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Border Gateway Protocol, Route Manipulation, and IP Multicast

Chapter Description

Anthony Bruno and Steve Jordan covers the Border Gateway Protocol (BGP), route summarization and redistribution of route information between routing protocols, policy-based routing (PBR), and IP multicast protocols for use in preparation for the CCDA exam.

BGP Summary

The characteristics of BGP follow:

  • BGP is an exterior gateway protocol (EGP) used in routing in the Internet. It is an interdomain routing protocol.
  • BGP is a path vector routing protocol suited for strategic routing policies.
  • BGP uses TCP Port 179 to establish connections with neighbors.
  • BGPv4 implements CIDR.
  • eBGP is for external neighbors. It's used between separate autonomous systems.
  • iBGP is for internal neighbors. It's used within an AS.
  • BGP uses several attributes in the routing-decision algorithm.
  • BGP uses confederations and route reflectors to reduce BGP peering overhead.
  • The MED (metric) attribute is used between autonomous systems to influence inbound traffic.
  • Weight is used to influence the path of outbound traffic from a single router, configured locally.
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