How frequently do routing tables change in core-network routers? Once every 30sec? once every minute? every 5minutes?
I know that there is a Border Gateway Protocol that runs in the core Internet routers and learns about optimal network paths between adjacent routers, I am just wondering about the frequency of the routing table updates.
If, for example, a Youtube video starts streaming to my PC, what is the chance that the route taken by the packets - which start their journey, in theory, from some Google server, and end up after 15-20 hops to my PC - changes DURING the time I am watching the 10min video? Is it fair to say, that in most cases, the intermediate routers stay the same for a period of 10min? What is the probability of this not being the case? 5%? 20% ?
Thanks in advance.