Synch rules and the full mesh

- [Instructor] The surgeon general has asked me…to give you the following warning.…There are no labs in this video.…I know, boring!…I'll try to make it less boring, I promise.…But, there's some very important theory covered…in this video that's going to affect…some of what you see in the rest of this section,…and we need to know this stuff, so I want to show you this…on the board, and you'll see why in the next few minutes.…Now, a BGP speaker, it's going to advertise a route…to an internal neighbor under certain circumstances,…not all circumstances.…

Now, if that route was created by the router…that's going to do the advertising via the network command,…no problem.…If the route was learned via static route redistribution,…or IGP route redistribution, or if the advertised route…is a directly connected route,…then a BGP speaker will advertise it…to an internal neighbor.…Now, you look at that list and you say,…sounds like a pretty comprehensive list to me,…but there's one very common circumstance missing…from that list.…