This article will discuss several methods to configure a full duplex link using Mikrotik RouterOS® software to control the link.

The first link we will discuss has the following advantages:

  1. It is full duplex (simulated)
  2. It will offer automatic failover in the event of a link failure (only one link - and losing this link will lose the full duplex "feel" of the link)
  3. It is VERY scalable

Use the following diagram as a reference:


The first scenario will be exactly as pictured. The four bridge radios can be ANY type of bridge device. They could be Mikrotik RB532 or RB112 with a single radio and configured as WDS bridged links or they could be 2 sets of Trango Tlink10s. For the purpose of this discussion, the bridges must be there, but what the specific equipment will only determine just how much bandwidth you will or will not have.

The basic idea is to create the links, then using OSPF path cost, cause the traffic from one side of the link to use link A and the traffic going the other way to use link B. If either link fails, the traffic will automatically failover and use the working link. I won't discuss the configuration of the bridge devices, but they must be true bridges. (MT with WDS will work just fine).

Once you have the links in place, you will plug Link A into Router A on ether1, Link B into Router A on ether2 and the LAN side of Router A will be on ether3. The other side (Router B) will be done the same way. To understand how to set up OSPF, refer to Mikrotik's documentation. The following config will go on Both routers:

/routing ospf network
add network=10.10.0.0/24 area=backbone
add network=10.10.1.0/24 area=backbone

Router A:

/routing ospf interface
add interface=ether1 cost=100

Router B:

/routing ospf interface
add interface=ether2 cost=100

This config will cause traffic from Router A lan side to use Link B (lower cost on ether2). Traffic from Router B will use Link A (lower cost on ether1). If either link fails, OSPF will automatically begin to use the working link.

If you wish, you can configure the same network using an RB532 with 2 wireless cards for Router A. The config is basically the same, except that what is shown as Bridge A and Bridge B would become wlan1 and wlan2. The configuration above would be changed appropriately (wlan1 = ether1).

An alternative method to accomplish a full duplex wireless link with Mikrotik is to use NStreme-dual. Details for how to set this up are HERE.

I hope this has been helpful. If you wish, I can assist with configuring this for you, but it really is very simple.



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