BGP Advertising issue with single prefix

[spanz]

Hello,

I have to set BGP on my Fortigate 600E appliance with my isp.

I already configured neighbors, AS and advertised routes and everything is working fine except:

There's 1 network in my routing table which is 10.10.0.0/16

I have to advertise to my neighbor only the 10.10.60.0/24 network and not the whole /16 subnet (he set it in his prefix filter) so

I added another static route of 10.10.60.0/24 for my local routing table with the same gateway as the 10.10.0.0/16 has, and advertised it to my BGP Neighbor.

Now, my neighbor gets all the networks I advertise except the 10.10.60.0/24

Routing table (only the routes assosiated with that issue) : 

S 10.10.0.0/16 [1/0] via 15.15.15.1, port5, [0/50] S 10.10.60.0/24 [10/0] via 15.15.15.1, port5

BGP Advertise to neighbor (get router info bgp neighbors <ip address of neighbor> advertised-routes):

*> 10.10.60.0/24   93.52.12.2                  100  32768        0 i <-/->

I dont see what is the problem.. I can see I have it in my local routing table and advertise the network but they still cant get it.

Appreciate any help! 

Thanks

[Toshi_Esumi]

Is this MPLS circuit or Internet with the ISP? If MPLS, likely it's summarized by the provider because the /24 route is redundant. Either ask the provider or try filtering out the /16 route from advertisement.

[spanz]

Thanks for the reply. These are all private addresses, and not internet.. it is indeed MPLS or IPVPN ... However.. And the /16 is not advertised. It is just in the routing table in my fortigate, For BGP im advertising only the /24 and the isp put the /24 in his prefix filter list as all the other network Im advertising to him (they are all /24 and all work except this one.)

[Toshi_Esumi]

Then you already know nothing you can do on your FGT. Call the provider/MSP (managed service provider) to ask why they're dropping it.

[spanz]

I posted this issue after I tried to reconfigured it all, so as my ISP.

I think the problem is on my side since all my /24 advertisements works fine and have a corresponding route in the routing table, and this specific one is originally /16 in my routing table, and I just made another /24 route for the BGP route to be advertised.

maybe I should change costs at the FGT routing table ??

[spanz]

Solved.

The problem was on the ISP side..

Wrong settings of the receiving prefix filter list.

Thank for your help !!

[jenifar]

thanks for information. At Tradie Developers, we combine our technical expertise with a deep understanding and history in the trades industry to deliver professional tradie websites, tradie marketing and tradie SEO that truly makes a difference. Our commitment to quality, attention to detail, and dedication to client success sets us apart as a trusted partner for Aussie tradesmen looking to succeed online. Get in touch with us today to start your journey towards a stronger online presence and watch as your business grows!