Output from MIB 1.3.6.1.2.1.2.2.1.2, ICX7550

[Mats]

Questions:

Having two units in the stack, in output from snmpwalk query,

We get .x.x.IfDescr.1
Value = String   Gigabit Ethernet  1/1/1

further down in the output:

We get .x.x.IfDescr.257
Value = String   Gigabit Ethernet  2/1/1

Question is: Where is the reference to ifDescr.257, deriving from?

And what would the numbering be on same same interface, say 3/1/1, if we add another switch, into the stack? 

//Mats

[Chandini · Accepted solution]

Hi Mats

Thank you for reaching us. 

I had a example of a stack of three units model 7750 Switch series. The inDescr and ifIndex would be different for each port on the switch. 

Below is the example:

Stack Unit 1:

IF-MIB::ifDescr.1 = STRING: 10GigabitEthernet1/1/1

IF-MIB::ifDescr.2 = STRING: 10GigabitEthernet1/1/2

Stack Unit 2:

IF-MIB::ifDescr.257 = STRING: 10GigabitEthernet2/1/1

IF-MIB::ifDescr.258 = STRING: 10GigabitEthernet2/1/2

Stack Unit 3:

IF-MIB::ifDescr.513 = STRING: 10GigabitEthernet3/1/1

IF-MIB::ifDescr.514 = STRING: 10GigabitEthernet3/1/2

I suppose these number you view from IfDescr are associated to IfIndex which is interface index details a unique way of identifying number associated with a physical or logical interface. I suppose this varies based on vendor and could be coded or inbuild. 

I hope this help answer your question. 

Thanks 

[Mats]

Yes, it does, many thanks for the clarification.
(matches rfc2863 page 29)

rgds/Mats