<div dir="ltr"><div><div>Hello, thank you for your help. </div><div><br></div><div>The next day after the failure, I restart ospf_business on faulty r2. Discovery can be seen from r0 sent over the default route on r2 routing table. I was very surprised, and why? Next, how do I troubleshoot? </div>
<div><br></div><div>r0 is a Layer 3 switch. </div><div><br></div><div>The following is the recovery seen in r0-2 status. </div><div><br></div><div>r1: </div><div><br></div><div>bird> show ospf state all ospf_business </div>
<div>1016 - </div><div> area 0.0.0.20 </div><div> </div><div> router x.y.z.1 </div><div> distance 10 </div><div> network x.y.z.0/28 metric 1 </div><div> external 0.0.0.0 / 0 metric2 1 tag 00000001 </div>
<div> </div><div> router x.y.z.3 </div><div> distance 0 </div><div> network x.y.z.0/28 metric 10 </div><div> external a.b.c.d/25 metric2 20 via x.y.z.1 </div><div> </div><div> network x.y.z.0/28 </div>
<div> dr x.y.z.3 </div><div> distance 10 </div><div> router x.y.z.3 </div><div> router x.y.z.1 </div><div><br></div><div>r2: </div><div><br></div><div>bird> show ospf state all ospf_business </div><div>
1016 - </div><div> area 0.0.0.30 </div><div> </div><div> router x.y.z.17 </div><div> distance 10 </div><div> network x.y.z.16/28 metric 1 </div><div> external 0.0.0.0 / 0 metric2 1 tag 00000001 </div>
<div> </div><div> router x.y.z.19 </div><div> distance 0 </div><div> network x.y.z.16/28 metric 10 </div><div> </div><div> network x.y.z.16/28 </div><div> dr x.y.z.17 </div><div> distance 10 </div>
<div> router x.y.z.17 </div><div> router x.y.z.19 </div><div><br></div><div>r0: </div><div><br></div><div><r0-switch> display ospf brief </div><div><br></div><div>OSPF Process 100 with Router ID x.y.z.1 </div>
<div>OSPF Protocol Information </div><div><br></div><div> RouterID: x.y.z.1 Border Router: AS </div><div> Multi-VPN-Instance is not enabled </div><div> Graceful-restart capability: disabled </div><div> Helper support capability: not configured </div>
<div> Spf-schedule-interval: max 10000ms, start 500ms, hold 1000ms </div><div> Default ASE parameters: Metric: 1 Tag: 1 Type: 2 </div><div> Route Preference: 10 </div><div> ASE Route Preference: 150 </div><div> SPF Computation Count: 62 </div>
<div> RFC 1583 Compatible </div><div> Retransmission limitation is disabled </div><div> Area Count: 1 Nssa Area Count: 0 </div><div> ExChange / Loading Neighbors: 0 </div><div> Process total up interface count: 1 </div><div>
Process valid up interface count: 1 </div><div> </div><div> Area: 0.0.0.20 </div><div> Authtype: None Area flag: Normal </div><div> SPF scheduled Count: 62 </div><div> ExChange / Loading Neighbors: 0 </div><div> Router ID conflict state: Normal </div>
<div> Area interface up count: 1 </div><div><br></div><div> Interface: x.y.z.1 (Vlanif3) </div><div> Cost: 1 State: BDR Type: Broadcast MTU: 1500 </div><div> Priority: 1 </div><div> Designated Router: x.y.z.3 </div><div> Backup Designated Router: x.y.z.1 </div>
<div> Timers: Hello 10, Dead 40, Poll 120, Retransmit 5, Transmit Delay 1 </div><div><br></div><div>OSPF Process 200 with Router ID x.y.z.17 </div><div>OSPF Protocol Information </div><div><br></div><div> RouterID: x.y.z.17 Border Router: AS </div>
<div> Multi-VPN-Instance is not enabled </div><div> Graceful-restart capability: disabled </div><div> Helper support capability: not configured </div><div> Spf-schedule-interval: max 10000ms, start 500ms, hold 1000ms </div>
<div> Default ASE parameters: Metric: 1 Tag: 1 Type: 2 </div><div> Route Preference: 10 </div><div> ASE Route Preference: 150 </div><div> SPF Computation Count: 53 </div><div> RFC 1583 Compatible </div><div> Retransmission limitation is disabled </div>
<div> Area Count: 1 Nssa Area Count: 0 </div><div> ExChange / Loading Neighbors: 0 </div><div> Process total up interface count: 1 </div><div> Process valid up interface count: 1 </div><div> </div><div> Area: 0.0.0.30 </div>
<div> Authtype: None Area flag: Normal </div><div> SPF scheduled Count: 53 </div><div> ExChange / Loading Neighbors: 0 </div><div> Router ID conflict state: Normal </div><div> Area interface up count: 1 </div><div><br></div>
<div> Interface: x.y.z.17 (Vlanif4) </div><div> Cost: 1 State: DR Type: Broadcast MTU: 1500 </div><div> Priority: 1 </div><div> Designated Router: x.y.z.17 </div><div> Backup Designated Router: x.y.z.19 </div><div> Timers: Hello 10, Dead 40, Poll 120, Retransmit 5, Transmit Delay 1 </div>
<div><br></div><div>The following is r0 configurations: </div><div><br></div><div>interface Vlanif3 </div><div> ip address x.y.z.1 255.255.255.240 </div><div> ospf authentication-mode md5 1 cipher pass1 </div><div># </div>
<div>interface Vlanif4 </div><div> ip address x.y.z.17 255.255.255.240 </div><div> ospf authentication-mode md5 1 cipher pass2 </div><div><br></div><div># </div><div>ospf 100 router-id x.y.z.1 </div><div> description business about bussiness1 </div>
<div> default-route-advertise </div><div> area 0.0.0.20 </div><div> network x.y.z.0 0.0.0.15 </div><div># </div><div>ospf 200 router-id x.y.z.17 </div><div> description business about bussiness2 </div><div> default-route-advertise </div>
<div> area 0.0.0.30 </div><div> network x.y.z.16 0.0.0.15 </div><div># </div><div>ip route-static 0.0.0.0 0.0.0.0 q.w.e.r </div></div></div>