06-08-2023 08:22 PM
Can we make sdwan does load balancing of traffic depending on the bandwidth of the channel?
if we have two isp's I would like sending traffic depends on channel bandwidth
1 ISP 100 mbit channel
2 ISP 200 mbit channel
06-08-2023 10:24 PM
Hello @dijix1990,
Yes, SD-WAN technology allows for intelligent and dynamic traffic management across multiple WAN links.
By leveraging SD-WAN controllers or orchestrators, you can configure policies and rules to monitor the bandwidth of each link and make dynamic routing decisions. The SD-WAN controller can continuously assess the available bandwidth of each ISP link and distribute the traffic accordingly, ensuring optimal utilization of the available resources.
06-09-2023 12:50 AM
It's good. Can you share guide or example?
06-09-2023 04:07 AM
Maybe this what you're looking for?
Regards,
M
06-09-2023 07:54 AM
I think this feature can help, but not shure
Just need to balance traffic between two wan operators with different bandwith to prevent dropes because of exceeding channel
06-09-2023 10:47 AM
Hi,
for overlay traffic you can use weight attribute for TLOC. Weight can be between 1-255 and affects both inbound and outbound traffic:
for DIA, I believe that it is purely ECMP based (depending on ip cef load-sharing algorithm) and weight will not help.
Unfortunately, this type of internals are not documented in detail. If you have TAC support, open case as question.
06-09-2023 10:53 AM
@dijix1990 you get answer from godfather of sd-wan in community @Kanan Huseynli
So I agree I read now sd-wan and it support ecmp only.
Thanks
MHM
06-09-2023 04:47 PM
Unfortunately, not for dia and a simple balance between channels, I mean a flexible balance between different channels with different widths
06-09-2023 04:44 PM
So, how can I understand that there is no special function for intelligent balancing, such as fortinet or vmware has, because the weight of @Kanan Huseynli's recommendation does not correspond to intelligent balancing, for example 1/3 or 2/1, or depending on the actual bandwidth of the channel, that is, sdwan does not determine that a 100 mbit wide channel can be sent more traffic than in a 50 mbit wide channel
06-10-2023 01:04 AM
I don't quite sure, at which level weight is intelligent, but you can use weight 1 for ISP1 (100Mbps), use weight 2 for ISP2 (200Mbps). Plus, better to use shaper additionally on these egress interfaces.
06-10-2023 02:18 AM
Yes I tried it yesterday. It works when bandwith is stable, but if we start decrease bandwidth through shaper or policer we get drops, because edge sends traffic despite shaper. I want to try this https://www.cisco.com/c/en/us/td/docs/routers/sdwan/configuration/qos/ios-xe-17/qos-book-xe/m-adaptive-qos.html. Thought that sdwan from cisco has simple policy for theese situations as sdwan from vmanage/fortinet, maybe it will be later
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