Orhan Ergun No Comments

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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Orhan Ergun 6 Comments

BGP PIC – Prefix Independent Convergence

BGP PIC ( Prefix Independent Convergence )  is a BGP Fast reroute mechanism which can provides sub second convergence even for the 500K internet prefixes by taking help of IGP convergence.

BGP PIC uses hierarchical data plane in contrast to flat FIB design which is used by Cisco CEF and many legacy platforms. Read more