jncip -ISIS problem

gemesat

as we know , int the case study for ISIS we made the aggregate route on R5 to route 192.168/22 and inject it as the ISIS Level2 by the sum policy and the R4 &R3 can see it in there routing table as below:


root@r3> show isis database r5 detail

r5.00-00 Sequence: 0xd, Checksum: 0x6f0f, Lifetime: 3144 secs
IS neighbor: r3.04 Metric: 1
IS neighbor: r5.02 Metric: 1
IP prefix: 10.0.2.0/30 Metric: 1 Internal Up
IP prefix: 10.0.2.8/30 Metric: 1 Internal Up
IP prefix: 10.0.3.5/32 Metric: 0 Internal Up
IP prefix: 10.0.8.0/21 Metric: 10 External Up
IP prefix: 192.168.0.0/22 Metric: 10 External Up



THE Problem :

when i establish IBGP sessions between R5&R4&R3 >> the ISIS level2 route 192.168/22 disappear as below :

root@r3> show isis database r5 detail

r5.00-00 Sequence: 0xd, Checksum: 0x6f0f, Lifetime: 3144 secs
IS neighbor: r3.04 Metric: 1
IS neighbor: r5.02 Metric: 1
IP prefix: 10.0.2.0/30 Metric: 1 Internal Up
IP prefix: 10.0.2.8/30 Metric: 1 Internal Up
IP prefix: 10.0.3.5/32 Metric: 0 Internal Up
IP prefix: 10.0.8.0/21 Metric: 10 External Up


Note : i made traceaction on ISIS protocal to know the reason when i activate ibgp and i get this below log but i don`t know what`s the meaning :

-Oct 24 19:42:00.226161 Deleted L2 route 192.168.0.0/22 from fragment 0
-Oct 24 19:42:00.226248 Rejected L2 route 192.168.0.0/22



I`m looking forward to your reply and thanks inadvance for your cooperation



BR,
Geme