Hi again,
I think you should focus on getting this working before adding more sources to youre NIM server.
As faruk mentions there are a lot of things that can go wrong.
Not sure what he means with "run this command in client.". This is used to allocate resources to a client for a BOS installation on the NIM master.
These protocols are typical to NIM
1 ping
2 bootpd/dhcp
3 tftp
4 nfs
5 nimsh
6 nimaux
You can find a lot of info on NIM is this document
IBM Redbooks | NIM from A to Z in AIX 5L
But sumathi.k please post more info on the error so we can help you ;-)