SD-WAN Routing, and SDWAN Any-Any Rules

[hillsitsupp]

Hi

We've been having spotty internet connectivity since adding a 4G interface ( a Teltonika device in pass-through mode) to the SD-WAN on our 200E running 7.2.10.

The three fibre interfaces in the SD-WAN are only running 20-30 % utilization generally, and the 4G is weighted as a last resort. The only traffic I see on the 4G is the SD-WAN SLA targets. The 4G does work well enough when I add a SD-WAN rule to force a device to use it.

I came across this post saying to not use any-any in SD-WAN rules, and not to use the SD-WAN interface as a default route in heterogenous environments.

We did have an any-any rule, that was an easy fix, but regarding the routing, would a zone consisting of 3 fibre connections with different ISPs and a single 4G connection be considered heterogenous? Should I instead be adding a default route for each SD-WAN zone member interface? I can't add multiple interfaces to a single default rule as per the above post.

[Toshi_Esumi]

It depends on the type/purpose of each link (3 x fibers and 4G).
As the KB is describing, if like 2 x fibers are for MPLS to connect to other locations, where on the other end there may not be proper internet path for the local subnets, and 1 x fiber and 4G are internet circuits, you should set the default route only to the 1 x fiber and 4G individually. Then segment those into two zones to have a MPLS zone and an Internet zone. Then you can set proper rules to steer specific traffic between member interfaces inside each zone/segment.

Toshi

[hillsitsupp]

The fibres are a mix of DHCP and PPPoE standard internet - no MPLS. So I was thinking they'd be homogenous in this context.

[Toshi_Esumi · Accepted solution]

It's not talking about the protocol how to pull the interface IP in this context. It's about the purpose. If all are for the internet, those are homogeneous, again, in this context. The differences would be latency and bandwidth.

Toshi

[hillsitsupp]

OK, then they're definitely be homogenous.

Yeah, the 4G performance is rubbish compared to the fibre connections. I can use the poor latency in the performance SLA  threshold to keep it unused except as a last resort.

Thanks Toshi :)