Thanks Holger,
Next hop is already changed to Skypepool. currently the federation is working through Lyncedge pool.
My question is... i want to decommission Lync front end pool as all the users as been migrated to skype pool.
so after decommissioning the lync front end pool will federation work through lync edge pool??
some more information:
1. In Lync front end pool.... Lync edge pool is added in associations in topology
2. In Skype front end pool... skype edge pool is added in associations in topology
3. Next hop for Lync edge pool and skype edge pool is skype front end pool.