B. Standards Compliance for SNMP Traps7990-A2-GB20-20 September 2004 B-3linkUp and linkDownThe link SNMP traps are: linkUp – The unit recognizes that one of the communication interfaces isoperational. linkDown – The unit recognizes that one of the communication interfaces isnot operational.The network and synchronous port interfaces (physical sublayer) are representedby 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 definelinkUp 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:– 1 COM Port– 2 DSL Network Interface– 6 G.703 Port– 10 EIA-530-A Port 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 iscontrolled 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.– 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.– 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.
