Hi, > Thanks for you input. 802.3ad seems better but I am not in a position > to terminate both links in the same switch or same stack. Some switches support LACP across several devices - for example the cisco 3750 with extended image can "glue" several switches together to one virtual switch and thus provide LACP support over several devices. Of course there is a good deal of money involved. By the way, using other modes over multiple switches involves using ISLs (inter switch links, that means direct connections between switches)*. If you use that you have to make sure algorithms that take time for recalculation (like spanning tree) do not interfere at the moment of a link failure because then your cluster communication maybe runs into a timeout also. Dirk * the reason is that you have to handle the following case: server a bonds to switch 1 and switch 2 with link 1a and 2a server b bonds to switch 1 and switch 2 with link 1b and 2b Now link 1a failes. And before you fix that, link 2b fails as well. Now you are glad to have an ISL. :-)