This is normal, BGP does not install the route into the table unless the next-hop is reachable ( meaning installed in the RIB). How it is installed in the RIB: IGP, BGP, Connected, Static is irrelevant, as long as it exists in the RIB when the BGP scanner goes through its table.
Cheers Dino -----Original Message----- Message: 2 Date: Mon, 1 Aug 2016 10:36:00 +1000 From: Kamal Dissanayaka <[email protected]> To: [email protected] Subject: [c-nsp] BGP next hops in BGP not in IGP Message-ID: <CAL1UUpVbfVtgePghe8f=zaci_gqatl1pbna5taenfqo18ed...@mail.gmail.com> Content-Type: text/plain; charset=UTF-8 HI All, As my knowledge, BGP next hop needs to be in IGP in order to get BGP routes in routing table. It looks like, it may have changed ? BGP routes populate in routing table when the next-hp route is learned through BGP. I tried some googling but I cannot get definite answer. here is the scenrio Router A (18162) 172.18.112.41---- 172.18.112.40 Router B (65001) 172.18.112.37 --- 172.18.112.38 Router C (65001) On router C, Subnet 172.18.112.40/30 is learned through IBGP, As far as I remeber on my old school this subnet should be learned through IGP to work properly. Router C# sh ip route 172.18.112.41 Routing entry for 172.18.112.40/30 Known via "bgp 65001", distance 200, metric 0, type internal Last update from 172.18.112.37 3w3d ago Routing Descriptor Blocks: * 172.18.112.37, from 172.18.112.37, 3w3d ago Route metric is 0, traffic share count is 1 AS Hops 0 However other routes advertised from Router A is on routing table of Router C. Is it something expected ?? ##################################################################################### Confidentiality and Privilege Notice This document is intended solely for the named addressee. The information contained in the pages is confidential and contains legally privileged information. If you are not the addressee indicated in this message or responsible for delivery of the message to such person, you may not copy or deliver this message to anyone, and you should destroy this message and kindly notify the sender by reply email. Confidentiality and legal privilege are not waived or lost by reason of mistaken delivery to you. ##################################################################################### _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
