On Aug 29, 2012, at 1:18 PM, Harald Schmalzbauer <h.schmalzba...@omnilan.de> wrote:
> schrieb Pete French am 29.08.2012 11:38 (localtime): >>> Link aggregation can never work with two separate switches! LACP and >>> static trunking require both sides to bundle the same trunk. which is >>> impossible for two separate switches. >> These switches had a port where you could connect them together and >> then configure each to know about the other switch, and to do LACP >> across the pair of them. Or at least thats what it looked like it >> was capable of doing, and it appeared to be doing LACP when configured >> that way and connected to Windows machines, just not FreeBSD ones. But I'm > > What you desciribe is well known as „stacking“ (not to mix with „virtual > stacking“) and sorry that I haven't made clear that in such a case LACP > (also static trunking of course) works well and is a fantastic way to > gain redundancy. > When you create a physical switch stack, the individual switches are no > separate switches anymore, but act like one big switch. > With the advantage, that in case of a failure, and a trunk configured > over two different units of the stack, the link remains active. > But like mentioned, these switches are then not considered to be > separate („virtual stacking“ only combine them in management regards, > _not_ physically, so be carefull when you look for switches with > „stacking“ capabilities!). > The disadvantage of the real hardware stackable switch is the price. The > cheapest way I've found is two DGS-3120 (~700$ each plus 200$ stacking > cable). Ciscos and Junipers and the bigger HPs are all much above afaik. > > -Harry > Not always. For example Extreme Networks's MLAG allows link aggregation between two switches, that are not stacked. You just have to create a special vlan between them and configure them for MLAG. But of course this is proprietary protocol. _______________________________________________ freebsd-net@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-net To unsubscribe, send any mail to "freebsd-net-unsubscr...@freebsd.org"
