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SNMP MIBs and Traps, and RMON Alarm Defaults
B-9
9783-A2-GB20-00
July 2000
Table B-6. linkUp and linkDown Variable-Bindings (1 of 3)
Interface
Variable-Bindings Possible Cause
Physical Sublayer
Network
(Supported by an
entry in the MIB-II
interfaces table.)
H ifIndex (RFC 1573)
H ifAdminStatus
(RFC 1573)
H ifOperStatus (RFC 1573)
H devLastTrapString
(devHealthAndStatus.-
mib)
H linkDown – One or more alarm
conditions are active on the
interface.
Alarm conditions include:
– Loss of Signal (LOS)
– Loss of Frame (LOF)
– Loss of Link (LOL)
– Loss of Signal Quality
– LPR Events
Sample strings:
‘Network DSL down due to
LOS, LOF, and LOL.’
‘Network DSL down due to
Loss of Signal Quality.’
H linkUp – No alarms on the
interface.
String:
‘$ifString up.’
Synchronous
Data Port
(Supported by the
media-specific
RS232-like MIB.)
H ifIndex (RFC 1573)
H ifAdminStatus
(RFC 1573)
H ifOperStatus (RFC 1573)
H devLastTrapString
(devHealthAndStatus.-
mib)
H linkDown – One or more alarm
conditions are active on the
port.
Alarm conditions include:
– DTR off
1
– RTS off
2
– ‘’ – Not DTR or RTS, but
link is down.
String:
‘$ifString $alarmString down.’
(e.g., ‘Sync Data Port S01P1
DTR and RTS down.’)
‘$ifString administratively shut
down.’ (Due to an intentional
shutdown.)
H linkUp – No alarms on the
port.
String:
‘$ifString up.’
1
The DTR alarm condition will only generate a linkUp/linkDown trap if the DTE
supports the DTR lead state.
2
The RTS alarm condition will only generate a linkUp/linkDown trap if the DTE
supports the RTS lead state.