Objectives
The simulator ticks each one as soon as the network meets it.
Every router is in AS 65000. Each PE peers only with the RR at 4.4.4.4, sourcing from Loopback0.
On the RR, peer with 1.1.1.1, 2.2.2.2 and 3.3.3.3 from Loopback0 and make them route-reflector clients.
Each PE advertises its customer prefix: 192.168.1.0/24, 192.168.2.0/24 and 192.168.3.0/24.
Check PE1’s routing table: 192.168.3.0/24 is reflected with next hop 3.3.3.3.
PC1 pings PC3 (192.168.3.10).
Before you start
iBGP split horizon stops a router from passing iBGP routes to other iBGP peers. A route reflector relaxes the rule: routes from a client go to every peer, and routes from a non-client go to clients only. The reflector does not change the next hop, so the IGP must reach every PE loopback. Cisco: neighbor x route-reflector-client.
Concept
BGP route reflectors
iBGP routers do not pass iBGP-learned routes to other iBGP peers, so without help every router needs a session with every other (a full mesh). A route reflector is allowed to pass them on to its clients, so each PE needs only one session.
