I have over 500 Mikrotik routers in my network, some of them connected using l2tp links over LTE, generating a lot of disconnects and topology changes, thats why I consider implementing areas. I just encounter a problem and build a small lab to isolate this problem.
Right now, loopback address of router D 10.0.0.4/32 ( which belongs to backbone area ) is not accessible from router A ( 10.0.0.1/32 also backbone area) when link A - B or B - D goes down. Which is strange, because router C has 10.0.0.4/32 in his routing table, but does not pass it do routera A.
routers configuration:
router A:-
router B:-
router C:-
router D:
Right now, loopback address of router D 10.0.0.4/32 ( which belongs to backbone area ) is not accessible from router A ( 10.0.0.1/32 also backbone area) when link A - B or B - D goes down. Which is strange, because router C has 10.0.0.4/32 in his routing table, but does not pass it do routera A.
routers configuration:
router A:
Code:
/routing ospf instanceadd disabled=no name=ospf-instance-1 redistribute="" router-id=10.0.0.1/routing ospf areaadd disabled=no instance=ospf-instance-1 name=backboneadd area-id=1.1.1.1 disabled=no instance=ospf-instance-1 name=test/routing ospf interface-templateadd area=backbone disabled=no interfaces=ether2 networks=172.16.13.0/30add area=test disabled=no interfaces=ether3 networks=172.16.11.0/30add area=backbone disabled=no interfaces=loopback networks=10.0.0.1/32router B:
Code:
/routing ospf instanceadd disabled=no name=ospf-instance-1 redistribute="" router-id=10.0.0.2/routing ospf areaadd disabled=no instance=ospf-instance-1 name=backbone/routing ospf interface-templateadd area=backbone disabled=no interfaces=ether3 networks=172.16.13.0/30add area=backbone disabled=no interfaces=ether2 networks=172.16.13.4/30add area=backbone disabled=no interfaces=loopback networks=10.0.0.2/32router C:
Code:
/routing ospf instanceadd disabled=no name=ospf-instance-1 redistribute="" router-id=10.0.0.3/routing ospf areaadd area-id=1.1.1.1 disabled=no instance=ospf-instance-1 name=test/routing ospf interface-templateadd area=test disabled=no interfaces=ether3 networks=172.16.11.0/30add area=test disabled=no interfaces=ether2 networks=172.16.11.4/30add area=test disabled=no interfaces=loopback networks=10.0.0.3/32router D:
Code:
/routing ospf instanceadd disabled=no name=ospf-instance-1 redistribute="" router-id=10.0.0.4/routing ospf areaadd disabled=no instance=ospf-instance-1 name=backboneadd area-id=1.1.1.1 disabled=no instance=ospf-instance-1 name=test/routing ospf interface-templateadd area=backbone disabled=no interfaces=ether2 networks=172.16.13.4/30add area=test disabled=no interfaces=ether3 networks=172.16.11.4/30add area=backbone disabled=no interfaces=loopback networks=10.0.0.4/32Statistics: Posted by szuwaaar — Thu Mar 20, 2025 1:02 pm