DELL S50V User Manual

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Border Gateway Protocol IPv4 (BGPv4)

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 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. 

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

{

{

{

Route Reflector

Route Reflector Client Peers

iBGP Route

iBGP Routes

iBGP Routes