[c-nsp] Same MAC addresses from two ports on different VLAN

[Phil Mayers]

On 03/14/2010 06:33 PM, Jay Nakamura wrote:
> On Sun, Mar 14, 2010 at 8:51 AM, Phil Mayers<p.mayers at imperial.ac.uk>  wrote:
>> On 03/12/2010 07:21 PM, Jay Nakamura wrote:
>>>
>>> We have an Extreme Summit switch where I found that if you have two
>>> separate ports on different VLANs, and the same MAC address enters the
>>> switch on those two completely different VLANs, the switch will start
>>> having problems forwarding traffic.  (Or only use the first entry in
>>> the FDB, I am not sure what it actually does other than half of the
>>> traffic drops.)  Extreme support has confirmed that this is by design.
>>
>> Which model? We've run several.
>
> Summit X350
> XOS 12.0.4.5
>
> Yes, XOS is a little old.  But I don't want to go through maintenance
> and upgrade if it won't fix the problem.
>
>
>> The only time I've ever seen this is when netlogin is enabled; you can't
>> have a mac which is inserted into the FDB via netlogin on two ports.
>>
>> It certainly doesn't happen with "ordinary" configs.
>
> Yet the extreme support people are saying that this is how it is.

I don't understand; you are running netlogin? In which case yes, this is 
a feature, not a bug?