Cisco Systems, Inc.

7025 Kit Creek Rd. Research Triangle Park NC 27709 USA aretana@cisco.com

Huawei Technologies

2330 Central Expressway Santa Clara California 95050 USA dean.cheng@huawei.com

This document modifies the "Unassigned" number space in the IANA "OSPFv3 Instance ID Address Family Values" registry by dividing it in two halves -- one half Unassigned but managed via Standards Action, and the other Reserved for Private Use. It updates RFC 5838.

defined the "OSPFv3 Instance ID Address Family Values" registry for the purpose of mapping OSPFv3 Instance IDs to different address families. The following table lists the value ranges that were allocated for and Unassigned. Value Description Reference 0 IPv6 unicast AF 1 - 31 Base IPv6 Unicast AF dependent on local policy 32 Base IPv6 Multicast 33-63 IPv6 Multicast AFs dependent on local policy 64 Base IPv4 Unicast AF 65-95 IPv4 Unicast AFs dependent on local policy 96 Base IPv4 Multicast 97-127 IPv4 Multicast AFs dependent on local policy 128-255 Unassigned In some networks, additional OSPFv3 instances may be required to operationally identify specific applications. This need requires a pool of Instance IDs that the operator may locally assign for that purpose. For example, describes an application in which IPv4-embedded IPv6 addresses are used to transport IPv4 packets over an IPv6 network. While the IPv4-embedded IPv6 addresses do in fact represent IPv6 destinations, it would be operationally beneficial to be able to easily identify the specific application by having a separate space to do so. This benefit is enabled by the allocation of a range of Private Use Instance IDs. This document modifies the IANA "OSPFv3 Instance ID Address Family Values" registry by designating a range as Reserved for Private Use. For the remaining unassigned values, the registration procedure is Standards Action.

The IANA "OSPFv3 Instance ID Address Family Values" registry has been updated so that Instance IDs from 192-255 are Reserved for Private Use . For the remaining unassigned values (128-191), the registration procedure is Standards Action. The registry now shows: Value Description Reference 128-191 Unassigned 192-255 Reserved for Private Use this document Private Use

This document requests the modification of the "OSPFv3 Instance ID Address Family Values" registry as described in . The reference to has been removed from the registry for the modified ranges.

This document modifies an IANA registry defined in . It does not introduce any new security issues.

Many thanks to Acee Lindem, Stewart Bryant, Nevil Brownlee, Pearl Liang, Ben Campbell, Adrian Farrel, and Richard Barnes for their review and input.

This document describes a routing scenario where IPv4 packets are transported over an IPv6 network, based on RFCs 6145 and 6052, along with a separate OSPFv3 routing table for IPv4-embedded IPv6 routes in the IPv6 network.