На AS254 передаются все маршруты. На все остальные роутеры передается только маршрут до AS254.
root@vds2032565:~# telnet 0 2605 Trying 0.0.0.0... Connected to 0. Escape character is '^]'. Hello, this is Quagga (version 1.2.4). Copyright 1996-2005 Kunihiro Ishiguro, et al. User Access Verification Password: ihor> enable ihor# show running-config Current configuration: ! hostname ihor password zebra log stdout ! router bgp 2021 bgp router-id 10.123.156.1 neighbor 10.123.156.3 remote-as 254 neighbor 10.123.156.3 description my_home_AS254_net254 neighbor 10.123.156.3 update-source tap0 neighbor 10.123.156.4 remote-as 22 neighbor 10.123.156.4 description primorstroi_AS22_net22 neighbor 10.123.156.4 update-source tap0 neighbor 10.123.156.4 route-map NET_254 out neighbor 10.123.156.5 remote-as 44 neighbor 10.123.156.5 description kommunar_AS44_net44 neighbor 10.123.156.5 update-source tap0 neighbor 10.123.156.5 route-map NET_254 out neighbor 10.123.156.6 remote-as 20 neighbor 10.123.156.6 description vkus_AS20_net20 neighbor 10.123.156.6 update-source tap0 neighbor 10.123.156.6 route-map NET_254 out ! address-family ipv6 exit-address-family exit ! ip prefix-list FROM_AS254 seq 10 permit 192.168.254.0/24 ! route-map NET_254 permit 20 match ip address prefix-list FROM_AS254 ! line vty ! end ihor#