Users Guide

• 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 44634369 is 10101010010001000100000001 in binary. The binary interface index
for TenGigabitEthernet 0/41 of an Aggregator. 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.
For interface indexing, slot and port numbering begins with binary one. If the Dell Networking system
begins slot and port numbering from 0, binary 1 represents slot and port 0. In S4810, the first interface is
0/0, but in the Aggregator the first interface is 0/1. Hence, in the Aggregator 0/0s Ifindex is unused and
Ifindex creation logic is not changed. Because Zero is reserved for logical interfaces, it starts from 1. For
the first interface, port number is set to 1. Adding it causes an increment by 1 for the next interfaces, so it
only starts from 2.Therefore, the port number is set to 42 for 0/41.
Example of Deriving the Interface Index Number
Dell#show interface tengig 1/21
TenGigabitEthernet 1/21 is up, line protocol is up
Hardware is Dell Force10Eth, address is 00:01:e8:0d:b7:4e
Current address is 00:01:e8:0d:b7:4e
Interface index is 72925242
[output omitted]
Monitor Port-Channels
To check the status of a Layer 2 port-channel, use f10LinkAggMib (.1.3.6.1.4.1.6027.3.2). In the following
example, Po 1 is a switchport and Po 2 is in Layer 3 mode.
NOTE: The interface index does not change if the interface reloads or fails over. If the unit is
renumbered (for any reason) the interface index changes during a reload.
Example of SNMP Trap for Monitored Port-Channels
[senthilnathan@lithium ~]$ snmpwalk -v 2c -c public 10.11.1.1 .
1.3.6.1.4.1.6027.3.2.1.1
SNMPv2-SMI::enterprises.6027.3.2.1.1.1.1.1.1 = INTEGER: 1
SNMPv2-SMI::enterprises.6027.3.2.1.1.1.1.1.2 = INTEGER: 2
SNMPv2-SMI::enterprises.6027.3.2.1.1.1.1.2.1 = Hex-STRING: 00 01 E8 13 A5 C7
SNMPv2-SMI::enterprises.6027.3.2.1.1.1.1.2.2 = Hex-STRING: 00 01 E8 13 A5 C8
SNMPv2-SMI::enterprises.6027.3.2.1.1.1.1.3.1 = INTEGER: 1107755009
SNMPv2-SMI::enterprises.6027.3.2.1.1.1.1.3.2 = INTEGER: 1107755010
SNMPv2-SMI::enterprises.6027.3.2.1.1.1.1.4.1 = INTEGER: 1
SNMPv2-SMI::enterprises.6027.3.2.1.1.1.1.4.2 = INTEGER: 1
SNMPv2-SMI::enterprises.6027.3.2.1.1.1.1.5.1 = Hex-STRING: 00 00
SNMPv2-SMI::enterprises.6027.3.2.1.1.1.1.5.2 = Hex-STRING: 00 00
SNMPv2-SMI::enterprises.6027.3.2.1.1.1.1.6.1 = STRING: "Tengig 0/4 "
<< Channel
member for Po1
SNMPv2-SMI::enterprises.6027.3.2.1.1.1.1.6.2 = STRING: "Tengig 0/5 " << Channel
member for Po2
dot3aCommonAggFdbIndex
SNMPv2-SMI::enterprises.6027.3.2.1.1.6.1.1.1107755009.1 = INTEGER: 1107755009
dot3aCommonAggFdbVlanId
216
Simple Network Management Protocol (SNMP)