Enabling VPN Address Exchange

To limit the exchange of routes to those from within the VPN-IPv4 address family, and to set other desired BGP parameters:

1. Specify that the router exchanges addresses within a VPN by choosing the VPN-IPv4 address family.
2. Specify individual neighbors or peer groups to exchange routes with from only within the current (VPN-IPv4) address family.
3. Configure BGP parameters for VPN services.

   See Configuring BGP Routing , for information about configuring BGP sessions. The section Understanding BGP Command Scope has tables that list BGP commands according to their scope. From Address Family Configuration mode, you can issue the commands in Table 8 and Table 10.

4. Exit Address Family Configuration mode.

address-family

• Use to configure the router to exchange IPv4 addresses in VPN mode.
• The default setting is to exchange IPv4 addresses in unicast mode from the default router.
• This command takes effect immediately.
• Example

  host1:vr1(config-router)#address-family vpnv4

• Use the no version to disable the exchange of a type of prefix.
• See address-family.

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 neighbors to exchange routes with from within the current address family.
• 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

  host1:vr1(config-router-af)#neighbor 192.168.1.158 activate

• 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.
• See neighbor activate.

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