Discard Default Router acquired by OSPF

RouterOS Forwarding Protocols
1

Hi, I have an infraestructure with OSPF and BGP Working.
In this border router I Receive default Gateway from mi service provider via eBGP, but this router receives default gateway from another router too, via OSPF, and I need to discard this second default gateway received by OSPF.
I have tried with in-filters like this in OSPF instance but It’s not working:
add chain=no-def disabled=no rule=
“if (dst in 0.0.0.0/0 && dst-len==0 ) { reject }”

Any help you can provide me I’d be grateful!!!

Thanks

2

default rule action is reject, if you didn’t accept this route in your input chain before, this rule will be filtered

/routing/route/print where ospf
Flags: F - FILTERED, A - ACTIVE; o - OSPF
Columns: DST-ADDRESS, GATEWAY, AFI, DISTANCE, SCOPE, TARGET-SCOPE, IMMEDIATE-GW
   DST-ADDRESS                GATEWAY                        AFI  DISTANCE  SCOPE  TARGET-SCOPE  IMMEDIATE-GW
Fo 0.0.0.0/0                  172.16.X.X%XXX           ip4       110     20            10  172.16.X.X%XXX

best practice is to accept only things you need…

3

And you could use simpler rule:
“if (dst == 0.0.0.0/0) { reject }”