cancel
Showing results for 
Search instead for 
Did you mean: 
cancel
Announcements
Join Customer Connection to register!
82
Views
0
Helpful
1
Replies
asad.khokhar1
Beginner

BGP Issue in GNS3

Attached is a sample BGP lab i have created. I am testing resiliency of the network and i am new to BGP. I have attached the configs of the routers and the attached image shows the BGP layout. Once i break the link from 30.30.30.2/24 to 30.30.30.1/24, i am unable to ping 24.38.90.130/26 from the VPCS 10.10.91.100/24. Please advise. 

 Note that HT and 1000 represent two different sites and the user represents anyone on the Internet. 

1 REPLY 1
Pawan Raut
Enthusiast

Path from VPCS to 24.38.90.130 on HT-VPN is Internet-AS 1000-Core R1-1000 R2-HT and HT-VPN

R1-1000, R2-HT and HT-VPN having same same AS that is ibgp and the split horizon rule of ibgp is that do not advertised route received from one ibgp neighbor to other ibgp neighbor.

For 10.10.91.100 R1-1000 advertised route 10.10.91.0/24 to ibgp neighbor R2-HT but R2-HT not advertised this to its ibgp neighbor HT-VPN.

You can check the route for 10.10.91.100 on R2-HT and HT-VPN.

To overcome this situation you can make R2-HT as route reflector so that it will advertised ibgp route from one neighbor to other ibgp neighbor

on R2-HT ad below config.

router bgp 100
neighbor 24.38.90.66 route-reflector-client
neighbor 24.38.90.130 route-reflector-client

!

If you want more information on BGP route-reflector then see below link for reference.

https://networklessons.com/bgp/bgp-route-reflector

Kindly mark correct answer and rate post if it help to solve your issue.

Regards,

Pawan (CCIE#52104)