Reference Guide

Starting from the least significant bit (LSB) in the preceding figure:
● The first 14 bits represent the card type of a physical interface or the interface number of a logical interface.
● The next 4 bits represent the interface type.
● The next 12 bits represent the slot and port numbers.
● The next bit is 0 for a physical interface and 1 for a logical interface.
● The last next is unused.
The Slot-Port Number value is derived from the slotId and portId parameters as follows: slotPortNum = ((slotId +1) *
IFM_IFINDEX_MAX_PORTS_PER_SLOT + portId).
On the Z9500, the IFM_IFINDEX_MAX_PORTS_PER_SLOT value is 192 (10G). For backward compatibility, the
IFM_IFINDEX_MAX_PORTS_PER_SLOT value is 128 on other Dell Networking switches.
The slotId value is derived as follows: slotId = (slotPortNum / IFM_IFINDEX_MAX_PORTS_PER_SLOT) -1.
The portId value is derived as follows: portId = slotPortNum % IFM_IFINDEX_MAX_PORTS_PER_SLOT.
For example, the interface index 51528196 for the FortyGigE 0/4 port is 0000 0011 0001 0010 0100 0010 0000 0100 in binary
format as shown in the following figure.
In this example, if you start from the least significant bit on the right:
● The first 14 bits (00001000000010) identify a Z9500 line card.
● The next 4 bits (1001) identify a 40-Gigabit Ethernet interface.
● The next 12 bits (000011000100) identify slot 0 and port 4.
● The next bit (0) identifies a physical interface.
● The last bit is always 0, which means that it is unused.
NOTE: On the Z9500, the interface index does not change if the interface reloads or fails over.
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.
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
Simple Network Management Protocol (SNMP)
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