Chapter 28. Border Gateway Protocol - Lenovo RackSwitch G8264CS Application Manual

Chapter 28. Border Gateway Protocol

© Copyright Lenovo 2017
Border Gateway Protocol (BGP) is an Internet protocol that enables routers on an
IPv4 network to share and advertise routing information with each other about the
segments of the IPv4 address space they can access within their network and with
routers on external networks. BGP allows you to decide what is the "best" route for
a packet to take from your network to a destination on another network rather than
simply setting a default route from your border router(s) to your upstream
provider(s). BGP is defined in RFC 1771.
RackSwitch G8264CSes can advertise their IP interfaces and IPv4 addresses using
BGP and take BGP feeds from as many as 96 BGP router peers. This allows more
resilience and flexibility in balancing traffic from the Internet.
Note: Lenovo Enterprise Network Operating System 8.4 does not support IPv6 for
BGP.
The following topics are discussed in this section:
"Internal Routing Versus External Routing" on page 446

 "Forming BGP Peer Routers" on page 451
 "Loopback Interfaces" on page 454
 "What is a Route Map?" on page 454
 "Aggregating Routes" on page 458
 "Redistributing Routes" on page 458
 "BGP Attributes" on page 460
 "Selecting Route Paths in BGP" on page 462
 "BGP Failover Configuration" on page 463
 "Default Redistribution and Route Aggregation Example" on page 465
445