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Configuring RIPng Overview

Devices running ScreenOS 6.3 support static routing and dynamic routing with the Routing Information Protocol next-generation (RIPng), an interior gateway protocol (IGP) that uses a distance-vector algorithm to determine the best route to a destination, using the hop count as the metric. RIPng supports route redistribution to import known routes, from a router running a different protocol, into the current RIPng routing instance. For example, you can import static routes from a virtual router (VR) into a RIPng instance. RIPng is intended only for use in IPv6 networks. You can create RIPng on a per VR basis on a security device. If you have multiple VRs within a system, you can enable multiple instances of RIPng. OSPFv3 like RIPng is a new dynamic routing protocol that works on IPv6 interfaces.

To configure RIPng on a security device:

1. Create the RIPng routing instance in a VR.
2. Enable the RIPng instance.
3. Enable RIPng on interfaces that connect to other RIPng routers.
4. Redistribute routes learned from different routing protocols (such as OSPF, BGP, or statically configured routes) into the RIPng instance.

RIPng Parameters

You can configure some global RIPng parameters at the VR level. When you configure a RIPng parameter at the VR level, the parameter setting affects operations on all RIPng-enabled interfaces. Table 1 describes the RIPng global parameters that you can configure.

Table 1: Global RIPng Parameters and Default Values

RIPng Global Parameter	Description	Default Description Value(s)
Advertising Default Route	Specifies whether the default route (::/0) is advertised.	Disabled
Default Metric	Specifies the default metric value for routes imported into RIPng from other protocols, such as OSPF and BGP.	10
Flush Timer	Specifies, in seconds, when a route is removed from the time the route becomes invalid	120 seconds
Invalid Timer	Specifies, in seconds, when a route becomes invalid from the time a neighbor stops advertising the route.	180 seconds
Maximum Number of Neighbors Allowed on One Interface	Specifies the maximum number of RIPng neighbors allowed.	256
Reject Default Route	Specifies whether RIPng rejects a default route learned from another protocol.	Disabled
Inbound Route Map	Specifies the filter for routes to be learned by RIPng.	None. Select a value from the drop-down list.
Outbound Route Map	Specifies the filter for routes to be advertised by RIPng.	None. Select a value from the drop-down list.
Access List Number To Filter Only Trusted Neighbors	Specifies an access list that defines RIPng neighbors. If no neighbors are specified, the RIPng uses multicasting or broadcasting to detect neighbors on an interface.	None. All neighbors are trusted.
Update Timer	Specifies, in seconds, when to issue updates of RIPng routes to neighbors.	30 seconds

Redistribution Rules

Redistribution rules exchange route information between routing protocols. You need to configure a route map to filter the routes that are redistributed. Routes imported into RIPng from other protocols have a default metric of 10. You can change the default metric.

You can redistribute the following types of rules into the RIPng routing instance in the same VR:

• Routes learned from BGP
• Routes learned from OSPF
• Directly connected routes
• Imported routes
• Statically configured routes