we have a bgp peering session with our isp on ipv4 and are learning our default gateway through it. In parallel we have also an ipv6 peering session with the same ISP which allows us to learn the ipv6 default gateway.
But through this second bgp session we are also learning IPv4 prefixes which is not what we want (roughly 3100 ipv4 entries).
I tryed to implement some prefix-list filters without real success.
Does anyone has some insights on how to achieve this (filtering ipv4 address from ipv6 bgp neighbor annoucments).
You are correct. The IPv6 neighbor need to be deactivated under ipv4 unicast AF. The issue is that ipv4 unicast AF is activated by default as soon as you configured a neighbor in global mode. To avoid that the next time, you should configured "no bgp default ipv4-unicast", which will force you to activate the ipv4 unicast AF as it is the case with any other AFs.
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