Juniper JUNOSE, Configuration Manual

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Use to configure the router or VRF to exchange IPv4 or IPv6 addresses by creating
the specified address family.
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IPv4 and IPv6 addresses can be exchanged in unicast, multicast, or VPN mode.
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The default setting is to exchange IPv4 addresses in unicast mode from the
default router.
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Creating an address family for a VRF automatically disables both synchronization
and automatic summarization for that VRF.
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This command takes effect immediately.
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Examples
host1:vr1(config-router)# address-family ipv4 multicast
host1:vr1(config-router)# address-family ipv4 unicast
host1:vr1(config-router)# address-family ipv4 unicast vrf vr2
host1:vr1(config-router)# address-family vpvn4 unicast
host1:vr1(config-router)# address-family vpnv6 unicast ecmplabel
host1:vr1(config-router)# address-family ipv6 multicast
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Use the no version to disable the exchange of a type of prefix.
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See address-family.
Intra-AS IPv6 VPNs
In Figure 76 on page 390, a service provider is offering IPv6 VPN service over an
MPLS-enabled IPv4 backbone. The base MPLS tunnels are established in the IPv4
core network with either of the MPLS signaling protocols (LDP or RSVP). The ingress
PE router pushes the LSP tunnel label directly onto the label stack of the labeled IPv6
VPN packet. The topmost label imposed corresponds to the LSP that runs from the
ingress PE router to the egress PE router. The BGP next-hop field identifies the egress
PE router, and therefore the topmost label to be pushed on the stack. The bottom
label is the label bound to the IPv6 VPN prefix by means of BGP.
The CE devices can attach to the VRFs on the PE routers using both an IPv6 link and
an IPv4 link. In Figure 76 on page 390, the CE devices attach to the VRFs over an IPv4
link, and use MP-BGP to connect to the VRFs on the PE routers. This arrangement
enables the PE routers to learn IPv6 routes from MP-BGP running over TCPv4 from
the CE devices. You can also configure IPv6 static routes in the VRFs on the PE routers
to reach the networks through the CE IPv6 link. Alternatively, you can configure the
static routes with any routing protocol that supports IPv6, such as OSPFv3.
Intra-AS IPv6 VPNs
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Chapter 5: Configuring BGP-MPLS Applications