Private vlan, dhcp server and RB1100AHx2

RouterOS Beginner Basics
1

Hello,

I have a problem with my RB1100AHx2

The config below is from a Allied Telesis AT-8648 switch.
create vlan=“Users” vid=101 private
add vlan=101 port=48 uplink frame=tagged
add vlan=101 port=1 frame=untagged
add vlan=101 port=2 frame=untagged
add vlan=101 port=3 frame=untagged

If connect a eg. a ordinary Zyxel router LAN port to port 48 in the AT-8648 switch and connect a Pc to port 1 to 3. The Pc gets an ip address from the Zyxel router.

When I connect the RB1100AHx2 to port 48 in the AT-8648 I get no addresses from the dhcp server in the RB1100. I have checked that I get an ip-address when I connect my Pc directly to the RB1100AHx2.

What am I missing in the RB1100 box?

Kind regards
Thomas

2

Probably something with the tagged packages leaving port 48 on the AT switch.
Possibly the working Zyxel is not handling the vlan tagged traffic, while the mikrotik is.
What you could do is create a vlan 101 on the port connected to the AT switch, put that vlan in a bridge and connect your DHCP server to that bridge. (Maybe the bridge can be left out, and just connect the DHCP server to the vlan interface, but I’m not sure).

3

It worked when I created the vlan and attached the dhcp server to it.

Thanks :slight_smile: