Hi @crazycen .
In routerA you have
protocols bgp address-family ipv4-unicast network 172.16.253.0/24
And that network if from routerB, so it shoudn’t be advertise on routerA.
I made a lab, with this config on both routers:
RouterA
vyos@vrouter01a# run show config comm | grep bgp
set protocols bgp address-family ipv4-unicast network 172.16.250.0/24
set protocols bgp address-family ipv4-unicast network 172.16.252.0/24
set protocols bgp address-family ipv4-unicast network 172.16.254.0/24
set protocols bgp address-family ipv4-unicast redistribute ospf
set protocols bgp local-as '65000'
set protocols bgp neighbor 172.16.250.2 ebgp-multihop '2'
set protocols bgp neighbor 172.16.250.2 remote-as '65000'
set protocols bgp neighbor 172.16.250.2 update-source '172.16.250.1'
set protocols bgp neighbor 172.16.252.2 remote-as '65001'
set protocols bgp neighbor 172.16.252.2 update-source '172.16.252.1'
set protocols bgp neighbor 172.16.252.3 remote-as '65001'
set protocols bgp neighbor 172.16.252.3 update-source '172.16.252.1'
set protocols bgp parameters router-id '172.16.252.1'
RouterB:
vyos@vyos# run show config comm | grep bgp
set protocols bgp address-family ipv4-unicast network 10.110.11.0/24
set protocols bgp address-family ipv4-unicast network 10.110.12.0/24
set protocols bgp address-family ipv4-unicast redistribute connected
set protocols bgp address-family ipv4-unicast redistribute ospf
set protocols bgp local-as '65000'
set protocols bgp neighbor 172.16.250.1 ebgp-multihop '2'
set protocols bgp neighbor 172.16.250.1 remote-as '65000'
set protocols bgp neighbor 172.16.250.1 update-source '172.16.250.2'
set protocols bgp parameters router-id '172.16.253.1'
set protocols ospf redistribute bgp
vyos@vyos# run show config comm | grep ospf
set protocols bgp address-family ipv4-unicast redistribute ospf
set protocols ospf area 0 area-type normal
set protocols ospf default-information originate always
set protocols ospf default-information originate metric '10'
set protocols ospf default-information originate metric-type '2'
set protocols ospf default-information originate route-map '1'
set protocols ospf interface eth2 area '0'
set protocols ospf log-adjacency-changes
set protocols ospf neighbor 172.16.253.2
set protocols ospf parameters router-id '172.16.253.1'
set protocols ospf redistribute bgp
set protocols ospf redistribute connected
Routing Table on router B (where network 10.110.13.0/24 was learned via OSPF:
vyos@vyos# run show ip route | grep "B\|O"
O - OSPF, I - IS-IS, B - BGP, E - EIGRP, N - NHRP,
T - Table, v - VNC, V - VNC-Direct, A - Babel, D - SHARP,
F - PBR, f - OpenFabric,
> - selected route, * - FIB route, q - queued, r - rejected, b - backup
O>* 0.0.0.0/0 [110/10] via 172.16.253.2, eth2, weight 1, 00:27:33
O>* 10.110.13.0/24 [110/20] via 172.16.253.2, eth2, weight 1, 00:25:32
B>* 172.16.252.0/24 [200/0] via 172.16.250.1, vti10, weight 1, 00:35:51
O 172.16.253.0/24 [110/1] is directly connected, eth2, weight 1, 00:37:54
B 172.16.254.0/24 [200/0] via 172.16.250.1, vti10, weight 1, 00:35:51
Then, on routerA you can see that route to 10.110.13.0/24 was learned via BGP:
vyos@vrouter01a# run show ip bgp
BGP table version is 11, local router ID is 172.16.252.1, vrf id 0
Default local pref 100, local AS 65000
Status codes: s suppressed, d damped, h history, * valid, > best, = multipath,
i internal, r RIB-failure, S Stale, R Removed
Nexthop codes: @NNN nexthop's vrf id, < announce-nh-self
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
*>i0.0.0.0/0 172.16.253.2 10 100 0 ?
*>i10.110.11.0/24 172.16.250.2 0 100 0 i
*>i10.110.12.0/24 172.16.250.2 0 100 0 i
*>i10.110.13.0/24 172.16.253.2 20 100 0 ?
