BGP PIC EDGE

Continuing from our previous post, we will now see how BGP PIC EDGE works. We will use the same topology. The only difference is that I have removed R4 as route-reflector. All the PEs have full mesh IBGP neighbourship. 

At the moment R2 learns 8.8.8.8/32 from R6 and R7. It prefers the path with the next-hop of 6.6.6.6 over 7.7.7.7.

BGP PIC CORE

Happy New Year Folks!

In one of the previous posts, we looked at EIGRP FRR and OSPF LFA feature which helps achieving fast convergence.

There is a similar feature  in BGP which is called PIC (Prefix Independent Convergence). It speeds up the convergence of the FIB in failover conditions. BGP works differently than any IGP. It is designed to carry hundreds of thousands routes in the routing table hence fast failover works differently in BGP. There are couple of ways to implement PIC in BGP. They are "PIC Core" and "PIC Edge". We will look into both of these options.

Let's look at the below topology.