BGP wrong AS

HI All,

while  was doing the CCIE RS Vol2 Lab2, keeping getting this wrong AS log in SW1 from BB#.

Rack10SW1(config)#
*Mar  1 00:55:47.935: %BGP-3-NOTIFICATION: received from neighbor 204.12.10.254 2/2 (peer in wrong AS) 2 bytes 0190
Rack10SW1(config)#
*Mar  1 00:55:49.990: %BGP-3-NOTIFICATION: received from neighbor 204.12.10.254 2/2 (peer in wrong AS) 2 bytes 0190

While I tdid a check on BB3, I can see that the SW1 nei is formed with AS as 100.

from the diagram, it shows the SW1 should be in AS 400. and SW1, BGP nei is configured with BB3 as AS54.

RS.10.10.BB3>sh ip bgp summ

Neighbor        V    AS MsgRcvd MsgSent   TblVer  InQ OutQ Up/Down  State/PfxRcd
172.16.4.1      4    54     143     142       11    0    0 02:17:03        8
204.12.10.1     4   100       0       0        0    0    0 never    Active
204.12.10.2     4   100       0       0        0    0    0 never    Active
204.12.10.3     4   100       0       0        0    0    0 never    Active
204.12.10.4     4   100       0       0        0    0    0 never    Active
204.12.10.5     4   100       0       0        0    0    0 never    Active
204.12.10.6     4   100       0       0        0    0    0 never    Active
204.12.10.7     4   100     151     157        0    0    0 00:02:10 Closing
204.12.10.8     4   100       0       0        0    0    0 never    Active
204.12.10.9     4   100       0       0        0    0    0 never    Active
204.12.10.10    4   100       0       0        0    0    0 never    Active
RS.10.10.BB3>

This log is keeping coming Up and i ma not able to get any routes from BB3 to do the RIP configurea tion part.

Can anyone advice how could we solve this one?

Thanks

RIYAs