rebuiling Indexes with replication

Dear All,

We have two servers having SQL SERVER 2000 with enterprise edition,

For 1^st Server: I have scenario where i need to rebuild the indexes of few major tables and we have replicated these tables to another server (backup server for reporting purposes)

For 2^nd server: I need to run rebuilding of indexes, but 20 tables out of 49 are not being replicated.

Please advise, do I need to stop the replication process while running the rebuild indexes of these tables. Or replication will not be impacted in any case.

 Please share what plan of action I can execute for this situation.

Somesh