Thursday, September 12, 2019

Multiple VLANS within the same Subnet

Hi guys , I tested one interesting situation today :

We have 2 hosts in same subnet 10.0.0.1 , 10.0.0.2 for example ,but in different vlans, all ports are in access mode , everything on same switch

port 1 -host A, vlan 10 ,10.0.0.1

port 2 -vlan 10 , cable connected to port 3

port 3 -vlan 20 , cable connected to port 2

port 4 -host B, vlan 20 10.0.0.2

I tried this in lab and ping works between hosts , only cdp doesn't works because vlans are different.

How this works and what are the problems of this?



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