Confirming a physical disconnection with SNMP

[Devake666]

Dear All,

In an upcoming project, i will need to know if a cable has be physically disconnected from the router. Are there any SNMP traps for this particular event? If I recieve a linkdown from IF-MIB and check if the value of cieIfOperStatusCause from CISCO-IF-EXTENSTION is linkfailure, will i be able to confirm that a cable has been disconnected phyiscally?

Thanks in advance.

Angus

[Devake666]

So there are no ways to do this with SNMP?

I have read the datasheets you provided.

I will be using SRE so i guess the ISR one will suit me better.

Can it be installed with SRE-V on the same SRE module?

Also, will it be possible to write a custom C/C++ application running on the SRE-V to recieve information from NAM?

Thank you for your help!

[Nael Mohammad]

Sorry for the previous reply, I was looking at the wrong screen. At any rate in regards to your primary questions about traps for physical disconnect. Do the following on the device:

snmp-server enable traps snmp linkup linkdown coldstart

This should notify you when the link is physically disconnected with a linkdown trap and when connected again with a linkup trap.

There is a known bug for older IOS trains that did not generate the linkdown trap when the cable was disconnected. The bug id is CSCsg24215 SNMP linkdown traps not generated in 12.2(33)SRA1.

-nael

[Devake666]

Does this trap specifically detect physical disconnections?? Are there any cases where linkdown trap will be thrown eventhough the cable was not physically disconnected?

[Nael Mohammad]

This trap will detect any linkup or linkdown triggers.