Small step toward , repaired the ospf adjency between the Nexus pair. They see each other (int vlan 2 down..) But the CoreAB OSPF process doesn't see the Nexus switches. TEST_N5k-primary# sh ip ospf neighbor OSPF Process ID 1 VRF default Total number of neighbors: 1 Neighbor ID Pri State Up Time Address Interface 2.2.2.2 1 FULL/BDR 00:09:39 10.58.16.2 Vlan2 TEST_N5k-secondary# sh ip ospf neighbor OSPF Process ID 1 VRF default Total number of neighbors: 1 Neighbor ID Pri State Up Time Address Interface 1.1.1.1 1 FULL/DR 00:10:36 10.58.16.1 Vlan2 CoreAB TEST_CoreAB#sh ip ospf Routing Process "ospf 1" with ID 192.168.11.246 Start time: 00:04:22.185, Time elapsed: 00:14:05.537 Supports only single TOS(TOS0) routes Supports opaque LSA Supports Link-local Signaling (LLS) Supports area transit capability Supports NSSA (compatible with RFC 3101) Supports Database Exchange Summary List Optimization (RFC 5243) Event-log enabled, Maximum number of events: 1000, Mode: cyclic It is an autonomous system boundary router Redistributing External Routes from, static, includes subnets in redistribution Router is not originating router-LSAs with maximum metric Initial SPF schedule delay 5000 msecs Minimum hold time between two consecutive SPFs 10000 msecs Maximum wait time between two consecutive SPFs 10000 msecs Incremental-SPF disabled Minimum LSA interval 5 secs Minimum LSA arrival 1000 msecs LSA group pacing timer 240 secs Interface flood pacing timer 33 msecs Retransmission pacing timer 66 msecs EXCHANGE/LOADING adjacency limit: initial 300, process maximum 300 Number of external LSA 0. Checksum Sum 0x000000 Number of opaque AS LSA 0. Checksum Sum 0x000000 Number of DCbitless external and opaque AS LSA 0 Number of DoNotAge external and opaque AS LSA 0 Number of areas in this router is 1. 1 normal 0 stub 0 nssa Number of areas transit capable is 0 External flood list length 0 IETF NSF helper support enabled Cisco NSF helper support enabled Reference bandwidth unit is 100 mbps Area BACKBONE(0) (Inactive) Number of interfaces in this area is 1 Area has no authentication SPF algorithm last executed 00:13:11.570 ago SPF algorithm executed 2 times Area ranges are Number of LSA 1. Checksum Sum 0x00BF42 Number of opaque link LSA 0. Checksum Sum 0x000000 Number of DCbitless LSA 0 Number of indication LSA 0 Number of DoNotAge LSA 0 Flood list length 0 TEST_CoreAB#sh ip ospf route OSPF Router with ID (192.168.11.246) (Process ID 1) Base Topology (MTID 0) Area BACKBONE(0) Intra-area Route List * 10.58.16.3/32, Intra, cost 0, area 0, Connected via 10.58.16.3, Vlan2 First Hop Forwarding Gateway Tree 10.58.16.3 on Vlan2, count 1 TEST_CoreAB(config)#do sh ip ospf 1 int vlan 2 Vlan2 is up, line protocol is up Internet Address 10.58.16.3/29, Area 0, Attached via Interface Enable Process ID 1, Router ID 192.168.11.246, Network Type BROADCAST, Cost: 1 Topology-MTID Cost Disabled Shutdown Topology Name 0 1 no no Base Enabled by interface config, including secondary ip addresses Transmit Delay is 1 sec, State DR, Priority 1 Designated Router (ID) 192.168.11.246, Interface address 10.58.16.3 No backup designated router on this network Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5 oob-resync timeout 40 Hello due in 00:00:02 Supports Link-local Signaling (LLS) Cisco NSF helper support enabled IETF NSF helper support enabled Index 1/1/1, flood queue length 0 Next 0x0(0)/0x0(0)/0x0(0) Last flood scan length is 0, maximum is 0 Last flood scan time is 0 msec, maximum is 0 msec Neighbor Count is 0, Adjacent neighbor count is 0 Suppress hello for 0 neighbor(s) I don't know why inactive area 0 on CoreAB.
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