What is Interface Lower layer down ? (562 Views)
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Respected Contributor
Bharath M R
Posts: 403
Registered: ‎03-10-2010
Message 1 of 3 (562 Views)

What is Interface Lower layer down ?

Hi ,

 

        Sorry for the basix question.

 

      In NNMi, some interfaces shows the status ""Lower Layer Down""  , somebody please explain the meaning !!

Thanks,
Bharath
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Honored Contributor
AndyKemp
Posts: 695
Registered: ‎05-17-2010
Message 2 of 3 (557 Views)

Re: What is Interface Lower layer down ?

It refers to OSI  model

 

Layer 1 physical layer- electrical voltage , radio frequency ,  photon pulses (ethernet, token ring, FDDI, SONET)

Layer 2 data link layer- MAC and logical link aka classical switching

Layer 3 network layer -  IP, IPX, ICMP

Layer 4 transport -  TCP, UDP

 

 

Meaning that what you're looking at has one of the lower numbered parts of the model not working    

Have a nice day :)

Andy Kemp,  CISSP
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Frequent Advisor
Akshay44
Posts: 48
Registered: ‎12-26-2000
Message 3 of 3 (311 Views)

Re: What is Interface Lower layer down ?

From: http://tools.ietf.org/search/rfc2863 Pg 18:

The lowerLayerDown state is also a refinement on the down state.
   This new state indicates that this interface runs "on top of" one or
   more other interfaces (see ifStackTable) and that this interface is
   down specifically because one or more of these lower-layer interfaces
   are down.
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