SNMP MIBs and Traps, and RMON Alarm Defaults
B-10 9123-A2-GB20-10July 2000

Table B-6. linkUp and linkDown Variable-Bindings (2 of 2)

Interface Possible CauseVariable-Bindings

Physical Sublayer (cont’d)
Ethernet Port HifIndex (RFC 1573)
HifAdminStatus
(RFC 1573)
HifOperStatus (RFC 1573)
HdevLastTrapString
(devHealthAndStatus.-
mib)
HlinkDown – Communication is
not possible over the Ethernet
port.
Strings:
‘$ifString down.’
‘$ifString administratively
shutdown.’ (Due to an
intentional shutdown.)
HlinkUp – Communication on
the port is restored.
String:
‘$ifString up.’
Logical Link Sublayer
Synchronous
Data Port
Service Side of the
Frame Relay UNI
(Supported by the
media-specific Frame
Relay Services MIB.)
HifIndex (RFC 1573)
HifAdminStatus
(RFC 1573)
HifOperStatus (RFC 1573)
HdevLastTrapString
(devHealthAndStatus.-
mib)
HlinkDown – LMI is down for the
LMI Protocol configured,3 or
Frame Relay link is disabled.
‘$ifString LMI down.’ No
alarms exist on the link.
(e.g., ‘Sync Data Port S01P1
frame relay link “Port-1”
LMI down.’)
‘$ifString administratively
shutdown.’ (Due to an
intentional shutdown.)
HlinkUp – LMI is up or Frame
Relay link is enabled.
String:
‘$ifString up.’
Network
DTE Side of the
Frame Relay UNI
(Supported by the
media-specific Frame
Relay DTE’s MIB.)
HifIndex (RFC 1573)
HifAdminStatus
(RFC 1573)
HifOperStatus (RFC 1573)
HdevLastTrapString
(devHealthAndStatus.-
mib)
HlinkDown – 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.)
HlinkUp – LMI is up or Frame
Relay link is enabled.
String:
‘$ifString up.’
3If the LMI Protocol is not configured, a linkUp/linkDown trap is based solely upon
whether the interface is enabled or disabled.