Troubleshooting Tip: SD-WAN 'Update static route' behavior when 2 servers are configured on performance SLAs
| Description | This article describes the behavior of enabling the 'Update static route' when configured on performance SLAs with 2 servers. |
| Scope | FortiGate. |
| Solution | Use the below example with two servers configured under 'Google DNS':
If the first server (8.8.8.8) is unreachable to all the SD-WAN members, the SLA will start to probe the statistics of the second server. This will not make any routing changes as long as one of the configured servers is still alive and reachable to the SD-WAN member/s.
Command to verify the routes:
get router info routing-table details 8.8.8.8 or get router info routing-table all
The 'update static route' will only remove the static routes for an SD-WAN member/s that has failed to reach both servers or failed to meet the configured metrics.
For example: If server 1 is unreachable to all the SD-WAN members, it will then use server 2 statistics. If server 2 is only reachable using WAN1, then the static route using WAN2 will be removed. Command to verify the routes:
get router info routing-table details 8.8.8.8 or get router info routing-table all
Related article: Technical Tip: Bring other interfaces down when link monitor fails |
