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BMD00220, October 2010 259
CHAPTER 19
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 G8124s can advertise their IP interfaces and IPv4 addresses using BGP and take BGP
feeds from as many as 16 BGP router peers. This allows more resilience and flexibility in balancing
traffic from the Internet.
Note – BLADEOS 6.5 does not support IPv6 for BGP.
The following topics are discussed in this section:
“Internal Routing Versus External Routing” on page 260
“Forming BGP Peer Routers” on page 261
“What is a Route Map?” on page 261
“Aggregating Routes” on page 265
“Redistributing Routes” on page 265
“BGP Attributes” on page 266
“Selecting Route Paths in BGP” on page 267
“BGP Failover Configuration” on page 268
“Default Redistribution and Route Aggregation Example” on page 270