bgp default ipv4-unicast
• Use to configure all neighbors to exchange addresses in the IPv4 unicast address family.
• All neighbors must be activated with the neighbor activate command in the IPv4
address family.
• Example
host1:vr1(config-router)#bgp default ipv4-unicast
• Affects only neighbors created after you issue the command. To affect existing
neighbors created before you issued the command, you must use the neighbor activate
command in the context of the IPv4 unicast address family.
• Use the no version to disable the exchange of IPv4 addresses on all neighbors.
• See bgp default ipv4-unicast.
exit-address-family
• Use to exit Address Family Configuration mode and access Router Configuration mode.
• Example
host1:vr1(config-router-af)#exit-address-family
• There is no no version.
• See exit-address-family.
neighbor activate
• Use to specify a peer or peer group with which routes of the current address family are
exchanged.
• A peer or peer group can be activated in more than one address family. By default, a
peer is activated only for the IPv4 unicast address family.
• The peer or peer group must be created in unicast IPv4 before you can activate it in
another address family.
• If you specify a BGP peer group by using the peerGroupName argument, all the members
of the peer group inherit the characteristic configured with this command unless it is
overridden for a specific peer.
• The address families that are actively exchanged over a BGP session are negotiated
when the session is established.
• This command takes effect immediately. 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.
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. If a neighbor is activated, BGP also
sends the full contents of the BGP routing table of the newly activated address family.
• Example
Copyright © 2010, Juniper Networks, Inc.46
JunosE 11.2.x BGP and MPLS Configuration Guide
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