Paradyne CSU, DSU, 9126-II, 9128-II manual Bri, Logical Link Sublayer

B. SNMP MIBs and Traps, and RMON Alarm Defaults

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

Interface	Variable-Bindings	Possible Cause
Physical Sublayer (continued)
BRI	ifIndex (RFC 1573)	linkDown – One or more alarm
	ifAdminStatus	conditions are active on the
		interface.
(Supported through	(RFC 1573)
		Strings:
ifIndex – RFC 1573.)	TifOperStatus (RFC 1573)
		‘$ifString down.’ No alarms
	devLastTrapString	exist on the link.
		‘$ifString administratively
	(devHealthAndStatus.-
	mib)	Tshutdown.’ (Due to an
		intentional shutdown.)
		linkUp – No alarms on the
		interface.
		String:
		‘$ifString up.’
Logical Link Sublayer
T1 Network,	ifIndex (RFC 1573)	linkDown – LMI is down for the
BRI,	ifAdminStatus (RFC	LMI Protocol configured,3 or
PRI,		Frame Relay link is disabled.
	1573)
Synchronous Data		Strings:
Port	TifOperStatus (RFC 1573)
		‘$ifString down.’ No alarms
	devLastTrapString	exist on the link due to LMI.
Service Side of the		‘$ifString LMI down.’ No alarms
	(devHealthAndStatus.-
Frame Relay UNI	mib)	exist on the link. (e.g., ‘Sync
(Supported by the		Data Port S01P1 frame relay
		link “Port-1” LMI down.’ )
media-specific Frame
		‘$ifString administratively
Relay Services MIB.)
		shutdown.’ (Due to an
		intentional shutdown.)
		linkUp – LMI is up or Frame
		Relay link is enabled.
		String:
		‘$ifString up.’
T1 Network,	ifIndex (RFC 1573)	TlinkDown – LMI is down for the
BRI,	ifAdminStatus (RFC	LMI Protocol configured,3 or
PRI,		Frame Relay link is disabled.
	1573)
Synchronous Data		Strings:
Port	TifOperStatus (RFC 1573)
		‘$ifString LMI down.’
	devLastTrapString	‘$ifString administratively
DTE Side of the Frame	(devHealthAndStatus.-	shutdown.’ (Due to an
Relay UNI	mib)	Tintentional shutdown.)
(Supported by the		linkUp – LMI is up or Frame
media-specific Frame		Relay link is enabled.
Relay DTE’s MIB.)		String:
		‘$ifString up.’

1The DTR alarm condition will only generate a linkUp/linkDown trap if the DTE supports the DTR lead state.

2The RTS alarm condition will only generate a linkUp/linkDown trap if the 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.

B-12 September 2002 9128-A2-GB20-80