Hi Folks,
To add.. there are differences between instance type virtual-router and Logical System deployments.
With Logical System configuration the box will spin individual rpd daemon for every LS uniquely. Which is not the case with addition of routing-instance with type virtual-router in the box.
Few interesting content on logical-systems
https://www.juniper.net/documentation/en_US/junos12.1x46/topics/concept/logical-systems-overview.html
https://www.juniper.net/documentation/en_US/junos12.1x44/information-products/pathway-pages/security/security-logical-system-index.html
-A.Rengaramalingam