4. Maintenance4-12 February 2001 3160-A2-GB21-90If two alarm conditions are detected at once, the higher priority alarm is reported.However, if an even higher priority alarm is detected before the first alarm iscleared, the later alarm is not reported. (The alarms listed above are in priorityorder with the highest priority listed first.)Alarms remain active until the alarm condition is cleared. Also, an alarm clearmessage is only sent when there are no other alarms active.For information about alarm configuration options, refer toAlarm ConfigurationOptions in Appendix C,Configuration Options.For troubleshooting information, refer toTroubleshooting on page 4-14.SNMP TrapsSNMP traps are unsolicited messages that are sent from the DSU/CSU to anSNMP manager when the DSU/CSU detects certain pre-specified conditions.These traps enable the SNMP manager to monitor the state of the network.The SNMP Trap configuration option must be enabled for trap messages to besent over the communications link. You must specify the number of SNMPmanagers that are to receive traps from this DSU/CSU, an IP address for eachSNMP manager specified, and the type of traps to be sent from this DSU/CSU. Formore information, refer to Appendix C,Configuration Options, andConfiguringSNMP Traps in Chapter 3,Operation.Trap types consist of the following: General traps – Include warmStart and authenticationFailure. The DSU/CSUsends a warmStart trap after it has been reset to indicate that it has justreinitialized itself. The DSU/CSU sends an authenticationFailure trap when ithas received an SNMP protocol message that has not been properlyauthenticated. These traps are set by the Gen Trap configuration option. Enterprise Specific traps – Signify that the DSU/CSU has recognized anenterprise-specific event. See Table 4-4, Enterprise-Specific Trap Definitions,for enterprise-specific traps. These traps are set by the Entp Trap configurationoption. Link Traps – Identify the condition of the communications interface, eitherlinkDown (one of the communications interfaces has failed) or linkUp (one ofthe communications interfaces has just come up). These traps are set by theLink Trap configuration option. The communications interfaces for which thesetraps can be generated are specified by the Trap I/F configuration option.Table 4-5, SNMP Trap per Interface, defines traps for each interface.
