An example of how to configure a path monitor.

1. Create a path monitor host named dc and configure the parameters for probe sessions to this host.

   vyatta@vyatta# set service path-monitor host dc target 1.1.1.1

   For a ping probe:

   vyatta@vyatta# set service path-monitor host dc type ping

   For a twping probe:

   vyatta@vyatta# set service path-monitor host dc type twping

2. Create a policy named voip and set the round trip time threshold to 5 ms and the tolerance to 10 ms.

   vyatta@vyatta# set service path-monitor policy voip requires type ping round-trip-time threshold 5

   vyatta@vyatta# set service path-monitor policy voip requires type ping round-trip-time tolerance 10
   

   When the average measured round trip time is at or below the 5 ms threshold, then the path complies with the voip policy.

   When the measured round trip time is more than 15 ms (5 ms threshold + 10 ms tolerance), then the path does not comply with the voip policy.

   If the path complies with a path monitor policy and the path monitor measures a round trip time that is more than 5 ms and less than 15 ms, then the monitor reports the state as Marginally Compliant.

3. Create the following associations:
   • A policy association between provider-a, a ping path monitor, and the voip policy
   • A ping association between provider-a and the dc host
   • A ping association between provider-a and the routing instance provider-a

   Note: A path monitor must have exactly one host and one or more SLA policies.

   vyatta@vyatta# set service path-monitor monitor provider-a policy voip

   vyatta@vyatta# set service path-monitor monitor provider-a type ping host dc

   vyatta@vyatta# set service path-monitor monitor provider-a type ping routing instance provider-a

4. Create similar associations for provider-b.

   vyatta@vyatta# set service path-monitor monitor provider-b policy voip
   

   vyatta@vyatta# set service path-monitor monitor provider-b type ping host dc

   vyatta@vyatta# set service path-monitor monitor provider-b type ping instance provider-b

5. Create similar associations for provider-c.

   vyatta@vyatta# set service path-monitor monitor provider-c policy voip

   vyatta@vyatta# set service path-monitor monitor provider-c type ping host dc

   vyatta@vyatta# set service path-monitor monitor provider-c type ping instance provider-c

6. Commit the configuration.

   vyatta@vyatta# commit [edit]

7. Optional: View the configuration.

   vyatta@vyatta# show service path-monitor monitor

   
   monitor provider-a {
           policy voip
           type {
                   ping {
                           host dc
                           interface dp0p161p1
                   }
           }
    }
    monitor provider-b {
           policy voip
           type {
                   ping {
                           host dc
                           interface dp0p224p1
                   }
           }
    }
    monitor provider-c {
           policy voip
           type {
                   ping {
                           host dc
                           interface dp0p256p1
                   }
           }
    }
   [edit]