Advanced IP Network Design (CCIE Professional Development)

Analyzing the Network's Distribution Layer for Summarization

The distribution layer's goals in hierarchical networking are to summarize and aggregate traffic. The following sections on summarizing toward the network core and summarizing toward the remote sites will give you a better idea of what you can do with summarization here.

Summarizing toward the Network Core

You can apply summarization to the inbound links toward the core to limit their advertisements to one or more summary routes representing all the subnets off of that distribution router. For example, in Figure 7-4, summarization occurs outbound from Router A and Router B on the serial links toward the core router.

For the setup in Figure 7-4, both Router A and Router B advertise ...