Hi Carl,
Below are the steps to configure back end network which is glusternw.
1) create a new network called 'glusternw'
2) Now go to clusters tab and select Logical networks tab.
3) You should see the newly created network there.
4) select the network and click on 'Manage Networks'
5) In Manage networks window for the newly created network select both 'Migration' & glusternw and click ok.
6) Now go to the hosts tab click on one host and select 'Network Interfaces' tab.
7) select the interface to which you would like to assign the backend network, drag and drop glusternw to that interface and click ok
8) You will see that network is now out of sync.
9) Please click refresh capabilities which will bring the network online.
Hope this helps !!
Thanks
kasturi