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Solved
LAG ports create DUP packets and STP chaos
Hi all. We have exchanged or previous Aruba switches with Netgear XSM4348S switches, which are acting as a stack (4 switches). Behind these switches are GSM4328S & GS728TPPv2, which are connected...
Today I gave it another try - long story short:
not the stack switch was the problem but the M4300s behind it. AFAIK all M4300 don't use the static mode by default which means that LACP is used. I had to reset the M4300 to factory defaults (but not the stack) and start over. After I reconfigured the M4300s which are connected behind the stack by re-importing the config the LAG came up as usual and works.
Side notice: when using a standard LAG in the M4300 series in combination with the mentioned Smart Managed switches (GS728TPPv2) you have to set the LACP mode on the GS728TPPv2 manually. Unlike the M4300s the Smart Managed switches seem to use the static mode by default. Same applies to other vendors like HP (ProCurve series).
The LAG show down if the mode (LACP) isn't configured on both ends, or the the wrong links are assigned (or plugged) for the LAG. If another switch in the same LAG does proof, figure - a loop is predictable. Nothing you don't know already of course.
Netgear Support should be able to help, not sur fellow LaurentMa is able to join in or offer the Pro AV support email channel here.
Netgear Support should be able to help, not sur fellow LaurentMa is able to join in or offer the Pro AV support email channel here.
Today I gave it another try - long story short:
not the stack switch was the problem but the M4300s behind it. AFAIK all M4300 don't use the static mode by default which means that LACP is used. I had to reset the M4300 to factory defaults (but not the stack) and start over. After I reconfigured the M4300s which are connected behind the stack by re-importing the config the LAG came up as usual and works.
Side notice: when using a standard LAG in the M4300 series in combination with the mentioned Smart Managed switches (GS728TPPv2) you have to set the LACP mode on the GS728TPPv2 manually. Unlike the M4300s the Smart Managed switches seem to use the static mode by default. Same applies to other vendors like HP (ProCurve series).
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