BGP route election bug

RouterOS Forwarding Protocols
1

Hello guys,

I am ruuning RouterOS 5.21 on my core MikroTik x86 router and I have some problems about setting up the main-backup relationship between default originate available routes for outgoing traffic.

[sysadmin@MikroTik] > /ip route print detail                                       
Flags: X - disabled, A - active, D - dynamic, 
C - connect, S - static, r - rip, b - bgp, o - ospf, m - mme, 
B - blackhole, U - unreachable, P - prohibit 
 0 ADb  dst-address=0.0.0.0/0 gateway=x.x.x.x 
        gateway-status=x.x.x.x reachable via  vlan_directone_extern2 
        distance=20 scope=40 target-scope=10 bgp-as-path="zzzzz" bgp-weight=70 
        bgp-local-pref=70 bgp-med=0 bgp-origin=igp bgp-communities="" 
        received-from=do extern2 

 1  Db  dst-address=0.0.0.0/0 gateway=y.y.y.y 
        gateway-status=y.y.y.y reachable via  vlan_directone_extern 
        distance=20 scope=40 target-scope=10 bgp-as-path="zzzzz" bgp-weight=400 
        bgp-local-pref=400 bgp-med=0 bgp-origin=igp bgp-communities="" 
        received-from=do extern

How can a route with lower weight and local-pref be elected as active in despite of a route with higher values of them, and the same dst-address, distance, scope, traget-scope and bgp-as-path?

Thank you for accorded time!

Best regards,
Doru

2

Both peers are running on the same instance?

3

Nope. Different peers and instances here.

4

If instances are different then BGP route election algorithm doe snot apply. It is used only between routes form the same instance.