Chapter 34. Border Gateway Protocol - Lenovo RackSwitch G8264 Application Manual

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Chapter 34. Border Gateway Protocol

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 G8264es 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

The following topics are discussed in this section:

"Internal Routing Versus External Routing" on page 532

"Forming BGP Peer Routers" on page 537

"Loopback Interfaces" on page 540

"What is a Route Map?" on page 540

"Aggregating Routes" on page 544

"Redistributing Routes" on page 544

"BGP Attributes" on page 546

"Selecting Route Paths in BGP" on page 548

"BGP Failover Configuration" on page 549

"Default Redistribution and Route Aggregation Example" on page 551

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