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When FortiGate peers with other devices, there are instances where the BGP peering with IPV4 would flap even though the link is stable.
When the BGP is configured using the GUI, the 'config network6' would be added.
The BGP debug would also show 'Update MP Reach: Prefix ::/128'.
Enable BGP debugs:
diagnose ip router bgp all enable
diagnose ip router bgp level info
diagnose debug enable
To disable BGP debugs:
diagnose ip router bgp all disable
diagnose ip router bgp level none
diagnose debug reset
From the BGP error message, it could be seen that 'UPDATE Message Error/Optional Attribute Error.' was received from the peer.
This would cause the peer to bring down the peering due to not accepting the IPv6 prefix.
To avoid the advertisement for the IPv6 prefix over BGP, the following command can be configured:
config router bgp
config neighbor
edit "NEIGHBOR-PEER-IP"
set activate6 disable
next
end
end
The FortiGate will stop advertising the IPv6 prefix to the neighbor.
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