What does route reflector do?

The purpose of route reflectors is to fix that problem. To do so, the route reflector simply instructs R3 that, when it receives an advertisement from an IBGP neighbor (in this case, R2), it should break the rule and advertise to the other members of the system.

What is route reflector synchronization?

The Route Reflector performs route synchronization between all Route Reflector Clients so that the actual data path routing can occur. A Route Reflector does not provide services for the RAS Gateway upon which it is configured.

How does route reflector prevent loops?

Route Reflectors and Loop Prevention:

1. If a router received an iBGP route with the Originator-ID attribute set to its own router-id, the route is discarded.
2. If a route reflector receives a route with a cluster-list attribute containing its cluster-id, the route is discarded.

How is a route reflector identified in a cluster?

Each cluster is identified by a CLUSTER–ID. If there is only one route reflector in a cluster, then the CLUSTER–ID is the BGP identifier of the route reflector; otherwise, a common CLUSTER–ID can be defined for use by multiple route reflectors within a cluster.

Do you need MPLS for a route reflector?

The route reflectors do not need to MPLS (LDP is not activated), as they are not in the forwarding path. Nor do they have any VRFs configured. The RRs only hold the BGP VPNv4 table as shown in Figure 2.85.

Why do you need a BGP route reflector?

BGP route-reflectors (RRs) are considered a scalability tool that allows network designers to steer away from BGP full mesh requirements.

How does a route reflector work in OSPF?

Route reflectors work similarly to designated routers in OSPF. All iBGP routers within a route reflector group send the routes to the route reflector, which then distribute them to other directly connected route reflector peers. Route reflectors have the following properties: