Update README.md

magma/README.md

@@ -17,7 +17,7 @@ This example requires a PNF, emulated with a VyOS router (image [here](http://os
 
 ## Launching the Slice
 
-1. Edit the params.yaml and set an address for your Magma Orc8r-proxy service, which AGW will connect to. Same IP address should go to 'proxyserviceloadBalancerIP' and 'orch_ip', and should belong to your K8 Cluster MetalLB pool.
+1. Edit the params.yaml and set an address for your Magma Orc8r-proxy service, which AGW will connect to. Same IP address should go to 'proxyserviceloadBalancerIP' and 'orch_ip', and should belong to your K8 Cluster MetalLB pool. Make sure you assign an IP address not being used in the target cluster (if using the ETSI K8sCluster at 172.21.248.18, an IP address between 172.21.250.150 and.199 should be available)
 1. In the same file, set a name and ID for the first AGW, in parameters agw_id and agw_name (they need to be different each time you launch a new slice)
 1. Launch the slice with:
 `osm nsi-create --nsi_name magma_slice --nst_name magma_slice_hackfest_nst --config_file params.yaml --ssh_keys <your_key> --vim_account <vim_account>`