--> BGP is supports multi protocol capability.
--> By default when we will give neighbor with IP address automatically it will be added into IPV4 address family.
--> If you dont want to put the neighbor in IPv4 address family by default then we have to give following command.
Router(config)# no bgp default ipv4-unicast
--> Now we have to specify each address family manually for the neighbor that it want to exchange routes.
For example if we want to exchange vpnv4 routes with neighbor 1.1.1.1
Router (config)# router bgp 100
Router (config)# no bgp default ipv4-unicast
Router (config)# neighbor 1.1.1.1 remote-as 100
Router(config)# address-family vpnv4
Router(config-af)# neighbor 1.1.1.1 activate
---> All your network commands from now should enter into address family section.
--> As soon as we will give no bgp default ipv4-unicast, new neighbors will not be added automatically into ipv4 address family by default. we have to do manually.
--> By default when we will give neighbor with IP address automatically it will be added into IPV4 address family.
--> If you dont want to put the neighbor in IPv4 address family by default then we have to give following command.
Router(config)# no bgp default ipv4-unicast
--> Now we have to specify each address family manually for the neighbor that it want to exchange routes.
For example if we want to exchange vpnv4 routes with neighbor 1.1.1.1
Router (config)# router bgp 100
Router (config)# no bgp default ipv4-unicast
Router (config)# neighbor 1.1.1.1 remote-as 100
Router(config)# address-family vpnv4
Router(config-af)# neighbor 1.1.1.1 activate
---> All your network commands from now should enter into address family section.
--> As soon as we will give no bgp default ipv4-unicast, new neighbors will not be added automatically into ipv4 address family by default. we have to do manually.
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