BGP-4 Aggregation
One of BGP–4's main improvements over previous versions of BGP is its capability to handle CIDR and supernetting. CIDR and supernetting were first discussed in Chapter 3, "IP Addressing and Allocation Techniques," in the section "IP Address Space Depletion," as a means to control the growth of IP routing tables and the depletion of the IP address space.
Aggregation applies to routes that exist in the BGP routing table. This is in contrast to the network command, discussed earlier in this chapter, which applies to routes that exist in the IP routing table. Aggregation can be performed if at least one more-specific route of the aggregate exists in the BGP routing table.
Cisco Systems offers a variety of ways to manipulate aggregates ...
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