Linux IPv6 routing strange behaviour

[Max Tulyev]

Hi All,

I see the strange behaviour of my Linux routers. There are quagga and
bird with IPv6 BGP full view. Quagga/bird reports about 13500 prefixes,
but route table constantly grow up to 100000 routes and more. Some
routes are duplicated 2,3,5 and even up to 20 times :( And after some
time routing stops working completely, number of routes drops to about
zero, and start to grow again.

Did anyone see something like that? How I can fix it?