OSPF6 Tab Configuration

The options on this page configure the general behavior of OSPF6 in FRR, including various default values used when more specific options are not available.


When creating an initial OSPF6 configuration, configure the interfaces to be used with OSPF6 first. The interface configuration must exist before these general OSPF6 settings can be saved.

General Options


Master enable switch for OSPF6 routing. When checked, FRR will start the OSPF6 routing daemon and attempt to use the OSPF6 settings in this section.

Log Adjacency Changes

When set, instructs the OSPF6 daemon to log changes in neighbor adjacencies. This is useful for tracking changes to neighbor relationships, especially during initial configuration.

Router ID

Typically the highest numbered local IPv4 address on the firewall. This is also frequently set as the internal or LAN side IPv4 address of a router. It does not matter what this ID is, so long as it is given in IPv4 address notation and does not conflict with any neighbors.


Even though OSPF6 handles IPv6 routing, router IDs are specified using IPv4 addresses in dotted quad notation.

SPF Hold Time

SPF timers determine when the router will make SPF routing decisions. Lowest time allowed between SPF calculations. Specified in milliseconds from 0-600000, with a default value of 1000.

The maximum time is calculated as 10x this value.

SPF calculations are adaptive, and if a new event occurs which would otherwise trigger a calculation before the hold timer expires, then the hold is increased by the SPF Hold Time value, up to the maximum. This avoids excessive consecutive recalculations.

SPF Delay

Controls timers that determine when the router will make SPF routing decisions. Minimum time after an event occurs before allowing SPF calculation. Lower values will react faster to changes, but can be less stable. Specified in milliseconds from 0-600000, with a default value of 200.


Enable SNMP AgentX

Enable agentx support for accessing FRR OSPF6 data via SNMP with the net-snmp package.

Default Area

Default Area

Default OSPF area for this instance of OSPF6. Used when an area is required but not defined elsewhere. See OSPF6 Area Configuration for details.

Default Area Type

Sets the type for the Default Area. See Area Types and OSPF6 Area Configuration for details.

Route Distribution

The Distribute Ranges entries instruct OSPF to associate specific IPv6 prefixes with a given OSPF6 area and to advertise them to neighbors. Additional entries can be created by the fa-plus Add button.


In most cases these entries are not necessary to add manually, as interface entries will add appropriate statements to distribute interface subnets as needed.

Subnet to Route

The IPv6 prefix to advertise.

Area ID

The area with which to associate the prefix.


The cost associated with the prefix.

Route Redistribution

This section controls which, if any, IPv6 routes are redistributed to OSPF6 neighbors from other sources (Dynamic Routing Protocol Lists). OSPF6 can redistribute IPv6 routes from connected networks, kernel routes, BGP, and FRR static routes.


Enables redistribution of routes from the given source.

Route Map

Apply the given route map to the redistributed route advertisements.

Route Filtering

Export List

Uses the given ACL to limit Type 3 summary LSA messages for intra-area paths that would otherwise be advertised.

Import List

Similar to export-list, but for routes announced by other routers into this area.

Filter List (Out|In)

Similar to Export List and Import List but uses prefix lists instead of ACLs, and can work in either direction.


Reference Bandwidth

A base value, in Mbit/s, which is used when OSPF6 automatically calculates cost values. The default value is 100 which means that an interface with 100Mbit/s of bandwidth or greater will have a cost of 1, with lower bandwidth values incurring higher cost values.

All routers in the same area should use the same value, otherwise automatic cost calculations would fail to accurately represent total path costs between routers.


Sets an administrative distance for routes obtained via OSPF6. This can be configured globally as well as for specific types of OSPF6 routes.

External Distance

Sets the administrative distance for external OSPF6 routes.

Inter-area Distance

Sets the administrative distance for OSPF6 routes between areas.

Intra-area Distance

Sets the administrative distance for OSPF6 routes inside an area.