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B. SNMP MIBs, Traps, and RMON Alarm Defaults
9700-A2-GB20-20 December 2002 B-9
Physical Sublayer
(continued)
Synchronous
Data Port
(Supported by the
media-specific
RS232-like MIB.)
ifIndex (RFC 1573)
ifAdminStatus (RFC 1573)
ifOperStatus (RFC 1573)
devLastTrapString
(devHealthAndStatus.mib)
linkDown – One or more alarm
conditions are active on the
port. Alarm conditions include:
–DTR off.
The DTR alarm
condition will only generate
a linkUp/linkDown trap if the
DTE supports the DTR lead
state.
– RTS off. The RTS alarm
condition will only generate
a linkUp/linkDown trap if the
DTE supports the RTS lead
state.
– Not DTR or RTS, but link is
down.
Strings:
‘$ifString $alarmString down.’
(e.g., `Sync Data Port S01P1
DTR and RTS down.’)
‘$ifString administratively shut
down.’ (Due to an intentional
shutdown.)
linkUp – No alarms on the port.
String:
‘$ifString up.’
Ethernet Port
(Supported by an
entry in the MIB-II
Interfaces Table.)
ifIndex (RFC 1573)
ifAdminStatus (RFC 1573)
ifOperStatus (RFC 1573)
devLastTrapString
(devHealthAndStatus.mib)
linkDown – Communication is
not possible over the Ethernet
port.
– Loss of Signal (LOS)
– Loss of Frame (LOF)
– Loss of Link (LOL)
– Loss of Signal Quality
– LPR Events
Strings:
‘$ifString down.’
‘$ifString administratively shut
down.’ (Due to an intentional
shutdown.)
linkUp – Communication on the
Ethernet port is restored.
String:
‘$ifString up.’
Table B-6. linkUp and linkDown Variable-Bindings (2 of 3)
Interface Variable-Bindings Possible Cause