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B. SNMP MIBs and Traps, and RMON Alarm Defaults
B-12
September 2002 9128-A2-GB20-80
Physical Sublayer
(continued)
BRI
(Supported through
ifIndex – RFC 1573.)
ifIndex (RFC 1573)
ifAdminStatus
(RFC 1573)
ifOperStatus (RFC 1573)
devLastTrapString
(devHealthAndStatus.-
mib)
linkDown – One or more alarm
conditions are active on the
interface.
Strings:
‘$ifString down.’ No alarms
exist on the link.
‘$ifString administratively
shutdown.’ (Due to an
intentional shutdown.)
linkUp – No alarms on the
interface.
String:
‘$ifString up.’
Logical Link Sublayer
T1 Network,
BRI,
PRI,
Synchronous Data
Port
Service Side of the
Frame Relay UNI
(Supported by the
media-specific Frame
Relay Services MIB.)
ifIndex (RFC 1573)
ifAdminStatus (RFC
1573)
ifOperStatus (RFC 1573)
devLastTrapString
(devHealthAndStatus.-
mib)
linkDown – LMI is down for the
LMI Protocol configured,
3
or
Frame Relay link is disabled.
Strings:
‘$ifString down.’ No alarms
exist on the link due to LMI.
‘$ifString LMI down.’ No alarms
exist on the link. (e.g., ‘Sync
Data Port S01P1 frame relay
link “Port-1” LMI down.’)
‘$ifString administratively
shutdown.’ (Due to an
intentional shutdown.)
linkUp – LMI is up or Frame
Relay link is enabled.
String:
‘$ifString up.’
T1 Network,
BRI,
PRI,
Synchronous Data
Port
DTE Side of the Frame
Relay UNI
(Supported by the
media-specific Frame
Relay DTE’s MIB.)
ifIndex (RFC 1573)
ifAdminStatus (RFC
1573)
ifOperStatus (RFC 1573)
devLastTrapString
(devHealthAndStatus.-
mib)
linkDown – LMI is down for the
LMI Protocol configured,
3
or
Frame Relay link is disabled.
Strings:
‘$ifString LMI down.’
‘$ifString administratively
shutdown.’ (Due to an
intentional shutdown.)
linkUp – LMI is up or Frame
Relay link is enabled.
String:
‘$ifString up.’
Table B-6. linkUp and linkDown Variable-Bindings (2 of 2)
Interface Variable-Bindings Possible Cause
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.
3
If the LMI Protocol is not configured, a linkUp/linkDown trap is based solely upon
whether the interface is enabled or disabled.