binding network interfaces

[poncenby smythe]

I have been googling for around ten minutes trying to find a howto  
for binding two interfaces together.
I vaguely remember doing this with linux which involved putting some  
bond statement in /etc/sysconfig/network-scripts/somefile.

The trunk command seems to do what I am looking for but I am slightly  
confused..

trunk(4):

Create a simple round robin trunk with two bge(4) Gigabit Ethernet  
interfaces:

           # ifconfig bge0 up
           # ifconfig bge1 up
           # ifconfig trunk0 trunkport bge0 trunkport bge1 \
                   192.168.1.1 netmask 255.255.255.0

i don't have a box to try this on at the moment so would trunk be  
suitable for an openbsd box which has the transmit traffic being  
spouted to em0 and receive traffic spouted to em1?
i guess it would be:

           # ifconfig em0 up
           # ifconfig em1 up
           # ifconfig trunk0 trunkport em0 trunkport em1 \
                   192.168.1.1 netmask 255.255.255.0

and what is a round-robin trunk?

thanks for any help and apologies for asking questions I could work  
out myself , I just don't have access to any openbsd at the moment.

poncenby