Bond 5 t1 lines 3 providers

[Migreen]

Fun project here.  Looking to bond together 3 t1 lines from one provider non-managed already bonded by 3 physical lines, 1 t1 non managed, and 1 t1 from another managed router going straight to a switch.  All different providers.  What technology should I be investigating?  Using an ISR4351 and currently have a nim-2mft-t1/e1 and would need an expansion module for more lines unless I can upgrade to a nim-4mft-t1/e1 with different providers.  The ultimate endpoint will be going to a sd-wan mushroom box and have all internet/voice handled by that connection.  My initial thought would be have all the non-managed lines bonded by the ISR and then let the SD-WAN box handle managing the rest.  Any thoughts are appreciated and should I be looking out for anything with the multiple providers going to one card?

[Georg Pauwen]

Hello,

I am not sure how the SD-WAN mushroom box fits into your picture, but you can only 'bond' lines that go to the same provider (and even then you need your provider to mirror your multilink configuration on the ISP side). So, reading through what you are saying, you could 'bond' three of the five lines, and then use (unequal cost) load balancing to distribute traffic across all five lines (that typically is done with static routes)...

[Migreen]

Thank you for the response.  I've been dumped in the deep end a bit and this helps.  So I would bond those three t1s with the router, if the provider supports the multilink config.  The question then would be can the router merge the 4 t1s, 3 bonded and one independent, to output to one interface going to the SD-WAN box?  Would I need to use two interfaces to go out to the SD-WAN box?  Could all four t1s come in on a single t1 card or would I need a separate card for each provider?  Ultimately all the t1s would go to the mushroom and be balanced through that.  Then from there to the switch if I am understanding all of this correctly.  I think the complication for me here is the different providers going into a single router.