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1 DanielLawson 1 [RouteAggregation] refers to the collection of "adjacent" routes together, in order to shorten the routing tables. It is made possible with ClasslessInterDomainRouting ([CIDR]).
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3 If you have enough adjacent routes to use a higher prefix, you can use RouteAggregation. For example, if your network has
4 192.168.0.0/24
5 192.168.1.0/24
6 On different subnets internally, you can advertise the whole lot by using 192.168.0.0/23. A /23 prefix has one less bits than a /24, which is 2 networks - so the 2 adjacent /24 networks starting from 192.168.0.0/24 can be thought of as a single /23
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9 Essentially any CIDR prefix can be thought of as the aggregation of all longer prefixes under it:
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11 192.168.0.0/16 is the aggregation of the 256 192.168.x.0/24 addresses
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13 A /24 prefix is the aggregation of the 4 /25 prefixes under it
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15 See http://jodies.de/ipcalc for a CIDR subnet calculator
2 DanielLawson 16
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19 Part of CategoryNetworking