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Forwarding table question

Mon Mar 22, 2021 11:55 am

Hello

I have a question with regards forwarding table (bridge table) on a CHR host (GNS3/QEMU lab environment under ESXi if it makes any difference).
It is at the end of the post

Here is the list of interfaces and their MAC addresses.
interfaces.PNG
Here is the bridge configuration.
VLAN21 has only one access port (where test PC is connected) and one trunk port (uplink)
bridge-config.PNG
VLAN configuration
vlan.PNG
It is how forwarding table looks like with highlighted unknowns..
bridge-host2.PNG


Everything works as expected, but, those unknown lines
ether1 - with NO VID (item 0). Why this entry with NO VID appears in the table? That's I don't understand. I tried to disable MAC-Server + MAC-Server Winbox entirely. Didn't help
ether1 - with VID 1 (item 2). That's ok and there is an IP address linked to it (untagged traffic)
ether1 - with VID 21 (item 4). That's ok as port is carrying VLAN 21 tagged traffic

ether16 - with NO VID (item 1). Why this entry with NO VID appears in the table? That's I don't understand. I tried to disable MAC-Server + MAC-Server Winbox entirely. Didn't help
ether16 - with NO VID (item 5). That's ok. Test PC is connected here

Please help
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