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Linux® Routing by Ron McCarty, Dee-Ann LeBlanc, Joe Brockmeier

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Border Gateway Protocol (BGP)

The child of EGP is the Border Gateway Protocol (BGP-4). This protocol has been through a number of versions, and the most current is BGP-4. All references to BGP in this chapter are to this fourth version. One of the primary issues that BGP-4 adds to the mix is that EGP was unable to handle some of IP version 6’s capabilities, which are covered in depth in Chapter 4, “IPv4 and IPv6 Addressing.”

BGP is another case in which you tell the AS border router who its neighbors are, and it has to get the information itself. In the BGP Active state, the AS border router opens a TCP connection with the new neighbor. After this connection is established, your machine does the following:

  • Sets the ConnectRetry timer to zero. ...

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