As was stated earlier in this chapter, BGP provides NLRI connectivity between different routing domains (autonomous systems) or within the same routing domain. Therefore, when BGP is enabled, the BGP speaker must be configured with an autonomous number using the router bgp [autonomous system number] global configuration command.
While EIGRP also uses autonomous system numbers, there are some significant differences in the use of autonomous system numbers when implementing EIGRP and when implementing BGP. With EIGRP, routers establish a neighbor relationship only if they are part of the same autonomous system; although you should keep in mind that . . .
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