SNMP MIBs and Traps, and RMON Alarm Defaults
B-10 9820-A2-GB20-20June 2000

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

Interface Possible CauseVariable-Bindings

Physical Sublayer, continued
Ethernet Port HifIndex (RFC 1573)
HifAdminStatus
(RFC 1573)
HifOperStatus (RFC 1573)
HdevLastTrapString
(devHealthAndStatus.-
mib)
HlinkDown – Communications
are not possible on the port.
String:
‘Ethernet $alarmString down.’
HlinkUp – Communications are
now possible on the port.
String:
‘Ethernet up.’
Logical Link Sublayer
Frame Relay
(Supported by the
media-specific Frame
Relay Services MIB.)
HifIndex (RFC 1573)
HifAdminStatus
(RFC 1573)
HifOperStatus (RFC 1573)
HdevLastTrapString
(devHealthAndStatus.-
mib)
HlinkDown – LMI is down for
the LMI Protocol configured,
or Frame Relay link is
disabled.
If the LMI Protocol is not
configured, a linkUp/linkDown
trap is based solely upon
whether the interface is
enabled or disabled.
Strings:
‘$ifString down.’ No alarms
exist on the link due to LMI.
‘$ifString LMI down.’ No
alarms exist on the link
because LMI is down.
‘$ifString administratively
shutdown.’ (Due to an
intentional shutdown.)
HlinkUp – LMI is up or Frame
Relay link is enabled.
String:
‘$ifString up.’