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BGP Best External

BGP Best External is used in Active Standby BGP Topologies generally but not limited with that.BGP Best External feature helps BGP to converge much faster by sending external BGP prefixes which wouldn’t normally be sent if they are not overall BGP best path.

There are BGP best internal, BGP best external and BGP Overall best path.

BGP Best external in an active-standby scenarios can be used in MPLS VPN, Internet Business Customers, EBGP Peering Scenarios, Hierarchical large scale Service Provider backbone and many others.

But,How active-standby scenario connection with BGP is created ? In which situation people use active-standby instead of active-active connection ?

Let’s start with the below scenario.

bgp best external

Figure -1 BGP Active-Standby Path Selection Example

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BGP PIC Edge provides sub second convergence time in the case of edge link or node failure. BGP PIC is a useful for MPLS VPN service and can be provided by the Service provider as a value added service thus might provide additional revenue.

BGP PIC provides sub second converge time in case link or node failure, and BGP PIC edge covers the edge failure cases.Sub second convergence is not possible without PIC – Prefix Independent Convergence for BGP.

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