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SNMP Trap Has Different Source IP Address Than Configured On Switch

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TitleSNMP Trap Has Different Source IP Address Than Configured On Switch
Symptoms
  • SPB environment
  • SNMP source ip configured as vlan ip interface
  • Circuitless/loopback ip address configured and set as source ip for ISIS
  • Both force-iphdr-sender and force-trap-sender enabled
snmp-server force-iphdr-sender enable
snmp-server sender-ip 192.168.1.254 10.10.10.1
snmp-server force-trap-sender enable

interface loopback 1
ip address 1 10.100.100.1/255.255.255.255
exit

router isis
sys-name "VSP1"
ip-source-address 10.100.100.1
is-type l1
manual-area 11.2222 
exit
router isis enable

interface Vlan 10
ip address 10.10.10.1 255.255.255.0 0 
exit
  • SNMP traps arrive at trap receiver with source ip address of circuitless/loopback ip (10.100.100.1) instead of configured vlan ip (10.10.10.1)
Environment
  • VSP platform
  • All supported releases
Cause
Product functioning as designed
Resolution
  • Force-trap-sender parameter was designed to have SNMP trap packet use circuitless/loopback ip address as source IP address instead of some other IP address
  • If interface other than circuitless/loopback is used for SNMP trap source (such as VLAN IP, Brouter IP, etc) it will be ignored and simply uses circuitless/loopback interface configured on switch
  • For more information see page 2110 in VOSS Command Line Interface Commands Reference
Additional notes

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