BGP Route Reflector Client not advertising all routes ti RR Server

[kristiqirjako99]

Hello,

I am having a problem with BGP route reflector client. The topology is attached. So, R7 which is a route reflector client doesn't advertise all routes to R6, more specifically the routes of AS100 are not advertised.

Anyway, if I shut down the link between AS200 and AS100, R7 advertises those routes. Is there a solution, to have all routes advertised, am I missing something in configuration or?

Thanks in advance!

[MHM Cisco World]

Can I see 

Show ip  bgp

in RR and R5 and R7

[kristiqirjako99]

R7#show ip bgp all
For address family: IPv4 Unicast

BGP table version is 47, local router ID is 17.0.0.7
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter,
x best-external, a additional-path, c RIB-compressed,
Origin codes: i - IGP, e - EGP, ? - incomplete
RPKI validation codes: V valid, I invalid, N Not found

Network Next Hop Metric LocPrf Weight Path
*>i 10.0.0.0/24 14.0.0.2 0 100 0 100 i
* 17.0.0.8 0 300 100 i
*>i 11.0.0.0/24 14.0.0.2 0 100 0 100 i
* 17.0.0.8 0 300 100 i
*>i 12.0.0.0/24 14.0.0.2 0 100 0 100 i
* 17.0.0.8 0 300 100 i
*>i 13.0.0.0/24 14.0.0.2 0 100 0 100 i
* 17.0.0.8 0 300 100 i
*>i 14.0.0.0/24 15.0.0.5 0 100 0 i
* 17.0.0.8 0 300 100 i
*>i 15.0.0.0/24 16.0.0.6 0 100 0 i
*> 16.0.0.0/24 0.0.0.0 0 32768 i
* i 16.0.0.6 0 100 0 i
* 17.0.0.0/24 17.0.0.8 0 0 300 i
Network Next Hop Metric LocPrf Weight Path
*> 0.0.0.0 0 32768 i
* i 19.0.0.0/24 14.0.0.2 0 100 0 100 i
*> 17.0.0.8 0 0 300 i

For address family: IPv4 Multicast

For address family: MVPNv4 Unicast

[MHM Cisco World]

From this I see best prefix from as100 not from as300.

[kristiqirjako99]

So, it doesn't even accept the alternative BGP routes in the BGP database?

[MHM Cisco World · Accepted solution]

What is alternative here ? Path from as100-as300 then to R7?

If it then no' bgp select only one path best by defualt 

But you can make R7 select two path if you use multipath with as relax.

Here R7 will use two path one from RR (As100) and other from as300-as100.

[kristiqirjako99]

Thank you very much!

[MHM Cisco World]

You are so welcome 

[kristiqirjako99]

R5#show ip bgp all
For address family: IPv4 Unicast

BGP table version is 67, local router ID is 15.0.0.5
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter,
x best-external, a additional-path, c RIB-compressed,
Origin codes: i - IGP, e - EGP, ? - incomplete
RPKI validation codes: V valid, I invalid, N Not found

Network Next Hop Metric LocPrf Weight Path
*> 10.0.0.0/24 14.0.0.2 0 0 100 i
*> 11.0.0.0/24 14.0.0.2 0 0 100 i
*> 12.0.0.0/24 14.0.0.2 0 100 i
*> 13.0.0.0/24 14.0.0.2 0 100 i
* 14.0.0.0/24 14.0.0.2 0 0 100 i
*> 0.0.0.0 0 32768 i
* i 15.0.0.0/24 15.0.0.6 0 100 0 i
*> 0.0.0.0 0 32768 i
*>i 16.0.0.0/24 15.0.0.6 0 100 0 i
*>i 17.0.0.0/24 16.0.0.7 0 100 0 i
*> 19.0.0.0/24 14.0.0.2 0 100 i

For address family: IPv4 Multicast

For address family: MVPNv4 Unicast

[kristiqirjako99]

R6#show ip bgp all
For address family: IPv4 Unicast

BGP table version is 62, local router ID is 16.0.0.6
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter,
x best-external, a additional-path, c RIB-compressed,
Origin codes: i - IGP, e - EGP, ? - incomplete
RPKI validation codes: V valid, I invalid, N Not found

Network Next Hop Metric LocPrf Weight Path
*>i 10.0.0.0/24 14.0.0.2 0 100 0 100 i
*>i 11.0.0.0/24 14.0.0.2 0 100 0 100 i
*>i 12.0.0.0/24 14.0.0.2 0 100 0 100 i
*>i 13.0.0.0/24 14.0.0.2 0 100 0 100 i
*>i 14.0.0.0/24 15.0.0.5 0 100 0 i
* i 15.0.0.0/24 15.0.0.5 0 100 0 i
*> 0.0.0.0 0 32768 i
* i 16.0.0.0/24 16.0.0.7 0 100 0 i
*> 0.0.0.0 0 32768 i
*>i 17.0.0.0/24 16.0.0.7 0 100 0 i
*>i 19.0.0.0/24 14.0.0.2 0 100 0 100 i
* i 17.0.0.8 0 100 0 300 i

For address family: IPv4 Multicast

For address family: MVPNv4 Unicast

R6#