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06-09-2017 07:06 AM
06-09-2017 07:06 AM
2900-48G (J9050A) learns dynamic VLANs even if disabled
Two switches of type "2900-48G (J9050A)", both running the latest firmware (T.13.84) will dynamically learn VLANs advertised via GVRP, even if "unknown-vlans" is set to "disable" on all interfaces.
I suspect this is a firmware bug.
What I did is:
config
show gvrp
(tells me gvrp is currently off)
show vlans
(does not know any GVRP vlans yet)
interface all unknown-vlans disable
gvrp
show gvrp
(tells me "unknown vlan" is set to "disabled" for every interface)
gvrp
show vlans
(shows a bunch of GVRP vlans learned from upstream *even though the switch is not supposed to learn vlans through interfaces that are "unknown-vlans disabled"*)
Is this a known problem? I'm having a hard time believing that this slipped past QA, so maybe I'm still doing something wrong (however the exact same procedure does work as expected on a dozen other procurve switches. It seems that only J9050A is affected.
What do?
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06-09-2017 07:12 AM
06-09-2017 07:12 AM
Re: 2900-48G (J9050A) learns dynamic VLANs even if disabled
correction: One of the affected switches is actually 2900-24G (J9049A), same firmware (T.13.84)
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06-12-2017 06:27 AM
06-12-2017 06:27 AM
Re: 2900-48G (J9050A) learns dynamic VLANs even if disabled
For the record, the problem disappeared after temporarily setting all interfaces back to learning
i.e. "interface all unknown-vlans learn"
and then (once again) disabling:
i.e. "interface all unknown-vlans disable"
Color me underwhelmed (I hate "turning it off and on again"-sort of solutions).
This makes it pretty clear that there's an underlying firmware issue involved.
.