Command to add trusted nodes to config
This is how I configure the node to use these "trusted nodes". I added the command to open up to 500 connections which can be left out of course:
./tezos-node config update \
Behind the known DNS addresses are several individual IPs with the nodes. Therefore you should use dig (from package dnsutils on debian) to connect to all of them.
When running a node in private mode, you also need to trust the address first.
Also it might be a good idea to put these nodes into your default config. See the commented alternative line.