in org.opendaylight.protocol.bgp.rib.impl.BGPPeer constructor

peer name(String) is used as following

super(rib.getInstanceIdentifier(), null, new IpAddress(new Ipv4Address(name)), afiSafisAdvertized,afiSafisGracefulAdvertized);

When used in in org.opendaylight.protocol.bgp.rib.impl.config.BGPPeer

this.bgpPeer = new BGPPeer(Ipv4Util.toStringIP(this.neighborAddress), rib,
OpenConfigMappingUtil.toPeerRole(neighbor), getSimpleRoutingPolicy(neighbor),
BgpPeer.this.rpcRegistry, afiSafisAdvertized, Collections.emptySet());

Where this.neighorAddress is defined as following

private final IpAddress neighborAddress;

which is equal to how it is represented in model.

Therefore its not possible right now to create V6 peer, because if v6 address is provided as neghbors address, it will fail at v4 regex that will be used by

new IpAddress(new Ipv4Address(name)

This problem was introduced by patch https://git.opendaylight.org/gerrit/#/c/49933/12/bgp/rib-impl/src/main/java/org/opendaylight/protocol/bgp/rib/impl/BGPPeer.java

Affects nitrogen and carbon.SR2 also