All MIBs › GANDALF-ENTERPRISE-MIB › gTopologyChange
gTopologyChange
Module: GANDALF-ENTERPRISE-MIB
OID (symbolic): GANDALF-ENTERPRISE-MIB::gTopologyChange
OID (numeric): 1.3.6.1.4.1.64.0.112
Node type: NOTIFICATION-TYPE
Description: A topologyChange trap is sent by a bridge when any of its configured ports transitions from the Learning state to the Forwarding state, or from the Forwarding state to the Blocking state. The trap is not sent if a newRoot trap is sent for the same transition.
Examples
Send this trap to an SNMP manager — replace <manager> with the IP or hostname of your monitoring server (SNMPv2c):
snmptrap -v2c -c public <manager> '' GANDALF-ENTERPRISE-MIB::gTopologyChange snmptrap -v2c -c public <manager> '' 1.3.6.1.4.1.64.0.112
Listen for incoming traps on the manager host (-f keeps it in the foreground, -Lo prints to stdout — useful for testing):
snmptrapd -f -Lo -c /dev/null authCommunity log public
Example snmptrapd log entry:
zoo11-linux.zoo [UDP: [192.168.30.111]:65364->[192.168.30.10]:162]: DISMAN-EVENT-MIB::sysUpTimeInstance = Timeticks: (300272980) 34 days, 18:05:29.80 SNMPv2-MIB::snmpTrapOID.0 = OID: GANDALF-ENTERPRISE-MIB::gTopologyChange
SNMPv3 example:
snmptrap -v3 -l authPriv -u snmpv3user -a SHA -A "AuthPass1" -x AES -X "PrivPass1" <manager> '' GANDALF-ENTERPRISE-MIB::gTopologyChange
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OID Breakdown
Upper-level ancestors (6 from the standard OID tree / other modules)
| Numeric OID | Name | Module |
|---|---|---|
| 1 | iso | LANART-AGENT |
| 1.3 | org | AirPair-MIB |
| 1.3.6 | dod | AirPair-MIB |
| 1.3.6.1 | internet | AirPair-MIB |
| 1.3.6.1.4 | private | AirPair-MIB |
| 1.3.6.1.4.1 | enterprises | AirPair-MIB |
| Numeric OID | Name | Module |
|---|---|---|
| 1.3.6.1.4.1.64 | gandalf | GANDALF-ENTERPRISE-MIB |
| 1.3.6.1.4.1.64.0.112 | gTopologyChange | GANDALF-ENTERPRISE-MIB |