I'm currently in the process of converting a ScreenOS configuration to a JunOS router and am a bit confused by the current configuration of two bridge groups on the old router. It's my understanding that bridge groups aim to bridge two or more interfaces as a physical bridge would. However, on the ScreenOS router, the two bridge groups only have one interface each.
Does having a bridge group with one interface serve any purpose, or can it be configured as a regular interface would? I've looked at the setup of both bgroups, and they are configured exactly the same way as the other interfaces on the router are. The only difference is that the interfaces sit under a bgroup, which to me appears to be redundant. If my understanding of this is skewed, please correct me - I'll admit that this is the first time I've had to work with bridge groups, and there seems to be little about them on the Internet for me to work with.