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Routing issue while using 2 router Draytek Vigor 3910 with VLANs

it flag

I'm having problem when using 2 Draytek Vigor 3910 at the same time. This diagram was working well with Vigor 3900 but they replaced to new model 3910.

enter image description here

My issue: 1, OSPF between 2 router's not working OSPF config:

  • LAN1, vlan51,52,53 was enabled on Router 1, area 11, id 1, same password, md5 disabled
  • LAN2, vlan54,55,56 was enabled on Router 2, area 11, id 1, same password, md5 disabled Both Routers can see each other as neighbor but routing table only update 1 O record: 192.168.12.0/0.255.255.255 2, I tried enable RIP protocol on LAN1 of both routers, routing table is updated. However the connection from vlans on Router1 to Router2 is inconsistent (timeout alot when I try ICMP)

There's no problem when I connect PC from 192.168.12.0 subnet with gateway 192.168.12.101 or 192.168.12.102 I'm not sure if this's a problem with this Router model or not. Thank you for helping.

Zac67 avatar
ru flag
If the routers can see/ping each other, the OSPF config is the problem. If not, check whether their MAC addresses are visible on the switch in between in the desired VLANs. If that doesn't work, the VLAN trunks are badly configured.
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