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There are online databases and services available with this information, which associate IP-addresses, IP-address ranges or ASNs with the type of company that owns it. But it's unclear how accurate the info in those databases is. (They are probably all based on inferred data, since there doesn't seem to be an official Internet registry that list such ...


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Just as it takes time for the more specific announcement to propagate, it takes time for the withdrawal to propagate. But unlike for the former, the later results in traffic heading into a dead end as the route-removal traverses the tree. In the chain of "A - B - C - D - E", where A is datacenter B, the instant B processes the withdrawal, it will ...


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NX-OS 7.x likely does not support BFD BGP Multihop BFD BGP multihop support was introduced in NX-OS 8.1(1) according to the NX-OS 7K Command Guide. BFD BGP multihop support was introduced in NX-OS 9.2(1) according to the NX-OS 9K Command Guide. The NX-OS 5.x Command Guide explicitly calls out support for only for single-hop EBGP and iBGP peers. Finally, ...


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Imagine if you had the following network topology, with both R1 and R2 configured for the type of unequal-cost multipath you've described. Packets bound for the Internet might be sent by R1 to ISP1, or they might be sent to R2. But R2 also has a 50% chance to send those packets, from R1, back to R1. Some packets would loop between R1 and R2 until their TTL ...


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Short answer: you can't. You are asking to route traffic not by the destination address, but by the source address. In other words, you want traffic to take a particular path based on its source address (i.e., sourced from obscure ISP). That's not how routing normally works. It would be technically possible to make this happen using policy-based routing, ...


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