 1 | Configure an IP address for all routing interfaces in the AS.
|
ip address {ip-address | ip-address/prefixLength} ip-mask [primary | secondary] |
| 2 | Create an OSPF routing instance. | router ospf process-id |
| 3 | Configure the network addresses, masks, and areas for each subnet on this AS.
|
network ip-address wildcard-mask area area-id |
Configuring OSPF General Optional Parameters describes how to configure basic OSPF parameters.
Configuring OSPF General Optional Parameters
| Task | Command(s) |
|---|---|
| Optionally, change the OSPF router ID for this device. | router-id ip-address |
| Optionally, enable the OSPF PE-CE protocol. | enable-pe-ce |
| Optionally, configure the OSPF VRF domain tag. | domain-tag tag |
| Optionally, configure the OSPF VRF domain ID. | domain-id [secondary] type type value value |
| Optionally, configure the OSPF router neighbors for this router. | neighbor ip-address [priority priority] |
| Optionally, change the SPF LSA thresholds for this router. | spf lsa-thresholds num-start num-restart num-intra-full num-ia-ext-full |
| Optionally, change the SPF pause frequency to specify the number of units SPF calculation runs before pausing. | spf pause-frequency units |
| Optionally, change the delay, in milliseconds, between the receipt of an update and the beginning of the SPF execution. | timers spf spf-delay |
| Optionally, enable BFD on all OSPF interfaces (S-, K-Series). | bfd all-intfs-on |
| Optionally, change the administrative distance for OSPF routes. | distance [ospf {external | intra-area}] weight |
| Optionally, define the range of addresses used by this Area Border Router (ABR) when communicating routes to other areas. | area area-id range ip-address ip-mask [not-advertised] |
| Optionally, configure an area as a stub area. | area area-id stub [no-summary] |
| Optionally, set the cost for the default route that is sent into a stub area by an ABR. | area area-id default-cost cost |
| Optionally, configure an area as a not so stubby area. | area {area-id | ip-address} nssa [no-summary] [transstabilityint seconds] [transrole always] |
| Optionally, configure an Autonomous System Border Router (ASBR) to summarize Type 7 to Type 5 routes matching the specified address and mask. | area {area-id | ip-address} nssa-range ip-address mask |
| Optionally, configure an OSPF sham link between two PE routers. | area area-id sham-link source-ip-address destination-ip-address |
| Optionally, configure an OSPF sham link authentication key password. | area area-id sham-link source-ip-address destination-ip-address authentication-key password |
| Optionally, modify the OSPF sham link dead interval. | area area-id sham-link source-ip-address destination-ip-address dead-interval seconds |
| Optionally, modify the OSPF sham link hello interval. | area area-id sham-link source-ip-address destination-ip-address hello-interval seconds |
| Optionally, configure the OSPF sham link keychain. | area area-id sham-link source-ip-address destination-ip-address keychain name |
| Optionally, specify an OSPF sham link message digest key and MD5 authentication key. | area area-id sham-link source-ip-address destination-ip-address message-digest-key digest-key md5 auth-key |
| Optionally, modify the OSPF sham link retransmit interval. | area area-id sham-link source-ip-address destination-ip-address retransmit-interval seconds |
| Optionally, modify the OSPF sham link transmit delay period. | area area-id sham-link source-ip-address destination-ip-address transmit-delay seconds |
| Optionally, modify the OSPF sham link cost. | area area-id sham-link source-ip-address destination-ip-address cost cost |
| Optionally, configure an OSPF virtual-link, which represents a logical connection between the backbone and a non-backbone OSPF area. | area area-id virtual-link ip-address area area-id virtual-link ip-address authentication-key key area area-id virtual-link ip-address dead-interval seconds area area-id virtual-link ip-address hello-interval seconds |
| area area-id virtual-link ip-address message-digest-key digest-key md5 format line auth-key area area-id virtual-link ip-address retransmit-interval seconds area area-id virtual-link ip-address transmit-delay seconds |
|
| Optionally, change the bandwidth reference setting used for calculating interface cost for this OSPF instance. | auto-cost reference-bandwidth bandwidth-multiplier |
| Optionally, enable passive OSPF on the specified interface. | passive-interface {vlan-id | interface-name | default} |
| Optionally, allow routing information discovered through non-OSPF protocols to be distributed in OSPF update messages. | redistribute {rip | static | connected} [route-map id-number] [metric metric value] [metric-type type-value] [tag tag] |
| Optionally, assign an OSPF route filter route-map to the OSPF distribute-list. | distribute-list route-map name in |
| Optionally, enable the graceful-restart feature on this router. | graceful-restart enable |
| Optionally, change the graceful-restart restart interval for this router. | graceful-restart restart-interval interval |
| Optionally, in system command mode, reset the specified OSPF process ID or the OSPF process. | clear ip ospf process [process-id] |
| Optionally, in global configuration command mode, enable OSPF protocol debugging output for the specified subsystem. | debug ip ospf {subsystem} |
| Optionally, enable this OSPF router for RFC 1583 compatibility. | rfc1583compatible |
Configuring OSPF Optional Interface Parameters describes how to configure optional OSPF interface parameters. All commands in this procedure are entered in interface configuration command mode.
Configuring OSPF Optional Interface Parameters
| Step | Task | Command(s) |
|---|---|---|
| 1 | Optionally, change the cost of sending an OSPF packet on this router interface. This setting overrides all other interface cost methods. | ip ospf cost cost |
| 2 | Optionally, sum the interface speeds contained in the specified tracked object when calculating the OSPF interface cost. | ip ospf cost track trackobject-name |
| 3 | Optionally, change the OSPF priority value for this router interface. | ip ospf priority number |
| 4 | Optionally, change the OSPF poll-interval value for this non-broadcast neighbor. | ip ospf poll-interval seconds |
| 5 | Optionally, change the amount of time between retransmissions of LSAs for adjacencies that belong to this interface. | ip ospf retransmit-interval seconds |
| 6 | Optionally, change the amount of time required to transmit a link state update packet on this interface. | ip ospf transmit-delay seconds |
| 7 | Optionally, enable the ignore MTU advertisement feature for the neighbor of this interface. | ip ospf ignore-mtu |
| 8 | Optionally, change the number of seconds this router must wait before sending a hello packet to neighbor routers on this interface. | ip ospf hello-interval seconds |
| 9 | Optionally, change the number of seconds this router must wait to receive a hello packet from its neighbor before determining that the neighbor is out of service. | ip ospf dead-interval {seconds | minimal hello-multiplier number} |
| 10 | Optionally, assign a password on this interface to be used by neighboring routers using OSPF‘s simple password authentication. | ip ospf authentication-key password |
| 11 | Optionally, enable OSPF MD5 authentication on this interface. | ip ospf message-digest-key keyid md5 key |
| 12 | Optionally, disable the graceful restart helper feature on this interface. | ip ospf helper-disable |
| 13 | Optionally, specify the network type that this interface is connected to. | ip ospf network {non-broadcast | broadcast | point-to-point | point-to-multipoint} |
Displaying OSPF Configuration and Statistics describes how to display OSPF configuration and statistics.
Displaying OSPF Configuration and Statistics
| Task | Command(s) |
|---|---|
| Displaying OSPF configuration. | show ip ospf |
| Displaying OSPF link state database information. | show ip ospf database [link-state-id] |
| Displaying information about OSPF internal entries to area border routers and autonomous system boundary routers. | show ip ospf border-routers |
| Displaying OSPF interface configuration information. | show ip ospf interface [vlan vlan-id] |
| Displaying OSPF neighbor information. | show ip ospf neighbor [detail] [ip-address] [vlan vlan-id] |
| Displaying OSPFv3 sham link information. | show ipv6 ospf sham-link |
| Displaying OSPF virtual-links configuration information. | show ip ospf virtual-links |
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