Colleagues, We have found a very interesting problem.
There are a dozen routers connected to a common 10.65.127.224/27 L2 backbone. All are running OSPF area 0. Any router which has the IP address 10.65.127.246 cannot establish OSPF adjacency with some other routers, showing them forever in the INIT/DROTHER or EXSTART/DROTHER state. When a different IP address is configured on the same router, the problem is solved. More over, when 10.65.127.246 is configured on ANY router in the segment, it experiences adjacency problems. We are currently using a workaround of never assigning 10.65.127.246 to any router. Is this Sauron's IP address, or is there some kind of curse thereon? Below is a typical output sw-bptoik#sh ip ospf 12 neighbor Neighbor ID Pri State Dead Time Address Interface 10.65.127.7 130 2WAY/DROTHER 984 msec 10.65.127.249 Vlan22 10.65.127.9 130 FULL/DR 707 msec 10.65.127.250 Vlan22 10.65.127.10 1 2WAY/DROTHER 942 msec 10.65.127.248 Vlan22 10.65.127.12 1 2WAY/DROTHER 841 msec 10.65.127.252 Vlan22 10.65.127.13 1 INIT/DROTHER 942 msec 10.65.127.235 Vlan22 10.65.127.14 1 INIT/DROTHER 782 msec 10.65.127.245 Vlan22 10.65.127.15 130 INIT/DROTHER 908 msec 10.65.127.251 Vlan22 10.65.127.17 1 2WAY/DROTHER 866 msec 10.65.127.241 Vlan22 10.65.127.19 1 2WAY/DROTHER 959 msec 10.65.127.238 Vlan22 10.65.127.21 1 2WAY/DROTHER 740 msec 10.65.127.244 Vlan22 10.65.127.22 0 INIT/DROTHER 766 msec 10.65.127.243 Vlan22 10.65.127.23 1 2WAY/DROTHER 891 msec 10.65.127.230 Vlan22 10.65.127.24 1 2WAY/DROTHER 682 msec 10.65.127.231 Vlan22 10.65.155.11 1 2WAY/DROTHER 816 msec 10.65.127.253 Vlan22 172.16.146.11 1 2WAY/DROTHER 858 msec 10.65.127.247 Vlan22 sw-bptoik#sh ip ospf int Vlan22 Vlan22 is up, line protocol is up Internet Address 10.65.127.246/27, Area 0 Process ID 12, Router ID 10.65.127.246, Network Type BROADCAST, Cost: 1 Topology-MTID Cost Disabled Shutdown Topology Name 0 1 no no Base Transmit Delay is 1 sec, State DROTHER, Priority 1 Designated Router (ID) 10.65.127.9, Interface address 10.65.127.250 Backup Designated router (ID) 10.65.127.9, Interface address 10.65.127.250 Timer intervals configured, Hello 333 msec, Dead 1, Wait 1, Retransmit 5 oob-resync timeout 40 Hello due in 264 msec Supports Link-local Signaling (LLS) Cisco NSF helper support enabled IETF NSF helper support enabled Index 1/1, flood queue length 0 Next 0x0(0)/0x0(0) Last flood scan length is 1, maximum is 1 Last flood scan time is 0 msec, maximum is 0 msec Neighbor Count is 15, Adjacent neighbor count is 1 Adjacent with neighbor 10.65.127.9 (Designated Router) Suppress hello for 0 neighbor(s) -- Victor Sudakov, VAS4-RIPE, VAS47-RIPN sip:suda...@sibptus.tomsk.ru _______________________________________________ cisco-nsp mailing list cisco-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/