10-20-2023 02:47 AM
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!
Solved! Go to Solution.
10-20-2023 03:14 AM
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.
10-20-2023
02:53 AM
- last edited on
10-20-2023
06:26 PM
by
Translator
Can I see
Show ip bgp
in RR and R5 and R7
10-20-2023
02:55 AM
- last edited on
10-20-2023
06:27 PM
by
Translator
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
10-20-2023 03:04 AM
From this I see best prefix from as100 not from as300.
10-20-2023 03:07 AM
So, it doesn't even accept the alternative BGP routes in the BGP database?
10-20-2023 03:14 AM
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.
10-20-2023 04:21 AM
Thank you very much!
10-20-2023 05:14 AM
You are so welcome
10-20-2023
02:55 AM
- last edited on
10-20-2023
06:29 PM
by
Translator
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
10-20-2023
02:56 AM
- last edited on
10-20-2023
06:30 PM
by
Translator
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#
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