Please add route list:
IPv4
/ip route add distance=244 dst-address=194.160.215.0/24 type=unreachable
/routing bgp network add network=194.160.215.0/24
IPv6
/ipv6 route
add distance=200 gateway=2001:470:12:1bc::1
add comment="Discard-Only Address Block [RFC6666]" distance=1 dst-address=\
100::/64 type=unreachable
add distance=244 dst-address=2a0b:6903::/48 type=unreachable
add distance=244 dst-address=2a0b:6903:fdb::/48 type=unreachable
Use 2001:470:12:1bc::1 only BGP tunnel tunnelbroker.net
where
2a0b:6903::/48 and 2a0b:6903:fdb::/48 your network anonced bgp
/routing bgp network add network=2a0b:6903::/48 add network=2a0b:6903:fdb::/48
Check advertisements
/routing bgp advertisements print PEER PREFIX NEXTHOP AS-PATH ORIGIN LOCAL-PREF domru 194.150.214.0/24 18.2.14.3 igp domru... 2a0b:6903:fdb::/48 2a02:2548:a10... igp domru... 2a0b:6903::/48 2a02:2548:a10... igp HE-IPV6 2a0b:6903:fdb::/48 2001:852:12:1... igp HE-IPV6 2a0b:6903::/48 2001:852:12:1... igp