![]() Vanilla BGP: non-multipath BGPīefore we dive into the specifics of BGP multipath, let’s review how traditional BGP works. See the Cisco and Nokia documentation for more information on their syntax. The syntax for other vendors is very similar. Throughout this article, we will use Juniper configuration and operational show command outputs. However, if you’re not familiar with protocol hierarchies, see Juniper’s Understanding Route Preference Values article. There is a default hierarchy that you generally should not modify. We will also discuss the more advanced unequal-cost multipathing (UCMP) and its caveats.īefore we dive in, note that in all router implementations, a static route or an IGP route (OSPF, ISIS) is preferred over a BGP route. This article will review the principles, benefits, and potential drawbacks of BGP multipath with a focus on equal-cost multipathing (ECMP), which uses multiple identically-performing paths. ![]() Understanding how BGP multipath works and the tradeoffs involved in its implementation can help you improve your network engineering skill set. BGP multipath allows multiple BGP routes to be used simultaneously to reach the same destination.
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