The IPv6 BGP routing tree is obtained elaborating
the AS path information of the IPv6 BGP routing table.
A link to detailed routing information is available at the end of each branch
of the tree.
Warnings (!) are raised for odd and unstable routes:
U raises a warning that a route entry is Unstable;
O raises a warning that there are Odd route entries
(invalid or unaggregated prefixes).