Плохо сходится ospf-ibgp (10-40сек), нутром чую что решаемо (до 2-4сек).

кольцо из четырех железок с3825,два cat3550,quagga.
в ospf только лупбэки(99.24.0.x),
на лупбэках ibgp и в нем все маршруты.

Смотрю с c3825 как выглядит коннектед маршрут(99.24.1.241) на соседней железке(99.24.0.4).
nexthop для него соответсвенно сначала дальний лупбэк(99.24.0.4), nexthop которого берется из ospf:

cisco2.febus#sh ip route 99.24.1.241
Routing entry for 99.24.1.240/29
  Known via "bgp 61137", distance 200, metric 1, type internal
  Last update from 99.24.0.4 00:02:30 ago
  Routing Descriptor Blocks:
  * 99.24.0.4, from 99.24.0.4, 00:02:30 ago
      Route metric is 1, traffic share count is 1
      AS Hops 0

cisco2.febus#sh ip route 99.24.0.4
Routing entry for 99.24.0.4/32
  Known via "ospf 1", distance 110, metric 11, type intra area
  Last update from 99.24.7.242 on GigabitEthernet0/1.907, 00:01:13 ago
  Routing Descriptor Blocks:
  * 99.24.7.242, from 99.24.0.4, 00:01:13 ago, via GigabitEthernet0/1.907
      Route metric is 11, traffic share count is 1

cisco2.febus#sh ip route ospf
     99.0.0.0/8 is variably subnetted, 84 subnets, 5 masks
O       99.24.0.7/32 [110/3] via 99.24.7.225, 00:01:13, GigabitEthernet0/1.800
O       99.24.0.4/32
           [110/11] via 99.24.7.242, 00:01:13, GigabitEthernet0/1.907
O       99.24.0.2/32 [110/2] via 99.24.7.225, 00:01:13, GigabitEthernet0/1.800
O       99.24.0.3/32 [110/11] via 99.24.7.250, 00:01:13, FastEthernet1/0.905

cisco2.febus#sh ip cef 99.24.1.241
99.24.1.240/29, version 860715, epoch 0, cached adjacency 99.24.7.242
0 packets, 0 bytes
  Flow: AS 0, mask 29
  via 99.24.0.4, 0 dependencies, recursive
    next hop 99.24.7.242, GigabitEthernet0/1.907 via 99.24.0.4/32
    valid cached adjacency

Рву линк Gi0/1.907 shut, сразу исчезает nexthop из ospf:

cisco2.febus#sh ip route ospf
     99.0.0.0/8 is variably subnetted, 84 subnets, 5 masks
O       99.24.0.7/32 [110/3] via 99.24.7.225, 00:01:47, GigabitEthernet0/1.800
O       99.24.0.2/32 [110/2] via 99.24.7.225, 00:01:47, GigabitEthernet0/1.800
O       99.24.0.3/32 [110/11] via 99.24.7.250, 00:01:47, FastEthernet1/0.905

Через 2-4сек появляется новый nexthop:

cisco2.febus#sh ip route ospf
     99.0.0.0/8 is variably subnetted, 82 subnets, 5 masks
O       99.24.0.7/32 [110/3] via 99.24.7.225, 00:00:06, GigabitEthernet0/1.800
O       99.24.0.4/32
           [110/13] via 99.24.7.225, 00:00:06, GigabitEthernet0/1.800
O       99.24.0.2/32 [110/2] via 99.24.7.225, 00:00:06, GigabitEthernet0/1.800
O       99.24.0.3/32 [110/11] via 99.24.7.250, 00:00:06, FastEthernet1/0.905

Но ещё 10-40 секунд он никак не может усвоиться:

cisco2.febus#sh ip cef 99.24.1.241
99.24.0.0/21, version 6, epoch 0, attached
0 packets, 0 bytes
  Flow: AS 0, mask 21
  via Null0, 0 dependencies
    valid null adjacency

Подскажите куда дальше ковырять?