Dell Force10 S4820T S4820T Configuration Guide - Page 908

www.dell.com | support.dell.com Deriving Interface Indices FTOS assigns an interface number to each (configured or unconfigured) physical and logical interface. Display the interface index number using the command show interface from EXEC Privilege mode, as shown in Figure 45-26. Figure 45-26. Display the Interface Index Number FTOS#show interface gig 1/21 GigabitEthernet 1/21 is up, line protocol is up Hardware is Force10Eth, address is 00:01:e8:0d:b7:4e Current address is 00:01:e8:0d:b7:4e Interface index is 72925242 [output omitted] The interface index is a binary number with bits that indicate the slot number, port number, interface type, and card type of the interface. FTOS converts this binary index number to decimal, and displays it in the output of the show interface command. Figure 45-27. Interface Index Binary Calculations 1 bit 1 bit 5 bits 7 bits 4 bits 14 bits Unused P/L Flag Slot Number Port Number Interface Type Card Type Starting from the least significant bit (LSB): • the first 14 bits represent the card type • the next 4 bits represent the interface type • the next 7 bits represent the port number • the next 5 bits represent the slot number • the next 1 bit is 0 for a physical interface and 1 for a logical interface • the next 1 bit is unused For example, the index 72925242 is 100010110001100000000111010 in binary. The binary interface index for GigabitEthernet 1/21 of a 48-port 10/100/1000Base-T line card with RJ-45 interface is shown in Figure 45-28. Notice that the physical/logical bit and the final, unused bit are not given. The interface is physical, so this must be represented by a 0 bit, and the unused bit is always 0. These two bits are not given because they are the most significant bits, and leading zeros are often omitted. 908 | Simple Network Management Protocol (SNMP)