Acronyms

• Forwarding and Feature Manager (FFM)
• Forwarding Engine Driver (FED)
• Embedded Services Processor (ESP)
• Route Processor Cards(RPC)
• Share interface processor(SIP)
• Forwarding engine control plan (FECP)
• Input Output Control processor (IOCP)
• share port adaptor (SPA)
• Control plane processor (CPP)
• Route Processor (RP)
• Line Card (LC) 
• SIP source IP 
• DIP Destination IP
• LER --label edge router. A router that performs label imposition.
• LFIB --label forwarding information base. The data structure used by switching functions to switch labeled packets.
• LIB --label information base. A database used by a label switch router (LSR) to store labels learned from other LSRs, as well as labels assigned by the local LSR. 
• Equal-Cost Multi-Path (ECMP)
  MLS multilayer switches