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Update to use "ASes", BGP table size
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scaling/global.rst

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@@ -60,7 +60,7 @@ use within their networks and on how metrics should be assigned to links
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in their network. Because of this independence, each provider’s network
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is usually a single *autonomous system* (AS). We will define this term
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more precisely in a later section, but for now it is adequate to think
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of an AS as a network that is administered independently of other ASs.
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of an AS as a network that is administered independently of other ASes.
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The fact that the Internet has a discernible structure can be used to
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our advantage as we tackle the problem of scalability. In fact, we need
@@ -209,7 +209,7 @@ improving scalability, the AS model decouples the intradomain routing
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that takes place in one AS from that taking place in another. Thus, each
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AS can run whatever intradomain routing protocols it chooses. It can
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even use static routes or multiple protocols, if desired. The
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interdomain routing problem is then one of having different ASs share
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interdomain routing problem is then one of having different ASes share
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reachability information—descriptions of the set of IP addresses that
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can be reached via a given AS—with each other.
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@@ -320,8 +320,8 @@ able to forward any packet destined anywhere in the Internet. That means
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having a routing table that will provide a match for any valid IP
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address. While CIDR has helped to control the number of distinct
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prefixes that are carried in the Internet’s backbone routing, there is
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inevitably a lot of routing information to pass around—roughly 700,000
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prefixes in mid-2018.
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inevitably a lot of routing information to pass around—the number of
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prefixes has exceeded one million by 2025.
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A further challenge in interdomain routing arises from the autonomous
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nature of the domains. Note that each domain may run its own interior

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