The popularity of BGP stems from its ability to add redundancy in support of critical networks and their connections for two-way traffic (inbound and outbound). BGP also can be used to load balance, or load share, traffic across multiple links. Load balancing of BGP traffic is possible when a BGP AS speaker (router) learns of two EBGP paths for an IP prefix from a neighboring autonomous system. By default, the BGP routing process selects the path with the lowest router ID to enter into its routing table. BGP multipath must be enabled for BGP to take advantage of multiple paths to a destination.
BGP can support up to eight paths to a destination, either load balancing or load sharing across each path.
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