Configure NextHop Reachability Probe
Table of Contents
Configure NextHop Reachability Probe
Learn how to configure NextHop reachability probes in Prisma SD-WAN. The ION device
checks if the next hop configured on the static route is reachable when you enable the
NextHop Reachability Probe.
| Where Can I Use This? | What Do I Need? |
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The ION device checks if the next hop configured
on the static route is reachable when you enable the NextHop
Reachability Probe. To check if the next hop is reachable,
the ION device initiates ICMP probes every second and waits 100
ms for a reply from the next hop. Failure to receive 3 consecutive
ICMP responses causes the device to mark the next hop as unreachable
and the device removes the static route. As a result, the device
forwards traffic to the destination prefix via an alternate path
and does not drop traffic due to an unreachable next hop.
The
device decides the number of probes dynamically based on the next
hops. If multiple static routes have the same next hop, then the
device configures only one probe. If there are multiple next hops,
the device configures multiple probes.
Enable the NextHop
Reachability probe when configuring a static route.
- Select .Create or edit a static route and toggle the Next Hop Reachability Probe to True.You will not be able to enable the Next Hop Reachability probe if:
- The next hop is an interface on the ION device.
- If Self is True for the next hop.
- If recursive next hop is configured on a data center ION device.
To check the status of the NextHop Reachability Probe, click the ellipsis menu for a static route and then select Status.![]()
View the reachability status of the next hop along with the next hop address on the Nexthop Reachability Status screen.
