title: linkDown SNMP trap not having the required varbinds
body: <p>There are 2 types of linkDown alarm</p>
  
  <p>linkDown (CISCO-GENERAL-TRAPS) 1.3.6.1.2.1.11.0.2 
  linkDown (IF-MIB) 1.3.6.1.6.3.1.1.5.3</p>
  
  <p>linkDown from CISCO-GENERAL-TRAPS mib contains the below varbinds
  1.ifIndex 
  2.ifDescr 
  3.ifType 
  4.locIfReason </p>
  
  <p>linkDown from If-MIB mib contains the below varbinds
  1.ifIndex 
  2.ifAdminStatus 
  3.ifOperStatus</p>
  
  <p>But the linkDown that I received from ME1200 devices has the below varbinds
  1.IfIndex
  2.IfDesc
  3.IfType
  <strong>4.lifTable</strong>
  ,Since the SNMP trap doesn't contain either of locIfReason and IfAdminStatus, I couldn't process this linkDown trap.
  The lifTable varbind contains the Admin Status related information, but my question is <strong>why either of locIfReason and IfAdminStatus varbind is not available?</strong>. <strong>How to get the IfAdminStatus varbind from the device?</strong></p>