cancel
Showing results for 
Search instead for 
Did you mean: 
cancel
340
Views
0
Helpful
3
Replies

trunking problem

enkli
Beginner
Beginner

Hello.

I have to connect two sites(I have connected them and everything works OK).

The problem is that I do not want that broadcasts come from one site to another.

So I have created another vlan on HQ and Remote SWITCH. I have set the port to witch the server is connected to trunk mode allowing the two VLANS.

So when I connet a computer on the remote site I cannot ping that. Any Idea

3 Replies 3

Giuseppe Larosa
Hall of Fame Master Hall of Fame Master
Hall of Fame Master

hello Enkli,

only a L3 routed link is a firewall for broadcasts

a L2 trunk when working does not block broadcasts.

if 802.1Q trunk verify if native mismatch at the two sides of the link.

this can be a problem.

verify using

sh interface type x/y switchport

check for native vlan line

Hope to help

Giuseppe

LordFlasheart
Beginner
Beginner

Further to Giuseppe's answer you can remove VLANs from trunks by issuing the "switchport trunk allowed vlan remove" command.

HTH

hobbe
Rising star
Rising star

If you do not want broadcasts to come from site A to site B then you could do one of two things.

Routing, that would set the systems on the different sites in different broadcast domains.

ACL

Acces-control Lists on the outside interface of the switch where you block the inbound broadcast address.

I would go with routing.

The acls will most likely cause problems for you somewhere down the line.

Why do you not want broadcasts to go from A to B ?

Broadcasts are a quite essential part of IP if you are in the same subnet and broadcast zone.

Getting Started

Find answers to your questions by entering keywords or phrases in the Search bar above. New here? Use these resources to familiarize yourself with the community:

Recognize Your Peers