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When BGP is configured with 'no bgp default ipv4-unicast,' configuring a peer-group with IPv6 members adds 'neighbor <neighbor> activate' for the IPv6 neighbors under address-family ipv4.
Despite disabling IPv4 unicast for BGP by default, neighbors in the peer group have the IPv4 unicast address family enabled.
This occurs when the following conditions are met: -- 'no bgp default ipv4-unicast' is configured in imish. -- 'neighbor <neighbor> peer-group <peergroup>' is configured.
Delete the line in the configuration that was automatically added in imish in the 'router bgp' section: no neighbor <neighbor> activate
Configuring IPv6 members of a peer-group when 'no bgp default ipv4-unicast' no longer automatically enables IPv4 unicast for the peer-group members.
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