How to configure router on a stick on the CRS 326 ore another CRS3xx serie device.
I want to setup switch1-cpu but i can’t find it.
What is the correct configuration for that?
First of all: CRS3xx are switches with L3 functionality. That L3 functionality can be used for routing, but routing performance will be waaay below wire speed. And I personally would never use switch (with limited capacity routing) in a router-on-a-stick scenario.
CRS3xx don’t support switch-chip setup, it’s done using (nowadays) usual bridge stuff … so make all ports members of brige and bridge will offload vast majority of tasks to hardware in CRS3xx.
Bridge, as not very widely known, has split personality: one is a “switch-like” personality, and the other one is interface through which ROS can interact with traffic passing bridge. Much like switch-cpu port on low-end MT devices with switch chip. To create true router-on-a-stick, where router gets connected to rest of networks - both WAN and (multiple) LAN(s) -, it is necessary to use VLANs on he sole connected interface to distinguish between different networks. The one uses appropriate VLAN interfaces to allow router to interact with all networks involved.