Reference Guide

120 | Border Gateway Protocol
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• If a route was received from a nonclient peer, reflect the route to all client peers.
• If the route was received from a client peer, reflect the route to all nonclient and all client peers.
To illustrate how these rules affect routing, refer to Figure 8-3 and the following steps. Routers B, C, D, E,
and G are members of the same AS - AS100. These routers are also in the same Route Reflection Cluster,
where Router D is the Route Reflector. Router E and H are client peers of Router D; Routers B and C and
nonclient peers of Router D.
Figure 8-3. Route Reflection Example
1. Router B receives an advertisement from Router A through eBGP. Since the route is learned through
eBGP, Router B advertises it to all its iBGP peers: Routers C and D.
2. Router C receives the advertisement but does not advertise it to any peer because its only other peer is
Router D, an iBGP peer, and Router D has already learned it through iBGP from Router B.
3. Router D does not advertise the route to Router C because Router C is a nonclient peer and the route
advertisement came from Router B who is also a non-client peer.
4. Router D does reflect the advertisement to Routers E and G because they are client peers of Router D.
5. Routers E and G then advertise this iBGP learned route to their eBGP peers Routers F and H.
Communities
BGP communities are sets of routes with one or more common attributes. This is a way to assign common
attributes to multiple routes at the same time.
Router A Router B
Router C
Router D
Router E
Router G
Router F
Router H
{
eBGP Route
{
eBGP Route
{
eBGP Route
Route Reflector
Route Reflector Client Peers
iBGP Route
iBGP Routes
iBGP Routes