SNMP MIBs and Traps, and RMON Alarm Defaults
B-9
9664-A2-GB20-00
March 2000
Table B-6. linkUp and linkDown Variable-Bindings(1 of 2)
Interface
Variable-Bindings Possible Cause
Physical Sublayer
Network ISDN S/T
(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
interface.
The alarm condition for the
ISDN S/T interface is Loss of
Signal (LOS).
String:
‘$ifString $alarmString down.’
(e.g., ‘Network ISDN S/T
down due to LOS.’)
‘$ifString administratively
shutdown.’ (Due to an
intentional shutdown.)
H linkUp – No alarms on the
interface.
String:
‘$ifString up.’
User Synchronous
Data Port
(Supported by the
media-specific
RS232-like MIB.)
H ifIndex (RFC 1573)
H ifAdminStatus
(RFC 1573)
H ifOperStatus (RFC 1573)
H devLastTrapString
(devHealthAndStatus.-
mib)
H linkDown – One or more alarm
conditions are active on the
port.
Alarm conditions include:
– DTR off
1
– RTS off
1
– ‘’ – Not DTR or RTS, but
link is down.
String:
‘$ifString $alarmString down.’
(e.g., ‘Sync Data Port S01P1
DTR down.’)
‘$ifString administratively
shutdown.’ (Due to an
intentional shutdown.)
H linkUp – No alarms on the
port.
String:
‘$ifString up.’
1
This alarm condition only generates a linkUp/linkDown trap if the DTE supports
this lead state.
