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Address Space: Filtering

If Sprint doesn’t see 207.8.200.0/23 from ISP1 or ISP2, they’ll still see your provider’s 207.8.128.0/17 route.

So if your connectivity to ISP1 (the owner of 207.8.128.0/17) goes down, all will be well as long as ISP1 still sees 207.8.200.0/23 from ISP2.

Sprint -> ISP1 -> ISP2

This is why people don’t let you take IPs...

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