MikroTik

Posted: **Fri Oct 10, 2008 11:23 pm**

I'm trying to do some vlaning, but my two ROS boards are not communicating.

The network is set up as such:

RB112 <- cat5 -> Cisco 3550 <- Fiber optic -> Cisco 6509 <- fiber optic -> Cisco 3550 <- cat5 -> RB112

I have two VLANs of concern. ID's 200 and 84. 200 is untagged and 84 is tagged.

I have configured the Cisco 3550's as such:

interface FastEthernet0/24
 switchport trunk encapsulation dot1q
 switchport trunk native vlan 200
 switchport trunk allowed vlan 84,200
 switchport mode trunk
 no ip address
!

I have verified that both vlans are being broadcast on the port:

Vlan             Role Sts Cost      Prio.Nbr Type
---------------- ---- --- --------- -------- --------------------------------
VLAN0084         Desg FWD 19        128.24   P2p 
VLAN0200         Desg FWD 19        128.24   P2p

Both RB112 boards are running ROS 2.9.45

Interface configuration on both routers is identical:

/ interface vlan add name="vlan1" mtu=1500 arp=enabled vlan-id=84 interface=ether1 comment="" disabled=no 
/ interface ethernet set ether1 name="ether1" mtu=1500 mac-address=00:0C:42:0B:05:68 arp=enabled disable-running-check=yes auto-negotiation=yes full-duplex=yes cable-settings=default speed=100Mbps comment="" disabled=no

With IP addresses in the same subnet assigned to interface "vlan1" on both RB112 boards, neither router can ping the other. IP addresses in the same subnet assigned to ether1 work normally.

I can only assume that I'm doing something wrong. Any advice appreciated!

Thanks in advance

Posted: **Tue Oct 21, 2008 12:48 am**

Any thoughts? Anybody?

Posted: **Tue Oct 21, 2008 8:17 pm**

Can you assign an IP address on vlan 84 on one of the directly connected 3550s.

It might also be possible that the RB112 doesn't support VLANs (I know in Linux some chipsets don't). I have vlans working just fine with a cisco 2950 and an RB433 LV4.

You can also check the spanning tree on the cisco switch to make sure both vlans are forwarding all the way through the network on all the ports in question.

Posted: **Wed Jul 01, 2009 8:57 pm**

I never followed up with the solution on this.

The problem was in the configuration of the 6509 switch in the middle. The RB configuration posted above worked fine.

For reference of anybody trying to do anything like this, I would like to note that you MUST use WDS to pass VLAN tags!

For example,

RB <- wireless link -> rb <-ethernet link -> cisco device (or whatever)

The wireless link MUST be some flavor of WDS!

I don't understand why, but it's the ONLY way it will work.

Posted: **Wed Jul 01, 2009 9:08 pm**

per RFC.! ONly way to bridge a wireless connection per RFC is via WDS!

Posted: **Wed Jul 01, 2009 9:26 pm**

per RFC.! ONly way to bridge a wireless connection per RFC is via WDS!

Even if you want to ROUTE it, you have to use WDS.

Posted: **Wed Jul 01, 2009 9:34 pm**

You can just run IPs on the interfaces with AP bridge and station mode.. NO need for WDS in that aspect.

MikroTik

VLAN Configuration when attached to Cisco

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