no neighbor X:X:X::X activate <---appeared by itself
address-family ipv6 neighbor X:X:X::X activate
Maybe it is OK, just haven't ran across this before.
(Sorry, this is a duplicate post. The first one I opened in the wrong place)
**Edit: Just tested this in a simulation and as soon as I activate the neighbor under 'address-family ipv6 unicast', the router creates an ipv4 no activate entry under 'address-family ipv4'. This makes the configuration ridiculously long. Same goes for a 'show ip bgp summary' command. Tons of idle ipv6 neighbors. Is there a way to avoid this?
Seems the command "no bgp default ipv4-unicast" fixes the whole thing. Hope this helps someone.
Re: ["no activate" ipv6 neighbor under ipv4 address-family]
Yes, this is normal behavior. The previous behavior in IOS was to activate address-family ipv4 for all neighbors, including the ipv6 neighbor. This behavior was changed a couple of years back to configure an explicit "no neighbor activate" for ipv6 neighbor", therefore if you ever need to activate address-family ipv4 on an ipv6 neighbor (not recommended), you should explicitly configure it.
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