Juniper Real-Time Performance Monitoring (RPM)
Real-Time Performance Monitoring (RPM)
The Real-Time Performance Monitoring (RPM) feature in Junos OS is similar to IP SLA in Cisco IOS. The following configuration makes the device send ICMP echo request packets to a public IP address for monitoring purposes every 3 seconds. The lack of ICMP echo responses received triggers a Junos OS Event Policy configuration that deactivates the Default Static Route 0.0.0.0/0. The same way, once ICMP echo responses successfully resume from the Internet within a short time frame, the Default Static Route gets activated again.
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set routing-options static route 0.0.0.0/0 next-hop <ISP_IP_address>
set routing-options static route 8.8.8.8/32 next-hop <ISP_IP_address>
set system syslog file DAEMON-INFO-LOG daemon info
set system syslog file CHANGE-LOG change-log any
set services rpm probe PROBE-INTERNET test PROBE-TEST1 probe-type icmp-ping
set services rpm probe PROBE-INTERNET test PROBE-TEST1 target address 8.8.8.8
set services rpm probe PROBE-INTERNET test PROBE-TEST1 test-interval 3
set services rpm probe PROBE-INTERNET test PROBE-TEST1 source-address <ISP_IP_address>
set services rpm probe PROBE-INTERNET test PROBE-TEST1 history-size 512
set services rpm probe PROBE-INTERNET test PROBE-TEST1 thresholds successive-loss 5
set event-options policy DISABLE-ON-PROBE-INTERNET-FAILURE events ping_test_failed
set event-options policy DISABLE-ON-PROBE-INTERNET-FAILURE events ping_probe_failed
set event-options policy DISABLE-ON-PROBE-INTERNET-FAILURE within 30 trigger until
set event-options policy DISABLE-ON-PROBE-INTERNET-FAILURE within 30 trigger 4
set event-options policy DISABLE-ON-PROBE-INTERNET-FAILURE within 25 trigger on
set event-options policy DISABLE-ON-PROBE-INTERNET-FAILURE within 25 trigger 3
set event-options policy DISABLE-ON-PROBE-INTERNET-FAILURE attributes-match ping_test_failed.test-owner matches PROBE-INTERNET
set event-options policy DISABLE-ON-PROBE-INTERNET-FAILURE attributes-match ping_test_failed.test-name matches PROBE-TEST1
set event-options policy DISABLE-ON-PROBE-INTERNET-FAILURE then change-configuration commands "deactivate routing-options static route 0.0.0.0/0"
set event-options policy DISABLE-ON-PROBE-INTERNET-FAILURE then change-configuration commit-options log "updating configuration from event policy DISABLE-ON-PROBE-INTERNET-FAILURE"
set event-options policy ENABLE-ON-PROBE-INTERNET-SUCCESS events ping_test_completed
set event-options policy ENABLE-ON-PROBE-INTERNET-SUCCESS within 20 trigger on
set event-options policy ENABLE-ON-PROBE-INTERNET-SUCCESS within 20 trigger 3
set event-options policy ENABLE-ON-PROBE-INTERNET-SUCCESS within 25 trigger until
set event-options policy ENABLE-ON-PROBE-INTERNET-SUCCESS within 25 trigger 4
set event-options policy ENABLE-ON-PROBE-INTERNET-SUCCESS attributes-match ping_test_completed.test-owner matches PROBE-INTERNET
set event-options policy ENABLE-ON-PROBE-INTERNET-SUCCESS attributes-match ping_test_completed.test-name matches PROBE-TEST1
set event-options policy ENABLE-ON-PROBE-INTERNET-SUCCESS then change-configuration commands "activate routing-options static route 0.0.0.0/0"
set event-options policy ENABLE-ON-PROBE-INTERNET-SUCCESS then change-configuration commit-options log "updating configuration from event policy ENABLE-ON-PROBE-INTERNET-SUCCESS"
Failover testing
Failover can be tested by removing and re-adding the /32 Static Route.
When executing the “simulate WAN outage” configuration lines, we should see the Default Static Route being removed from the Routing Table after a few seconds. Likewise, once the configuration lines “recover from WAN outage” are run, the Default Static Route should be restored.
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# simulate WAN outage
delete routing-options static route 8.8.8.8/32 next-hop <ISP_IP_address>
set routing-options static route 8.8.8.8/32 discard
commit
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# recover from WAN outage
delete routing-options static route 8.8.8.8/32 discard
set routing-options static route 8.8.8.8/32 next-hop <ISP_IP_address>
commit
Troubleshooting commands
Display the Default Static Route is on the Routing Table if available
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show route 0.0.0.0/0 exact
Monitor for the success or failure of a receiving ICMP echo reply. Up to 512 attempts can be stored in the history which is the max value allowed in the configuration
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show services rpm history-results owner PROBE-INTERNET
Stored in a log file, a long history of successful and failed attempts to get ICMP echo replies. IMPORTANT log lines are abbreviated in the logs
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show log DAEMON-INFO-LOG | match PING_TEST
Stored in a log file, this display the root account deactivating or activating the Default Static route when the event policy is triggered
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show log CHANGE-LOG | no-more | match root
Similar to the previous one, we should see the message “updating configuration from event policy DISABLE-ON-PROBE-INTERNET-FAILURE” or “updating configuration from event policy ENABLE-ON-PROBE-INTERNET-SUCCESS” based on the configuration
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show log messages | match "while executing policy"
Shows the configuration of RPM and the Event Policy in Junos OS.
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show configuration | display set | match PROBE-INTERNET