SF350-24P strange mac address table?

[Nolaan]

Hello,

I have something strange in the mac table on the switch SF350-24P

It should look like this:

#show mac address-table vlan 410
Flags: I - Internal usage VLAN
Aging time is 300 sec

    Vlan          Mac Address         Port       Type
------------ --------------------- ---------- ----------
    410        00:30:4f:55:20:40      gi3      dynamic
    410        00:9a:d2:c6:51:34      gi3      dynamic
    410        00:9a:d2:c6:52:66      fa11     dynamic
    410        84:16:f9:18:08:54      gi3      dynamic

But every few minutes I have this:

    Vlan          Mac Address         Port       Type
------------ --------------------- ---------- ----------
    410        00:30:4f:55:20:40      gi3      dynamic
    410        00:9a:d2:c6:51:34      gi3      dynamic
    410        00:9a:d2:c6:52:66      gi3      dynamic
    410        84:16:f9:18:08:54      gi3      dynamic

And the host with the mac address 00:9a:d2:c6:52:66 that is directly connected to the switch (fa11) becomes unavailable.

On the KC01 (SG300-28SFP) switch, the mac array always looks good.

Port configuration on SW01

!
interface GigabitEthernet3
 gvrp enable
 spanning-tree link-type point-to-point
 switchport mode general
 switchport general allowed vlan add 100,410 tagged
 switchport general pvid 4095
 macro description switch
 !next command is internal.
 macro auto smartport dynamic_type switch
!

Port configuration on KC01

interface gigabitethernet1
 gvrp enable
 switchport mode general
 switchport general allowed vlan add 100,410 tagged
 switchport general acceptable-frame-type tagged-only
 switchport general pvid 4095

Versions:

SW01 (SF350-24P)

Active-image: flash://system/images/image_tesla_hybrid_2.4.0.94.bin
  Version: 2.4.0.94
  MD5 Digest: 6f5be217100f34929986f2e93dd2d5e9
  Date: 31-May-2018
  Time: 02:39:58
Inactive-image: flash://system/images/image1.bin
  Version: 2.3.5.63
  MD5 Digest: 5881484e04bcdcc17c32872445e3ab8d
  Date: 20-Aug-2017
  Time: 19:04:55

KC01 (SG300-28SFP)

SW version    1.4.9.4 ( date  04-Jun-2018 time  00:07:58 )
Boot version    1.3.5.06 ( date  21-Jul-2013 time  15:12:10 )
HW version    V03

Any ideas what is wrong or what I configured wrong?

[Seb Rupik · Accepted solution]

Hi there,

Possibly you could have a loop on KC01. A broadcast from 52:66 is being received on Gi2, then looped on KC01 and sent back out Gi2 towards SW01.

SW01 sees these frames and updates its MAC address table with Gi3 as the source.

cheers,

Seb.

[Nolaan]

You were right. The problem was LAG between SG300 and old SRW248-G4 (one link does not work) I deleted LAG and it's OK.

I still have a problem with GVRP on SF350, but this is what I will describe in the new thread.