User`s guide

B. Standards Compliance for SNMP Traps
7990-A2-GB20-00 May 2002
B-3
linkUp and linkDown
The link SNMP traps are:
linkUp
– The unit recognizes that one of the communication interfaces is
operational.
linkDown
– The unit recognizes that one of the communication interfaces is
not operational.
The network and synchronous port interfaces (physical sublayer) are represented
by an entry in the MIB-II Interfaces table and supported by the DS1 MIB.
Table B-4, linkUp/Down Variable Bindings, describes the conditions that define
linkUp and linkDown.
Table B-4. linkUp/Down Variable Bindings (1 of 2)
linkUp/Down variable bindings
ifIndex (RFC 2863 (was 1573))
This object provides the index into the ifTable and potentially into tables in other MIBs.
The ifIndexes supported are:
– 1COM Port
– 2DSL Network Interface
– 6G.703 Port
– 10EIA-530-A Port
– 14EOC Management Link
ifAdminStatus (RFC 2863)
This object specifies the operational state of the interface:
– up(1)
The interface is enabled.
– down(2)
The interface is disabled.
ifOperStatus (RFC 2863)
This object specifies the operational state of the interface:
– up(1)
COM Port: Always up unless defined as a Net Link, in which case status is
controlled by link layer protocol and control leads.
DSL Port: DSL link is established and no alarms exist.
G.703 Port: No alarm conditions exist.
EIA-530-A Port: Port is enabled and configured control leads are on.
EOC: Based on the state of the link layer protocol.
– down(2)
COM Port: Down status is controlled by link layer protocol and control leads.
DSL Port: DSL link is not established or alarms exist.
G.703 Port: Alarm condition exists.
EIA-530-A Port: Port is disabled or a configured control lead is off.
EOC: Based on the state of the link layer protocol.
– testing(3)
DSL, G.703, or EIA-530-A Port: A test is active on the port.
– dormant(5)
DSL Port: DSL link is negotiating.