Where is the best place to install a router reflector?
Route Reflector Placement From a topology perspective, the route-reflectors are best placed centrally. This helps to prevent sub-optimal routing. Regular BGP speakers may peer with Route Reflectors, or other non-RR’s. Ideally, it’s best to have all non-RR’s peering with route-reflectors.
How do I setup a reflector route?
When you configure a route reflector you have to tell the router whether the other IBGP router is a client or non-client. A client is an IBGP router that the route reflector will “reflect” routes to, the non-client is just a regular IBGP neighbor.
What is the purpose of a route reflector?
The Role of Route Reflectors 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.
Should route reflectors be clients of each other?
If the route was learned from a client, it is reflected to all nonclients and clients, except for the originating client. If the route was learned from an EBGP peer, it is reflected to all clients and nonclients. The route reflector functionality has to be supported only on the route reflector itself.
Does route reflector change next hop?
Does the route reflector change the next hop attribute of a reflected prefix? By default, the next hop attribute is not changed when a prefix is reflected by route reflector.
What is the difference between route reflector and confederation?
You configure confederation ID (AS number to the external autonomous systems), router’s own sub-AS ID and peer sub-AS IDs on the routers. Peering Route reflectors are peered with each other in full-mesh. EBGP like protocol (EIBGP, also called confederation BGP or CBGP) is used between sub-autonomous systems.
How do route reflectors work?
Using a route reflector, you group routers into clusters, which are identified by numeric identifiers unique to the autonomous system (AS). Within the cluster, you must configure a BGP session from a single router (the route reflector) to each internal peer.
What is route reflector and why it is required?
Route reflectors have the special BGP ability to readvertise routes learned from an internal peer to other internal peers. So rather than requiring all internal peers to be fully meshed with each other, route reflection requires only that the route reflector be fully meshed with all internal peers.
Why BGP Cannot change next hop?
BGP Next Hop Is not Changed on IBGP Sessions All routers within an autonomous system are assumed to be able to reach the same set of subnets (advertised through IGP). Consequently, when an AS edge router propagates external BGP prefixes to internal BGP peers, it does not change the BGP next hop.
What is BGP Med?
The BGP MED attribute, commonly referred to as the BGP metric, provides a means to convey to a neighboring Autonomous System (AS) a preferred entry point into the local AS. BGP MED is a non-transitive optional attribute and thus the receiving AS cannot propagate it across its AS borders.
How does route reflector prevent loops?
Removing the full mesh requirements in an IBGP topology introduces the potential for routing loops. When RFC 1966 was drafted, two other BGP route reflector specific attributes were added to prevent loops.
