Setting up link aggregation on Dell Powerconnect devices

Not so long ago I obtained a pair of Dell Powerconnect switches (2848) from my then employer (who’d chuck them out. I got permission from my manager!). I’d like to set up link aggregation between them and found the manual (still available online!) which describes how. So far, so good. But what I’d like to know from more experienced users is: do I need to set up link aggregation on both switches or will one suffice and the other follow suit?

TIA!

One is the master and the other is the slave and they will need to have the same ID.

OK, thx!