Hello Martin, I think you need a static route along the multihop path for this to work or use OSPF in parallel.
Cheers, Mike -- Michael McConnell WINK Streaming; email: mich...@winkstreaming.com toll-free: 877-GO-4-WINK x 7400 direct: +1 732-705-7442 cell: +506 8706-2389 skype: wink-michael web: http://winkstreaming.com > On Aug 18, 2019, at 10:11 AM, Martin Bosner <m.bos...@x-ion.de> wrote: > > Hello, > > i'm a little desperate and helpless because i can't get any further with my > current problem: > > My current setup (all same AS only physical): > > router A ---- router B --- router C ------- router E --- router G > (has full \ | | > | > table uplink) \ | | | > \ | | > | > router D ------- router F --- router > H > > Router ABCD and router EFGH are each at the same location in a L2 network. > There are no additional static routing information but the one from the > interfaces and they are all connected via BGP using the same AS. All routers > can ping each other and no router has a default gw. All BGP sessions are > using the same table and are up and alive. All direct connected routers have > a "direct" connection and all non direct connected routers use multihop. > > The problem is that router G and router H only have invalid global routes > learned from router A while E and F are fine: > (using 223.230.128.0/22 <http://223.230.128.0/22> is just a random pick for > demonstration) > > > router G and H (PROBLEM): > > BIRD SHOW ROUTE > birdc show route 223.230.128.0/22 <http://223.230.128.0/22> all > BIRD 2.0.5 ready. > Table master4: > 223.230.128.0/22 <http://223.230.128.0/22> unreachable > [routerG_to_routerA 03:15:02.410 from 153.92.124.4] * (100/-) [AS45609?] > Type: BGP univ > BGP.origin: Incomplete > BGP.as_path: 15943 9498 45609 > BGP.next_hop: 153.92.124.4 > BGP.local_pref: 100 > > KERNEL > route -n | grep 223.230.128.0 > 223.230.128.0 - 255.255.252.0 ! 32 - 0 - > > CONFIG > protocol bgp routerG_to_routerA{ > local as 60664; > neighbor 153.92.124.4 as 60664; > source address 185.27.180.133; > enable route refresh yes; > multihop; > allow local as 60664; > ipv4 { > import all; > export all; > next hop self; > }; > } > > > router E and F (VALID): > > BIRD SHOW ROUTE > birdc show route 223.230.128.0/22 <http://223.230.128.0/22> all > BIRD 2.0.5 ready. > Table master4: > 223.230.128.0/22 <http://223.230.128.0/22> unicast [routerE_to_routerA > 02:42:58.878 from 153.92.124.4] * (100/?) [AS45609?] > via 192.168.0.1 on external > Type: BGP univ > BGP.origin: Incomplete > BGP.as_path: 15943 9498 45609 > BGP.next_hop: 153.92.124.4 > BGP.local_pref: 100 > > KERNEL > route -n | grep 204.34.123.0 > 204.34.123.0 192.168.0.1 255.255.255.0 UG 32 0 0 > external > > CONFIG > protocol bgp routerE_to_routerA{ > local as 60664; > neighbor 153.92.124.4 as 60664; > source address 192.168.0.2; > multihop; > allow local as 60664; > ipv4 { > import all; > export all; > next hop self; > }; > } > > > router A > > BIRD SHOW ROUTE > birdc show route 223.230.128.0/22 <http://223.230.128.0/22> all > BIRD 2.0.5 ready. > Table master4: > 223.230.128.0/22 <http://223.230.128.0/22> unicast [routerA_to_external > 23:01:24.661] * (100) [AS45609?] > via 84.44.0.210 on xge1 > Type: BGP univ > BGP.origin: Incomplete > BGP.as_path: 15943 9498 45609 > BGP.next_hop: 84.44.0.210 > BGP.local_pref: 100 > > KERNEL > route -n | grep 204.34.123.0 > 204.34.123.0 84.44.0.210 255.255.255.0 UG 32 0 0 xge1 > > CONFIG E (valid) > protocol bgp routerA_to_routerE{ > local as 60664; > neighbor 153.92.124.2 as 60664; > source address 153.92.124.4; > direct; > allow local as 60664; > ipv4 { > import all; > export all; > next hop self; > }; > } > > CONFIG G (problem) > protocol bgp routerA_to_routerG{ > local as 60664; > neighbor 185.27.180.133 as 60664; > source address 153.92.124.4; > multihop; > allow local as 60664; > ipv4 { > import all; > export all; > gateway recursive; > next hop self; > }; > } > > > I am using bird 2.0.5 and ubuntu 18.04 with 4.15.0-54-generic and already > played around with and without "next hop self" etc. but without luck. > > There seems to be a problem with my configuration or with the next hop > calculation, right? Or did i miss something else? > > Thank you in advance > Martin Bosner >
