Path Monitoring

Monitoring the availability of IP addresses

The icmp tracker service provides helpers to monitor the availability of IP addresses, using ICMP echo requests.

In the following example, the router has two links to reach the server: the main link and the backup link. Trackers can be used to monitor the availability of the server through both links, and configure static routing accordingly. An higher priority is assigned to the main link, using the distance parameter in the static routing context.

This can be configured as below:

vsr running config# / tracker
vsr running tracker# icmp main vrf main address 10.100.0.1 gateway 10.10.0.254 source 10.10.0.1
vsr running tracker# icmp backup vrf main address 10.100.0.1 gateway 10.20.0.254 source 10.20.0.1
vsr running tracker# / vrf main routing static
vsr running static# ipv4-route 10.100.0.0/16
vsr running ipv4-route 10.100.0.0/16#! next-hop 10.10.0.254 track main distance 1
vsr running ipv4-route 10.100.0.0/16# next-hop 10.20.0.254 track backup distance 2

To display the trackers state:

vsr running config# / tracker
vsr running tracker# show state
tracker
    icmp main address 10.100.0.1 vrf main source 10.10.0.1 gateway 10.10.0.254 period 500 threshold 1 total 1 discriminator 583249321 state down diagnostic timeout type icmp-echo
    icmp backup address 10.100.0.1 vrf main source 10.20.0.1 gateway 10.20.0.254 period 500 threshold 1 total 1 discriminator 489368122 state up diagnostic ok type icmp-echo
    ..

The same configuration can be made using this NETCONF XML configuration:

ubuntu1804 running config# show config xml
<config xmlns="urn:6wind:vrouter">
  <tracker xmlns="urn:6wind:vrouter/tracker">
    <icmp xmlns="urn:6wind:vrouter/tracker/icmp">
      <name>main</name>
      <vrf>main</vrf>
      <address>10.100.0.1</address>
      <gateway>10.10.0.254</gateway>
      <source>10.10.0.1</source>
      <period>500</period>
      <threshold>5</threshold>
      <total>10</total>
      <packet-size>100</packet-size>
      <packet-tos>192</packet-tos>
      <timeout>500</timeout>
    </icmp>
    <icmp xmlns="urn:6wind:vrouter/tracker/icmp">
      <name>backup</name>
      <vrf>main</vrf>
      <address>10.100.0.1</address>
      <gateway>10.20.0.254</gateway>
      <source>10.20.0.1</source>
      <period>500</period>
      <threshold>5</threshold>
      <total>10</total>
      <packet-size>100</packet-size>
      <packet-tos>192</packet-tos>
      <timeout>500</timeout>
    </icmp>
  </tracker>
  <vrf>
    <name>main</name>
    <routing xmlns="urn:6wind:vrouter/routing">
      <static>
        <ipv4-route>
          <destination>10.100.0.0/16</destination>
          <next-hop>
            <next-hop>10.10.0.254</next-hop>
            <track>main</track>
            <distance>1</distance>
          </next-hop>
          <next-hop>
            <next-hop>10.20.0.254</next-hop>
            <track>backup</track>
            <distance>2</distance>
          </next-hop>
        </ipv4-route>
      </static>
    </routing>
    <network-stack xmlns="urn:6wind:vrouter/system">
      <icmp/>
      <ipv4/>
      <ipv6/>
      <neighbor/>
      <conntrack/>
    </network-stack>
    <interface xmlns="urn:6wind:vrouter/interface"/>
    <logging xmlns="urn:6wind:vrouter/logging"/>
  </vrf>
</config>

See also

• The ICMP tracker commands reference.

• The static routing commands reference.

Monitoring the latency of IP addresses

The icmp-rtt tracker service provides helpers to monitor the latency of IP addresses, using ICMP echo requests.

This tracker will periodically send a set of ICMP echo requests in order to calculate minimal, maximal and average Round Trip Time (RTT) values in microseconds. It also provide a loss-ratio to notify about not received ICMP echo responses.

To configure an icmp-rtt tracker that will send 5 ICMP echo requests every 5 seconds:

vsr running config# / tracker
vsr running tracker# icmp-rtt rtt vrf main address 10.100.0.1 source 10.100.0.2 count 5 interval 5000

To display the trackers state:

vsr running config# / tracker
vsr running tracker# show state
tracker
    icmp-rtt rtt address 10.100.0.1 vrf main source 10.100.0.2 period 5000 count 5 timestamp "2023-09-25 17:55:40.742318" min-rtt 5866 max-rtt 5898 average-rtt 5883 loss-ratio 0
    ..