[rbak-nsp] blackholing/null0

[Marcin Kuczera]

continuation:

the first IP works (is blocked/goes to null0) the second does not:

[bgp1]RedBack_SE100#show ip route 58.30.10.107
     Longest match Routing entry for 58.30.10.107/32 is 58.30.10.107/32 
, version 18557942
     Route Uptime 00:02:12
     Paths: total 1, best path count 1

     Path information :

       Active path :
       Known via bgp 13000, type-External BGP, distance 170, metric 0,
       Tag 0, Originating AS # : 65444, Next-hop 192.0.2.1, NH-ID 0x31200001
[bgp1]RedBack_SE100#show ip route 58.30.10.108
     Longest match Routing entry for 58.30.10.108/32 is 58.30.0.0/18 , 
version 18505727
     Route Uptime 01:46:01
     Paths: total 1, best path count 1

     Route has been downloaded to following slots
      02/0

     Path information :

       Active path :
       Known via bgp 13000, type-External BGP, distance 170, metric 0,
       Tag 0, Originating AS # : 17429, Next-hop 212.106.159.142, NH-ID 
0x34500015, Adj ID: 0x100001D, Interface vlan101
       Circuit 2/1:1023:63/1/2/4105




[bgp1]RedBack_SE100#show ip route 67.43.226.244
     Longest match Routing entry for 67.43.226.244/32 is 
67.43.226.244/32 , version 18557894
     Route Uptime 00:02:48
     Paths: total 1, best path count 1

     Path information :

       Active path :
       Known via bgp 13000, type-External BGP, distance 170, metric 0,
       Tag 0, Originating AS # : 65444, Next-hop 192.0.2.1, NH-ID 0x31200001
[bgp1]RedBack_SE100#show ip route 67.43.226.240
     Longest match Routing entry for 67.43.226.240/32 is 67.43.224.0/20 
, version 14738164
     Route Uptime 1w3d
     Paths: total 1, best path count 1

     Route has been downloaded to following slots
      02/0

     Path information :

       Active path :
       Known via bgp 13000, type-External BGP, distance 170, metric 0,
       Tag 0, Originating AS # : 23522, Next-hop 193.111.38.97, NH-ID 
0x345000A1, Adj ID: 0x10000B3, Interface vlan108
       Circuit 2/1:1023:63/1/2/4111

the only difference is that aggregate routes (i.e. /20) goes via 
different next-hop address.

Looks like some bug in hashing mechanism..

Regards,
Marcin