[c-nsp] Cat 3750E w/ MAC learning disabled shutting port?

[Blake Dunlap]

Is it the only up port participating in that vlan?

On Fri, Apr 24, 2015 at 8:40 AM, Lukas Tribus <luky-37 at hotmail.com> wrote:
>> Hello people,
>>
>> I am looking for an explanation for a strange port flap that I
>> experienced this afternoon and out of desperation (and because I can not
>> find an answer on Cisco, Google, you name it and I am not yet desperate
>> enough to open a TAC case) I am posting here.
>>
>> Here is the situation:
>> Catalyst 3750E has several VLANs. One VLAN has mac-learning disabled.
>> The VLAN is tagged on one TenG interface and untagged on a GigE.
>> The TenG interface went down due to a transmission problem. The GigE
>> interface went Lineproto-down too. Thats weird.
>
> I would guess that the box connected to the GigE interface has some
> kind of heartbeat running towards the other end of the network and
> resets itself (or the interface) in case the communication breaks. Like a
> "suicide-is-better-than-a-split-brain" protection?
>
> Seems strange for a Catalyst to drop the link in this case. Is the box
> in a stack?
>
>
>
> Lukas
>
>
>
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