I have a strange issue with OSPF between two NON-directly connected Nexus switches:
N7k-1# sh ip ospf neighbors 172.22.22.204 OSPF Process ID 100 VRF default Total number of neighbors: 38 Neighbor ID Pri State Up Time Address Interface 172.22.22.204 1 EXSTART/DROTHER 00:23:01 10.2.0.4 Vlan10
N7k-4# sh ip ospf neighbors 172.22.22.201 OSPF Process ID 100 VRF default Total number of neighbors: 26 Neighbor ID Pri State Up Time Address Interface 172.22.22.201 15 EXSTART/DR 00:24:09 10.2.0.1 Vlan10
N7k-4# sh run interface vlan 10
interface Vlan10 description ospf_transit no shutdown no ip redirects ip address 10.2.0.4/24
router ospf 100 router-id 172.22.22.204
N7k-1# sh run int vlan 10
interface Vlan10 description ospf_transit no shutdown no ip redirects ip address 10.2.0.1/24 ip ospf priority 15
router ospf 100 router-id 172.22.22.201
And yes, I've checked it is not MTU issue! This is the output of the "sh ip ospf event-history adjacency" command executed on the N7k-4 switch :
2019 May 17 15:33:19.396439 ospf 100 : : Sending DBD to 10.2.0.1 on Vlan10 2019 May 17 15:33:19.396294 ospf 100 : : 10.2.0.1 also master,negotiation incomplete 2019 May 17 15:33:19.396290 ospf 100 : : seqnr 0x62475166, dbdbits 0x7, mtu 1500, options 0x42
I have to admit I've never seen this before and I tried to Google it but without success. Maybe some of you Cisco gurus out here can help me out?
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