Forum Discussion

Nimbostratus

Jan 18, 2012

LTM Connection to Dual Switches

Hello Everyone, I am hoping that someone can help me understand which connection type is best for F5. We currently have two F5's in an active/failover cluster. In our environment, we are going a...

config

design

mikand_61525

Nimbostratus

Jan 22, 2012

Techgeeeg: You mean regarding the LACP active and LACP passive modes?

When LACP active is set the unit will send LACP packets every now and then (at least at the moment when a link goes up) to inform the other side that this unit wants to do LACP (instead of letting STP (spanning tree) disable the "looping" interface if you have STP enabled).

The other unit must be in either LACP active or LACP passive mode in order to having this LACP trunk to form.

So except from manually set up the bundling (which I would recommend because then you know where you are expected to have a bundle or not, at least by manually set dedicated interfaces into LACP active mode) the auto feature works as:

unit1: LACP active

unit2: LACP passive

= LACP trunk will form

unit1: LACP active

unit2: LACP active

= LACP trunk will form

unit1: LACP passive

unit2: LACP passive

= no LACP trunk will form (loop occurs unless you have STP enabled)

unit1: LACP active

unit2: no LACP

= no LACP trunk will form (loop occurs unless you have STP enabled)