Injecting Routes into BGP for Advertisement to the ISPs
So far, this chapter has focused on configuring eBGP peers and the routes learned by enterprise routers from eBGP peers at ISPs. These outbound routes let the enterprise routers forward packets toward the Internet.
At the same time, the ISPs need to learn routes for the enterprise’s public IP address space. This chapter assumes that the choice to use BGP has already been made, so using BGP to advertise the enterprise’s public IP address range makes good sense. This short final major section of this chapter examines the options for advertising these routes. Specifically, this section looks at two options:
BGP network command
Redistribution from an IGP
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