[hans_sr]

Доброго времени суток. Есть самый обычный eBGP сосед. Который, казалось бы, шлет один самый обычный nlri. При этом сталкиваюсь вот с такой, не понятной для меня, ситуацией, и как ее можно "загуглить" ума не приложу.

 

cisco#sh ip bgp x.x.x.0/24
BGP routing table entry for x.x.x.0/24, version 119452493
Paths: (2 available, best #1, table default)
 Advertised to update-groups:
    39         46         50        
 Refresh Epoch 1
 200xxx
   y.y.y.70 from y.y.y.70 (y.y.y.70)
     Origin IGP, metric 0, localpref 100, weight 400, valid, external, best
     Community: cccc:500
 Refresh Epoch 1
 200xxx, (received-only)
   y.y.y.70 from y.y.y.70 (y.y.y.70)
     Origin IGP, metric 0, localpref 100, valid, external

cisco#sh ip bgp x.x.x.0
% Network not in table

cisco#sh ip bgp x.x.x.127
% Network not in table

cisco#sh ip bgp x.x.x.128
BGP routing table entry for x.x.x.0/24, version 119452493
Paths: (2 available, best #1, table default)
 Advertised to update-groups:
    39         46         50        
 Refresh Epoch 1
 200xxx
   y.y.y.70 from y.y.y.70 (y.y.y.70)
     Origin IGP, metric 0, localpref 100, weight 400, valid, external, best
     Community: cccc:500
 Refresh Epoch 1
 200xxx, (received-only)
   y.y.y.70 from y.y.y.70 (y.y.y.70)
     Origin IGP, metric 0, localpref 100, valid, external

cisco#sh ip bgp x.x.x.255
BGP routing table entry for x.x.x.0/24, version 119452493
Paths: (2 available, best #1, table default)
 Advertised to update-groups:
    39         46         50        
 Refresh Epoch 1
 200xxx
   y.y.y.70 from y.y.y.70 (y.y.y.70)
     Origin IGP, metric 0, localpref 100, weight 400, valid, external, best
     Community: cccc:500
 Refresh Epoch 1
 200xxx, (received-only)
   y.y.y.70 from y.y.y.70 (y.y.y.70)
     Origin IGP, metric 0, localpref 100, valid, external


cisco#sh ip route x.x.x.1
Routing entry for x.x.x.0/24
 Known via "bgp cccc", distance 20, metric 0
 Tag 200xxx, type external
 Redistributing via ospf 1
 Advertised by ospf 1 metric 1000 subnets route-map bgp2ospf
 Last update from y.y.y.70 17:13:51 ago
 Routing Descriptor Blocks:
 * y.y.y.70, from y.y.y.70, 17:13:51 ago
     Route metric is 0, traffic share count is 1
     AS Hops 1
     Route tag 200xxx
     MPLS label: none

cisco#sh ip route x.x.x.255
Routing entry for x.x.x.0/24
 Known via "bgp cccc", distance 20, metric 0
 Tag 200xxx, type external
 Redistributing via ospf 1
 Advertised by ospf 1 metric 1000 subnets route-map bgp2ospf
 Last update from y.y.y.70 17:13:54 ago
 Routing Descriptor Blocks:
 * y.y.y.70, from y.y.y.70, 17:13:54 ago
     Route metric is 0, traffic share count is 1
     AS Hops 1
     Route tag 200xxx
     MPLS label: none

 

Происходит это на ASR1000 Version 15.1(3)S1, RELEASE SOFTWARE (fc1)

 

Есть этому научное объяснение?