arrow_back Why does the CISCO switch shine its mac on all VLANs?

1 vote
On the cisco on the trunk port:
interface GigabitEthernet1/0/1
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 1,20,100,616
switchport mode trunk
interface Vlan1
ip address
On the upstream switch:
sh mac-address-table int et 1/9 
Read mac address table....
Vlan Mac Address Type Creator Ports
---- --------------------------- ------- -------------------------------------
1 ec-30-91-64-44-01 DYNAMIC Hardware Ethernet1/9
1 ec-30-91-64-44-40 DYNAMIC Hardware Ethernet1/9
20 74-83-c2-90-77-9d DYNAMIC Hardware Ethernet1/9
20 74-83-c2-90-77-a2 DYNAMIC Hardware Ethernet1/9
20 74-83-c2-90-77-c0 DYNAMIC Hardware Ethernet1/9
20 ec-30-91-64-44-01 DYNAMIC Hardware Ethernet1/9
100 58-d9-d5-b6-c5-30 DYNAMIC Hardware Ethernet1/9
100 ec-30-91-64-44-01 DYNAMIC Hardware Ethernet1/9
616 d8-4c-90-30-59-40 DYNAMIC Hardware Ethernet1/9
616 ec-30-91-64-44-01 DYNAMIC Hardware Ethernet1/9
mac cis ec-30-91-64-44-01 Why do I see the poppy in all the domains if it has an IP address only in the first domain? With other switches (D-Link, SNR) there is no such thing. I don't know how to google it, so I decided to ask here.

2 Answers

Best answer
0 votes
0 votes
What you wrote the IP address has nothing to do with the mac table
look for the handle in the arp table

The poppy table is constructed differently for each vlan. the vlanes provide the necessary isolation.
so it makes no sense to assign different poppies to the same physical interface in different domains
although many manufacturers do

1 comment

Apparently you didn't understand the question.
The question is not why the poppy is the same, but why is it even present in other domains?
If it were a D-Link, it would only shine its mac in the control room.

Above, Andrey Barbolin has already answered why. Per VLAN ST