BGP Cluster Query !?

[mohammed hashim]

Hi,

in my BGP testing, I have noticed something and would like to get some clarification on it:

R6 is the RR for R9

R2 and R4 are RR for both R1 and R3

R2 has normal iBGP peer with R6

My Notice:

on any of R1, R2, or R3,, if you advertise some NLRI, then all BGP routers will receive this NLRI

if you advertise something on R9 or R6, all BGP routers will receive this except R4

if you advertise something on R4, then all BGP routers will receive this update except R6 and R9

what is the explanation of this behavior !?

Note: I  am not implementing any kind of filtering, policies ,,, etc, just simple configuration started with

[Georg Pauwen]

Hello,

is this a Packet Tracer file ? If so, can you post it ? Otherwise post the configs of the routers so we can lab this...

[mohammed hashim]

Actually I got the issue where,

as I mentioned, R4 and R2 they are normal iBGP peers

so when R2 receives update from R6, it will not pass it to R4 (normal iBGP rule, to prevent looping, because iBGP peers should be in full mesh))

so in my case, I have to form iBGP peering between R6 and R4, and then it worked,

BTW, the topology is GNS3