What should a topology change notification look like? Link up/down traps include
enough information to tell what port changed. snmptrapd shows me:
2004-09-02 12:20:14 ipm [10.93.0.5]:
RFC1213-MIB::sysUpTime.0 = Timeticks: (17049392) 1 day, 23:21:33.92
SNMPv2-MIB::snmpTrapOID.0 = OID: IF-MIB::linkDown RFC1213-MIB::ifIndex =
INTEGER: 5 SNMPv2-MIB::snmpTrapEnterprise.0 = OID: NET-SNMP-TC::linux
so I can tell that port 5 disconnected. The MIB says
linkDown NOTIFICATION-TYPE
OBJECTS { ifIndex, ifAdminStatus, ifOperStatus }
...
which, if I read it right, says "include an ifIndex in your trap (to indicate which
interface when down)". But topologyChange says:
topologyChange NOTIFICATION-TYPE
-- OBJECTS { }
...
Are you supposed to infer which interface was affected from previous link up/down
traps? That seems strange. Am I missing something?
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