SD-WAN Custom performance classes

[guitb]

Hi everyone,

I'm trying to set up a custom performance class in Meraki SD-WAN and I'd like some clarification on the failover logic.

If I create a class with the following thresholds:

• Latency: >100ms

• Packet Loss: >5%

Will the traffic fail over to the secondary WAN link if either of these conditions are met, or do both conditions need to be exceeded at the same time to trigger the failover?

[alemabrahao]

The failover logic is triggered if any one of the conditions is met, not necessarily all at once.

Meraki SD-WAN

Meraki SD-WAN - Cisco Meraki Documentation

[RaphaelL]

Hi ,

Both conditions need to be exceeded at the same time to trigger the failover. 

https://documentation.meraki.com/MX/Firewall_and_Traffic_Shaping/MX_Load_Balancing_and_Flow_Preferen...

Performance classes can also be created to define a minimum performance standard. If these standards are not met, traffic will be routed through the alternative uplink.

Unless I'm mistaken that's how I understood the documentation

EDIT: I was wrong. See below.

[alemabrahao]

I already have a different understanding than yours based on this other document.

"This rule will evaluate the packet loss of established VPN tunnels and send flows matching the traffic filter out of the preferred uplink. If the loss, latency, or jitter thresholds in the "Web" performance rule are exceeded, traffic can fail over to tunnels on WAN2 (assuming they meet the configured performance criteria)."

https://documentation.meraki.com/Architectures_and_Best_Practices/Cisco_Meraki_Best_Practice_Design/...

[RaphaelL · Accepted solution]

Just did some hardcore testing. 

No failover as expected. WAN1 and WAN2 have less than 10ms latency and 0% loss.

Now , I have plugged a RPI in WAN2 , bridged the interfaces , added 100ms latency with tc.

Only met the first critieria of the Test custom performance class and the traffic did failover to WAN1.

TL;DR I was wrong, but nothing beats a real world test to prove me wrong !

[PhilipDAth]

I wish I could give you double-double kudos for going the extra mile.

[RaphaelL]

The real extra mile will be to request a documentation clarification😅