C. MIB SupportC-16 July 2002 4800-A2-GB20-10ifIndexThe ifIndex identifies an interface. It is encoded as a 10-digit decimal number inthe form of:Where:— RR – Is a reserved area implied to be 0— CC – Is the chassis number in the range of 0–99— SS – Is a slot number (always 00, denoting Not Applicable)— L – Is a layer number in the range of 0–9— PPP – Is a port number in the range of 0–999See Table C-12, Layer and Port/Interface Number Assignments. Zero in any fielddenotes that it is not applicable.R R C C S S L P P PTable C-12. Layer and Port/Interface Number AssignmentsInt/Ext Interface Layer (L) Port/Interface (PPP)External Console Port 0 50External Modem Port 0 51External Ethernet Management Port 1 60External Ethernet Downlink Port 1 61External Ethernet Uplink Port 1 62External Ethernet/PPP Layer 2 Uplink Port (V.35/X.21 port) 1 70External PPP Uplink HDLC Interface (V.35/X.21 port) 2 70External PPP Uplink PPP Interface (V.35/X.21 port) 3 70Internal Uplink Processor Ethernet Interface (V.35/X.21 port) 1 80Internal Layer 2 Switch PPP Uplink Processor Ethernet Interface(V.35/X.21 port)1 81External ADSL Ports 1 1–48External ATM Interfaces 2 1–48External Port Processor Ethernet Interfaces 3 1–48Internal Port Processor L2 Switch Ethernet Interfaces 1 91–96Internal L2 Switch Port Processor Ethernet Interfaces 1 101–106Internal Management Processor L2 Switch Ethernet Interface 1 110Internal L2 Switch Management Processor Ethernet Interface 1 111