Dell Force10 E600i FTOS Version 8.4.1.5 Configuration Guide for ExaScale - Page 940

www.dell.com | support.dell.com Figure 51-1. 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 51-2. 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. Figure 51-2. Binary Representation of Interface Index 2 bits 7 bits 10 0010110 Slot Port Number Number 4 bits 0011 Interface Type 14 bits 00000000111010 Card Type For interface indexing, slot and port numbering begins with the binary one. If the Dell Force10 system begins slot and port numbering from 0, then the binary 1 represents slot and port 0. For example, the index number in Figure 51-2 gives the binary 2 for the slot number, though interface GigabitEthernet 1/21 belongs to Slot 1. This is because the port for this example is on an E-Series which begins numbering slots from 0. You must subtract 1 from the slot number 2, which yields 1, the correct slot number for interface 1/ 21. Note that the interface index does not change if the interface reloads or fails over. On the S-Series, if the unit is renumbered (for any reason) the interface index will change during a reload. 940 | Simple Network Management Protocol