This is my first time to deal with EtherSwitch module, I have router Cisco CISCO2921/K9 and EtherSwitch module "SM-X-ES3-24-P: EtherSwitch SM L3" installed on it. I have many questions about how it does work:
1- If I want to create a routed interface (Layer 3 port), when I type "no switchport" command it says "command rejected, not allowed on this interface", Does that mean this switch not support Layer 3 feature? Hint: EtherSwitch license is lanbase and image is C3560E-UNIVERSALK9-M
2- from Router privilege mode I can't see switch interfaces status when I type "show ip interface brief", just shows the router's interfaces plus 2 extra Gi ports, and when entered switch privilege mode I see 26 ports instead of 24 ports, are those 2 ports have link to the extra 2 Gi ports on router?
3- Do I need to create VLAN id on both router and switch to have intra-connectivity between router and switch?, I mean I have subnets connected to other interfaces on the router and I want these subnets to reach other subnets created on the EtherSwitch, will it be direct connected automatically and no need to run routing protocol?
4- I have many branches will be connected to the router via EtherSwitch ports, How the WAN will be configered? , just create interface VLAN on Etherswitch and enable routing protocol on it and in the other side (branch) configure sub-interface with dotq1 encapsulation (if we assume ISP has connected our branches us through Layer 2 connectivity) or do you have a better solution (in case of L2 and L3 ISP backbone connection)?
Thank you.
