B. SNMP MIBs and Traps, and RMON Alarm Defaults
B-12 September 2002 9128-A2-GB20-80
Physical Sublaye r
(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 DTEs 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

1The DTR alarm condition will only generate a linkUp/linkDown trap if the DTE
supports the DTR lead state.
2The RTS alarm condition w ill only generate a linkUp /linkDown trap if th e DTE
supports the RTS lead state.
3If the LMI Protocol is not configured, a linkUp/linkDown trap is based solely upon
whether the interface is enabled or disabled.