08-23-2004 07:48 PM
Well from the sounds of the original post you had a segmented fabric due to the different PID settings. All switches in a fabric have to use the same PID format or fabric segmentation will occur. The persistant bing issue that Bernd points out does come up when people change fabrics to core PID for the reasons pointed out, but since you were able to just change the setting on the old switches to 1 (core PID) and then you could access your storage points to me that when you first ISL'ed everything together you never created a fabric since the two new switches would not have been able to join the two old switches due to the PID difference. This is actually very common since the new switches come with core PID format by default and older firmwares did not have core PID turned on. To answer another one of your questions, core PID is not required for trunking, but as pointed out by Bernd if you ever want to use a switch larger than 16 ports it is required. So basically with a little bit of pain you have saved yourself some grief in a future upgrade.