[c-nsp] Cursed IP address

Victor Sudakov vas at mpeks.tomsk.su
Wed Nov 26 04:23:08 EST 2014


Murat Kaipov wrote:
> Hello Victor.
> Very interesting issue. Can you provide "show ip ospf 12 database"
> issue like this can occur when you have 10.65.127.246 address on
> other device.

Here you are from two routers (sw-vertikos and Raskino):

sw-vertikos#sh ip ospf 12 neighbor

Neighbor ID     Pri   State           Dead Time   Address         Interface
10.65.127.7     130   2WAY/DROTHER    849 msec    10.65.127.249   Vlan22
10.65.127.9     130   FULL/DR         916 msec    10.65.127.250   Vlan22
10.65.127.10      1   2WAY/DROTHER    715 msec    10.65.127.248   Vlan22
10.65.127.12      1   2WAY/DROTHER    799 msec    10.65.127.252   Vlan22
10.65.127.13      1   INIT/DROTHER    690 msec    10.65.127.235   Vlan22
10.65.127.14      1   INIT/DROTHER    916 msec    10.65.127.245   Vlan22
10.65.127.15    130   INIT/DROTHER    682 msec    10.65.127.251   Vlan22
10.65.127.17      1   2WAY/DROTHER    900 msec    10.65.127.241   Vlan22
10.65.127.19      1   2WAY/DROTHER    774 msec    10.65.127.238   Vlan22
10.65.127.21      1   2WAY/DROTHER    883 msec    10.65.127.244   Vlan22
10.65.127.22      0   INIT/DROTHER    849 msec    10.65.127.243   Vlan22
10.65.127.23      1   2WAY/DROTHER    782 msec    10.65.127.230   Vlan22
10.65.127.24      1   2WAY/DROTHER    706 msec    10.65.127.231   Vlan22
10.65.155.11      1   2WAY/DROTHER    823 msec    10.65.127.253   Vlan22
172.16.146.11     1   2WAY/DROTHER    840 msec    10.65.127.247   Vlan22

sw-vertikos#sh ip ospf 12 interface vlan 22
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 46 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)


Raskino#sh ip ospf interface gi 0/2
GigabitEthernet0/2 is up, line protocol is up
  Internet Address 10.65.127.235/27, Area 0, Attached via Network Statement
  Process ID 10, Router ID 10.65.127.13, Network Type BROADCAST, Cost: 10
  Topology-MTID    Cost    Disabled    Shutdown      Topology Name
        0           10        no          no            Base
  Transmit Delay is 1 sec, State DROTHER, Priority 1
  Designated Router (ID) 10.65.127.15, Interface address 10.65.127.251
  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 112 msec
  Supports Link-local Signaling (LLS)
  Cisco NSF helper support enabled
  IETF NSF helper support enabled
  Index 3/3, flood queue length 0
  Next 0x0(0)/0x0(0)
  Last flood scan length is 0, maximum is 9
  Last flood scan time is 0 msec, maximum is 4 msec
  Neighbor Count is 14, Adjacent neighbor count is 2
    Adjacent with neighbor 10.65.127.9  (Backup Designated Router)
    Adjacent with neighbor 10.65.127.15  (Designated Router)
  Suppress hello for 0 neighbor(s)


Raskino#sh ip ospf database

            OSPF Router with ID (10.65.127.13) (Process ID 10)

                Router Link States (Area 0)

Link ID         ADV Router      Age         Seq#       Checksum Link count
10.65.127.7     10.65.127.7     418         0x8000005C 0x00CC30 13
10.65.127.9     10.65.127.9     657         0x80000031 0x003D08 6
10.65.127.10    10.65.127.10    274         0x80000059 0x00FD1D 6
10.65.127.12    10.65.127.12    1145        0x80000047 0x00078B 5
10.65.127.13    10.65.127.13    1876        0x80000035 0x001B1C 4
10.65.127.14    10.65.127.14    988         0x80000034 0x00F4C9 4
10.65.127.15    10.65.127.15    867         0x80000030 0x005DC0 4
10.65.127.16    10.65.127.16    666         0x80000030 0x00E590 3
10.65.127.17    10.65.127.17    672         0x80000031 0x00F1C1 4
10.65.127.18    10.65.127.18    742         0x80000030 0x009ED3 3
10.65.127.19    10.65.127.19    609         0x80000032 0x0039C7 5
10.65.127.21    10.65.127.21    1087        0x80000044 0x005B3F 3
10.65.127.22    10.65.127.22    609         0x80000033 0x004311 3
10.65.127.23    10.65.127.23    1504        0x80000040 0x00D793 3
10.65.127.24    10.65.127.24    1514        0x80000040 0x00F76F 3
10.65.127.246   10.65.127.246   271         0x80000003 0x00A084 1
10.65.155.11    10.65.155.11    1678        0x8000003D 0x006228 2
172.16.146.11   172.16.146.11   406         0x80000059 0x003FA2 6

                Net Link States (Area 0)

Link ID         ADV Router      Age         Seq#       Checksum
10.64.128.4     10.65.127.17    158         0x80000030 0x0009FE
10.65.127.38    10.65.127.15    867         0x8000002C 0x001502
10.65.127.133   10.65.127.10    535         0x8000002F 0x003981
10.65.127.251   10.65.127.15    350         0x80000072 0x00E9C1

                Type-5 AS External Link States

Link ID         ADV Router      Age         Seq#       Checksum Tag
0.0.0.0         10.65.127.7     677         0x8000002F 0x00F237 10
10.12.0.0       10.65.127.7     677         0x80000030 0x006B1E 0
10.14.128.0     10.65.127.7     677         0x80000030 0x000DFC 0
10.64.0.0       10.65.127.7     677         0x80000030 0x00EC6B 0
10.65.4.0       10.65.127.7     677         0x80000030 0x00B1A1 0
10.65.8.0       10.65.127.7     677         0x80000030 0x0071E1 0
10.65.165.0     10.65.127.7     677         0x80000030 0x00CEDF 0
172.16.210.0    10.65.127.7     677         0x80000030 0x00E926 0
-- 
Victor Sudakov,  VAS4-RIPE, VAS47-RIPN
sip:sudakov at sibptus.tomsk.ru


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