My organization has internet service through the same ISP, but with two separate physical circuits. We are doing BGP with them and having them route our Class B such that one portion is routed through circuit 1 and another is routed through circuit 2.
For example, 220.127.116.11/19 is announced to the ISP via circuit #1 and 18.104.22.168/19 is announced via circuit #2. They take care of announcing the entire 22.214.171.124/16 to the rest of the internet.
My question - can this same thing be done if circuit #2 was with a second ISP? Even though it is a Class B (of which we own the entire block), can two providers announce separate /19 subnets of it?
Typically the minimum size subnet a provider will announce is a /24 so a /19 shouldn't be a problem. You will have to work with both providers to make sure the advertisements work (you did state that your current provider summarizes your network).
If you announce the routes out to two different providers via bgp then you MUST have your own ASN. This way the routes will be seen from your AS and not your providers. Since you will be multihomed in this set-up.
If your ISP is summarizing your traffic then you will need to make sure they stop that other wise you will never use one side. If you announce then the ISP should just forward your announcement upstream and you will be allowed to traffic shape and make adjustments however you want.
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