Varnish - multiple backends for one site

Is possible with Varnish configure multiple backends for one site? For example I have high avalibility site with multiple backends. For example I have site www.goodies.com which is running on php 5.6. So I have 3 www-nodes as backend www-node5.6a www-node5.6b www-node5.6c I have configured backends in Varnish like this: backend www-node5.6a { .host = "10.0.0.11"; .port = "80"; .connect_timeout = 6000s; .first_byte_timeout = 6000s; .between_bytes_timeout = 6000s; } backend www-node5.6b { .host = "10.0.0.12"; .port = "80"; .connect_timeout = 6000s; .first_byte_timeout = 6000s; .between_bytes_timeout = 6000s; } backend www-node5.6c { .host = "10.0.0.13"; .port = "80"; .connect_timeout = 6000s; .first_byte_timeout = 6000s; .between_bytes_timeout = 6000s; } my question is, how to configure Varnish so user will be randomly use to any of this backends for this specific one site?