As my long-awaited sequel to my MikroTik RouterOS v7 BGP configuration, I will do a RouterOS v7 configuration, but this time with IPv6.

The setup will have:

R1 with AS1 and R2 with AS2
1::/64 that R1 will advertise
2::/64 that R2 will advertise
3::/64 for the point-to-point link between R1 and R2

3::1 for R1 and 3::2 for R2

The ether1 interface for the R1 and R2 point-to-point links
The ether2 interface for the internal, to-be-advertised subnet

To setup BGP, first set your IP addresses, on R1:

/ipv6 address
add address=1::1/64 interface=ether1
add address=3::1/64 interface=ether2

On R2:

/ipv6 address
add address=2::1/64 interface=ether1
add address=3::2/64 interface=ether2

Then configure the IP address lists, on R1:

/ipv6 firewall address-list
add address=1::/64 list=bgp-networks
add address=3::/64 list=bgp-networks
/ipv6 route
add blackhole dst-address=1::/64

On R2:

/ipv6 address
add address=2::1 interface=ether1
add address=3::2 interface=ether2
/ipv6 route
add blackhole dst-address=2::/64

Next, we should configure the default AS, on R1:

/routing bgp template
set default as=1 router-id=1.1.1.1

On R2:

/routing bgp template
set default as=2 router-id=2.2.2.2

As a note, we do need an IPv4 router-id as IPv6 is (sadly) not supported here.

Finally, configure BGP, on R1:

/routing bgp connection
add listen=yes local.address=3::1 .role=ebgp name=toR2 output.network=\
    bgp-networks remote.address=3::2 templates=default

On R2:

/routing bgp connection
add listen=yes local.address=3::2 .role=ebgp name=toR2 output.network=\
    bgp-networks remote.address=3::1 templates=default

The BGP should now be set, on R1:

[admin@MikroTik] > /routing/bgp/connection print
Flags: D - dynamic, X - disabled, I - inactive 
 0   name="toR2" 
     remote.address=3::2 
     local.address=3::1 .role=ebgp 
     listen=yes routing-table=main router-id=1.1.1.1 templates=default as=1 
     output.network=bgp-networks 
[admin@MikroTik] >

On R2:

[admin@MikroTik] > /routing/bgp/connection print
Flags: D - dynamic, X - disabled, I - inactive 
 0   name="toR2" 
     remote.address=3::1 
     local.address=3::2 .role=ebgp 
     listen=yes routing-table=main router-id=2.2.2.2 templates=default as=2 
     output.network=bgp-networks 
[admin@MikroTik] >

Full configs

If you prefer the raw MikroTik configuration file, here it is.

For R1:

/routing bgp template
set default as=1 router-id=1.1.1.1
/ipv6 route
add blackhole dst-address=1::/64
/ipv6 address
add address=1::1 interface=ether1
add address=3::1 interface=ether2
/ipv6 firewall address-list
add address=1::/64 list=bgp-networks
add address=3::/64 list=bgp-networks
/routing bgp connection
add listen=yes .role=ebgp name=toR2 output.network=\
    bgp-networks remote.address=3::2 templates=default

For R2:

/routing bgp template
set default as=2 router-id=2.2.2.2
/ipv6 route
add blackhole dst-address=2::/64
/ipv6 address
add address=2::1 interface=ether1
add address=3::2 interface=ether2
/ipv6 firewall address-list
add address=2::/64 list=bgp-networks
/routing bgp connection
add listen=yes .role=ebgp name=toR2 output.network=\
    bgp-networks remote.address=3::1 templates=default