RtBrick has set a new benchmark in Internet routing, delivering route convergence on a disaggregated network that is at least as fast as anything seen on traditional proprietary systems. The Internet relies on nearly one million paths which are shared between its routers using the BGP (Border Gateway Protocol) If any one of these routers, has a problem, full connectivity isn’t restored until the router has re-learned the entire topology of the network, a process referred to as convergence.
Source: https://www.helpnetsecurity.com/2021/07/14/rtbrick-route-convergence/