Vlan reservation from provider

Question

Computer networks

      Good afternoon. Recently, the main provider had an unpleasant accident due to lightning, there were constant problems for about two weeks! Decided to make reservation Vlan'a.
      Now, a little on business in the city, we have a main office and 3 branches, which are combined into one local network. The branches are located in the industrial zone and there was not much choice of wired providers before, but now there are options! All communication of branches basically goes with the head office, through the provider's VLAN! It so happened that the network goes directly to the switch, that is, the topology is straight without NAT and gateway, we again decided to take Vlan from another wired provider at each point. Now a question! How it is better to make reservation of channels without altering a network in branches? Is it possible to make a reservation and doubling the bandwidth using Link aggregation on managed switches, that is, from each of the providers, a switch is plugged into the port and LACR is configured there on two ports, there is such a suspicion that it will not work normally if one of the VLANs falls off, but the switch will see the link, what the hell will happen! I look forward to advice and recommendations! Managed switches are used in branch offices and head office!
                              

Answer 1

Is it possible to make redundancy and doubling throughput using Link aggregation on managed switches

Never aggregate different links (including different providers). Especially when it comes to multipoint links.

Managed switches are used in branch offices and head office!

L2? Not L3? Sadly. It would be possible to raise the routing - safely and conveniently.
The only automatic redundancy option that I see in this scenario is to simply include the second provider in the general switching, i.e. to organize a ring on two providers. It's damn dangerous. Without enabling STP loop guard at all points, this cannot be done categorically. And before implementation, make sure that BPDUs successfully go from anywhere to anywhere.
But remember, the topology drawn above is absolutely disgusting. You can't live like that. Go to L3.

Answer 2

I understand correctly, the provider gives "physics", without the ip level? Have you tried spanning tree?

Answer 3

Hm. if you take what you draw, then:
2 providers everywhere in the offices, on the routers of all offices, which includes the provider (s) vlan (s), encryption of all traffic inside the vlan and OSPF configured, possibly by ACL, so that traffic does not went to all offices - the speed of the channel, for example.
Somehow I would do it.
In this case, you will have a full link each with each, or a star / ring, which will be very difficult to break if you include all offices in the full link - I won’t say your exact plans, but somewhere like that

Answer 4

Doubling can be done through LACP, let's say by src-dst-mac, but this is not quite a doubling, but a spread of frames across different links depending on the mac address of the sender or recipient (src-dst-mac). As a result, if one downloads, its maximum speed will be equal to the speed of the link through which the frame is currently going.
Scheme curve. It is necessary to leave her on L3. It is possible on bgp at first. And it's best to build your own ip mpls with the same bgp.

Answer 5

Switch to L3 now when the time is right (network restructuring). And inside - OSPF \ BGP
Do not lay the basis for a curved architecture.