Use the slot/adapter/port [.subinterface] format to identify Ethernet interfaces and subinterfaces.
In the E120 router, line module slots are numbered 0–5. In the E320 router, line module slots are numbered 0–5 and 11–16. For both routers, slots 6 and 7 are reserved for SRP modules; slots 8–10 are reserved for switch fabric modules (SFMs).
This identifier applies to the E120 and E320 routers only. In the software, adapter 0 identifies the right IOA bay (E120 router) and the upper IOA bay (E320 router); adapter 1 identifies the left IOA bay (E120 router) and the lower IOA bay (E320 router).
For information about installing line modules and IOAs in the E120 and E320 routers, see E120 and E320 Hardware Guide, Chapter 4, Installing Modules.