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OSPF routing (quagga) FreeBSD. Routing tables doesn't change. Help please

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linux-howto

http://serverfault.com – I have a problem with my lab work. I need to provide network routing with ospf. My Net have following properties: http://www.ex.ua/view_storage/959896472784 So... When I start 3 virtual machine with all working interfaces, everything is ok - routing tables is right, all connections work. But when I put down IF1 on R3 machine, after 120 sec routing tables on R1 and R2 have changed. But even after 1 hour routing tables on R2 doesn't change, and I have problem with routing to 172.16.3.0 network. I know in OSPF there are something like "flooding" routing - first wave of changing goes after 120 (HowTos)