Two Machine in different VLAN but on Same subnet address, Will communicate or not and why?

[Dinesh Singh]

 Machine A (192.168.1.1/24)---- (VLAN 5)---- Port (1/1)---Switch A --VLAN 5 ---Port (1/2)--------- Port (1/1)---- VLAN--10--Switch B-------Port (1/2)----VLAN 10)-------Machine B (192.168.1.2/24)

1) Machine A is connected to Port 1/1 ( VLAN 5) of Switch A.

2) Switch A Port 1/2 is connected to Switch B on Port 1/1.

3) Switch A port 1/2 is in VLAN 5 (Access Port).

4) Switch B port 1/1 is in VLAN 10 (Access Port).

5) Machine B is connected to Port 1/2 (VLAN 10) of Switch B.

6) Machine A is having IP address 192.168.1.1/24 connected to Switch A.

7) Machine B is having IP address 192.168.1.2/24 connected to Switch B.

Question) If i ping 192.168.1.2 Machine from Machine 192.168.1.1, Is i can able to ping or not? If yes or No why?.

Highly appreciate your answers.

[Reza Sharifi]

Communication between 2 hosts will work fine as long as the 2 switches are connected to each other by an access port (as it is in your case).  Vlans are locally significant.  So one host can be in vlan 5 on one switch and the other host can be in vlan 10 on the other switch and both hosts can be in the same subnet.

HTH

[Dinesh Singh]

Thank you Sharifi for your reply.. Can you please help How switch A will learn the Mac-address of Machine B connected to switch B, As it on VLAN 10?.

[yoann.wolf67]

In your case, the switch A will have in his mac-address-table :

VLAN     MAC              TYPE     PORTS

5         @MachineB    dynamic   1/2

As Reza said, vlan are locally significant, that's why you'll see vlan 5 in the binding and not vlan 10 which is on your switch B, significant on your switch B by the way ( vlan 10 )

Yoann

[Dinesh Singh]

Thank you very much..

[Joseph W. Doherty]

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Posting

You original question has been answered, but if the switches has CDP active on A's 1/2 and B's 1/1, CDP should log the VLAN mismatch.

If you changed A's 1/2 and B's 1/1 to trunk ports, it wouldn't work unless A's 1/2 had VLAN 5 as the native port and B's 1/1 had VLAN 10 as the native port.