Victor,  If you dont have any single port also left free on your switch to connect ISL to new switch which you planning to buy then you have to take downtime for those ports ( or hosts connected to those ports ) which will be used to connect new switches.For your case I suggest,connect two ISL's to the new switch for redudancy. Out of two ports take one from first eight and one from last eight on  DS 200B16.  On New switch :- 1) Power on and login to it and disable the switch - [switchdisable] 2) Clear the config if any on new swich ( it should not be ) - [cfgclear & cfgsave ] 3) Change the domain ID to anything apart from the ones in exisitng fabric and keep the remaining paramters same as existing swich. [configure and set fabric.ops] 4) configure two ports as E ports which you decide to use for connecting to existing fabric. [ portcfgeport ] 5) disable those two ports [ portdisable ]  On existing switch :- 1) Free two ports on your exisitng switch for ISL purpose to new switch. ( you have to plan your way) 2) Disable those two ports  - [ portdisable ] 3) Physically connect cables across switches. 4) Enable those ports on both switches one after other.  Check switchshow , islshow and others and hopefully it should merge and you can see single fabric. In case of any merge issue you can check for the reasons and solve. Best help you will get in brocade admin guide for all comands and processes and release notes in case mismatch of codes .  Regards, Mrinal Dani
Hi team,  I want to extend my SAN network by adding new SAN switches.My existing SAN consists of DS 200B switches.How i can done this work?.Will Inter switch linking is possible ? .Do i have to purchase ISL Trunking license if loadbalancing and failover are needed ?. What is the recommendation for purchasing the new switchs?.By connecting the old and new switches through patch cable is enough (having same domain ID) for work to be done.   Thanks
Addition of SAN switches