SNMP Traps and Informs
October 29, 2008 at 12:28 pm | In System Management | Leave a CommentIEWB-vol1-v5 Task 12.17:
Configure R4 to send traps and informs about link status (except Serial interfaces) to management stations.
R4: snmp-server enable traps snmp linkdown linkup snmp-server host 155.1.146.101 inform version 2c CISCO snmp-server host 155.1.146.100 CISCO ! interface Serial0/0 no snmp trap link-status ! interface Serial0/1 no snmp trap link-status
Verification
Rack1R4#sh snmp host Notification host: 155.1.146.101 udp-port: 162 type: inform user: CISCO security model: v2c Notification host: 155.1.146.100 udp-port: 162 type: trap user: CISCO security model: v1
Rack1R4#debug snmp packet SNMP packet debugging is on Rack1R4#c Enter configuration commands, one per line. End with CNTL/Z. Rack1R4(config)#int e0/0 Rack1R4(config-if)#shut Rack1R4(config-if)# *Apr 7 17:20:47.354: %LINK-5-CHANGED: Interface Ethernet0/0, changed state to administratively down *Apr 7 17:20:48.354: %LINEPROTO-5-UPDOWN: Line protocol on Interface Ethernet0/0, changed state to down *Apr 7 17:20:48.354: SNMP: Inform request, reqid 12, errstat 0, erridx 0 sysUpTime.0 = 1558882 snmpTrapOID.0 = snmpTraps.3 ifIndex.1 = 1 ifDescr.1 = Ethernet0/0 ifType.1 = 6 lifEntry.20.1 = administratively down *Apr 7 17:20:48.442: SNMP: Packet sent via UDP to 155.1.146.101.162 *Apr 7 17:20:48.442: SNMP: Queuing packet to 155.1.146.100 *Apr 7 17:20:48.442: SNMP: V1 Trap, ent snmpTraps, addr 155.1.45.4, gentrap 2, spectrap 0 ifIndex.1 = 1 ifDescr.1 = Ethernet0/0 ifType.1 = 6 lifEntry.20.1 = administratively down Rack1R4(config-if)# *Apr 7 17:20:48.694: SNMP: Packet sent via UDP to 155.1.146.100
SNMP agents can send Informs or Traps
Traps are messages alerting the SNMP manager to a condition on the network
Informs are traps that require ACK from SNMP manager. Inform are more reliable than Traps
The snmp-server host command is used in conjunction with the snmp-server enable command. Use the snmp-server enable command to specify which SNMP notifications are sent globally. For a host to receive most notifications, at least one snmp-server enable command and the snmp-server host command for that host must be enabled.
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