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

Question

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 192.168.0.126 255.255.255.0

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.

Answer 1

PVSTP.

Answer 2

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

Comments

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