Juniper JUNOSE, Configuration Manual

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There is no no version.
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See exit-address-family.
neighbor activate
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Use to specify neighbors to exchange routes with from within the current address
family.
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Takes effect immediately.
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If dynamic capability negotiation was not negotiated with the peer, the session
is automatically bounced so that the exchanged address families can be
renegotiated in the open messages when the session comes back up.
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If dynamic capability negotiation was negotiated with the peer, BGP sends a
capability message to the peer to advertise or withdraw the multiprotocol
capability for the address family in which this command is issued.
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If a neighbor is activated, BGP also sends the full contents of the BGP routing
table of the newly activated address family.
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Example
host1:vr1(config-router-af)# neighbor 192.168.1.158 activate
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Use the no version to indicate that routes of the current address family should
not be exchanged with the peer. Use the default version to remove the explicit
configuration from the peer or peer group and reestablish inheritance of the
feature configuration.
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See neighbor activate.
Configuring PE-to-CE BGP Sessions
If you have established a BGP session between a PE and a particular CE router, you
can configure BGP sessions with all the other customer sites within the VPN so that
they can learn the routes to the particular CE router.
Configuring the PE-to-CE external BGP session is a bit different from the usual external
BGP session. You must configure the session in the context of the IPV4 unicast address
family of the VRF. Consider the topology shown in Figure 95 on page 438.
Figure 95: PE-to-CE Session
438 ■
Configuring BGP VPN Services
JUNOSe 11.0.x BGP and MPLS Configuration Guide