Cisco Support Community
Showing results for 
Search instead for 
Did you mean: 

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. And see here for current known issues.

New Member

how to prevent vlans from communicating with each other?

hello guys:

I'm currently planning a network with a few VLANS. Unfortunatly, I'vegone into somw trouble of solveing this!

This is what I got:

basic requirements:

1. all vlans are not able to communicating each other.

2. all vlan hosts can access server vlan (the one in the middle)


as you could see, the toppology is really simple ,

i can make building 1 ,2 and 3 into three different vlans and use router-on-stick to connect them to the internet. 

but  i was told there are different offices within each buiding. obviously they don't want communication between offices except servers in the middle. there are 50 offices, by the way.

do i really need over 50 vlans to solve this problem? if so, implementing ACL to prevent vlans from communicating  each other  will be a daunting task for me .

can Pvlan help here?

Everyone's tags (1)