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Figure 57 Multihoming to multiple POPs of the same provider
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Figure 58 Multihoming to multiple providers
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Perhaps the major means of continuing to scale the Internet routing system is to aggregate as much as possible Good aggregation means that you combine several more-specific routes into a less-specific one without losing information that would affect the desired routing topology An AS can aggregate for other ASs feeding into it Done carelessly, this can cause significant problems, but, especially when the aggregation is done for space assigned by the AS, it can be a significant help to scalability
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Aggregation, also called supernetting or summarization, is the process of collapsing several more-specific prefixes into one less-specific prefix by moving the prefix boundary to the left Aggregatable prefixes are generally assumed to be contiguous, although there may be exceptions (See the discussion of a hole in the aggregate in Some Subtle Terminology ) For example, let us say you have the assignment 10000/16 You want to divide it into four parts (see Table
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SOME SUBTLE TERMINOLOGY RPSL uses the term aggregate to refer to the actual route generated, such as 10100/16 and the term component for the routes that are represented by the aggregate, such as {10110/24, 10120/24, and 10140/24} Notice that the components do not include 10130/24, which is a hole in the aggregate and must be explicitly identified in the aggregate specification Assume, for this example, that 10130/24 is a provider infrastructure prefix that the provider does not want to be accessible to the outside world The term more-specific is used to refer to all routes that exist and have longer, more-specific prefixes than the aggregate In this case, the more-specifics would be {10110/24, 10120/24, 10130/24, and 10140/24}
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53) First, realize that the first 16 bits (100/16) are fixed All your work will take place in the low-order bits Since our immediate concern is with splitting the assignment into four pieces, we will be concerned with two more bits, which in binary allows us to count to four Now, let s think a little about dotted decimal If we assumed all zeroes in the bits beyond the starting point of each quartile, we would get the ranges in Table 54 These differ only in the first 2 bits of the third octet or, in other words, their first 16 bits are identical They could therefore be aggregated into 10000/16
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STAY OUT OF TROUBLE These bits happen to be in the third octet of the dotted decimal expression, but until you are absolutely comfortable with what is happening in binary, please don t think about octets It is an almost guaranteed source of confusion
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Table 53 Splitting a Space into Binary Quartiles FIXED FIRST 18 00001010 00000000 00001010 00000000 00001010 00000000 00001010 00000000 BITS 17 18 00 01 00 00 USAGE First quartile Second quartile Third quartile Fourth quartile
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Administration, Addressing, and Naming Table 54 Dotted Decimal Quartiles BITS 17 18 AND REMAINDER 00 000000 00000000 01 000000 00000000 10 000000 00000000 11 000000 00000000 DOTTED DECIMAL EQUIVALENT 10000/18 106400/18 1012800/18 1019200/18
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FIXED FIRST 18 00001010 00000000 00001010 00000000 00001010 00000000 00001010 00000000
But There s an Art to This
I ve learned that new addressing designers sometimes try to aggregate too much Let s say you are given a /16 assignment, and you are setting up your internal topology, which has four POPs, a server farm, and a core You intend to use OSPF for your internal routing Many people and unfortunately several vendor routing courses would immediately say, Aha! I have four nonzero areas! I ll split my assignment into four parts! At first, this seems reasonable But where is the address space for area 0000 What about the server farm They don t belong in area 0000 You could use a different block of private address space That actually might be a good idea if these were registered addresses and you did not want area 0000 accessible from the outside But let s assume you want all your address space announced into an enterprisewide, or provider-wide, backbone of backbones In such a case, you might want to announce an aggregate that includes the backbone