Service Manual

Deriving Interface Indices
Dell Networking OS assigns an interface number to each (congured or uncongured) physical and logical interface.
The interface index is a binary number with bits that indicate the slot number, port number, interface type, and card type of the
interface. Dell Networking OS converts this binary index number to decimal, and displays it in the output of the
show interface
command.
Starting from the least signicant bit (LSB):
• the rst 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 TeGigabitEthernet 1/21
of a 48-port 10/100/1000Base-T line card with RJ-45 interface. Notice that the physical/logical bit and the nal, unused bit are not
given. The interface is physical, so represent this type of interface by a 0 bit, and the unused bit is always 0. These 2 bits are not
given because they are the most signicant bits, and leading zeros are often omitted.
To display the interface number, use the following command.
• Display the interface index number.
EXEC Privilege mode
show interface
Example of Deriving the Interface Index Number
To view the system image on Flash Partition A, use the chSysSwInPartitionAImgVers object or, to view the system image on Flash
Partition B, use the chSysSwInPartitionBImgVers object.
Table 75. MIB Objects for Viewing the System Image on Flash Partitions
MIB Object OID Description MIB
chSysSwInPartitionAImgVers 1.3.6.1.4.1.6027.3.10.1.2.8.1.11 List the version string of the
system image in Flash Partition
A.
Chassis MIB
chSysSwInPartitionBImgVers 1.3.6.1.4.1.6027.3.10.1.2.8.1.12 List the version string of the
system image in Flash Partition
B.
Chassis MIB
The system image can also be retrieved by performing an SNMP walk on the following OID: MIB Object is chSysSwModuleTable and
the OID is 1.3.6.1.4.1.6027.3.10.1.2.8.
Dell#show interface Tengigabitethernet 1/21/1
TenGigabitEthernet 1/21/1 is up, line protocol is up
Simple Network Management Protocol (SNMP)
745