OSPF question over dot1q trunk

Question

above i have two L3 switches. ESW1 has vlan 10 and 20 ESW2 has vlan 10 and 30 (the same ten)

when i configure OSPF on both ESW1 and ESW2 it doesn't neighbor. I want OSPF to advertise vlan 20 to ESW2 and vlan 30 to ESW1

I did create a SVI for Vlan 20 on ESW2 and 30 on ESW3 so they could talk.

I just want to know if its possible to have OSPF advertising the unique Vlans to each other in area 0.

ESW1 Config

interface Vlan1 
no ip address 
shutdown 
! 
interface Vlan10 
ip address 10.10.10.254 255.255.255.0 
ip ospf network point-to-point 
! 
interface Vlan20
 ip address 10.10.20.254 255.255.255.0 
! 
router ospf 1 
log-adjacency-changes 
network 10.10.20.0 0.0.0.255 area 0 
! 
ip forward-protocol nd 
! 
! 
no ip http server 
no ip http secure-server 
! 
no cdp log mismatch duplex 
! 
!

ESW 2

! 
interface Vlan1 
no ip address 
shutdown 
! 
interface Vlan10 
ip address 10.10.10.253 255.255.255.0 
ip ospf network point-to-point 
! 
interface Vlan30 
ip address 10.10.30.254 255.255.255.0 
! 
router ospf 1 
log-adjacency-changes 
network 10.10.30.0 0.0.0.255 area 0 
!

Answer 1

You need to include VLAN 10 in your OSPF configuration. You have only specified that OSPF uses the interfaces on VLANs 20 and 30. OSPF needs a common subnet in order to create adjacencies.

You can add the network statement

network 10.10.10.0 0.0.0.255 area 0

to your OSPF config on both routers

Answer 2

the dot1q trunk is L2 , so you should configure L3 link between the 2 switches. you may need to configure link aggregation between the two switches then assign IPs in same range for the two switches and then try the OSPF configurations.

Answer 3

OSPF does not advertise VLAN information. Cisco's VTP does. OSPF does not form peering sessions like BGP does, it establishes neighbor relationships; the time to live (TTL) value of OSPF packets is 1.

To get your OSPF processes to establish a neighbor relationship, each layer 3 switch (aka router) needs to share a layer2 (Ethernet) link and IP subnet.