CCNP TSHOOT CHAPTER 8 (OSPF)

CCNP TSHOOT CHAPTER 8 (OSPF)
14. To form full ospf adjacency which attributes of ospf must match ?
15. List out ospf verification commands .
16. List out all points if ospf routes are not installed in routing table.
Solution:
14. To form full ospf adjacency which attributes of ospf must match ?
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1. Subnet/Mask (except for P2P or Virtual link)
2. Area
3. Timers
4. Different Router IDs
5. Flags (Stub , NSSA)
6. MTU
7. Authentication type ( 0-null ,1-pliantext ,2-MD5)
8. Compatible Network Types ( To DR or not to DR)

15. List out ospf verification commands .
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#sh ip ospf |  be area 1
# sh ip ospf int brief
# sh ip ospf neighbor

R1#sh ip ospf | be Area
    Area BACKBONE(0)
        Number of interfaces in this area is 2 (1 loopback)
        Area has no authentication
        SPF algorithm last executed 00:00:54.308 ago
        SPF algorithm executed 3 times
        Area ranges are
        Number of LSA 4. Checksum Sum 0x01D6C0
        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

R1#sh ip ospf interface brief
Interface    PID   Area            IP Address/Mask    Cost  State Nbrs F/C
Lo1          1     0               1.1.1.1/32         1     LOOP  0/0
Fa0/0        1     0               10.1.1.1/24        10    DR    2/2

R1#sh ip ospf neighbor

Neighbor ID     Pri   State           Dead Time   Address         Interface
3.3.3.3           1   FULL/BDR        00:00:38    10.1.1.3        FastEthernet0/0
4.4.4.4           1   FULL/DROTHER    00:00:32    10.1.1.4        FastEthernet0/0

16. List out all points if ospf routes are not installed in routing table.
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1. Interface shut down.
2. Missing network/interface statements.
3. Incorrect redistribution.
4. Distribute lists/filters
5. Network types between neighbors.
6. Improper network design.
7. Summarization (Stub, manual summary)

R1#sh ip ospf database self-originate

            OSPF Router with ID (1.1.1.1) (Process ID 1)

                Router Link States (Area 0)

Link ID         ADV Router      Age         Seq#       Checksum Link count
1.1.1.1         1.1.1.1         196         0x80000002 0x008071 2

                Net Link States (Area 0)

Link ID         ADV Router      Age         Seq#       Checksum
10.1.1.1        1.1.1.1         143         0x80000002 0x00A55E

R1#sh ip ospf database router 1.1.1.1

            OSPF Router with ID (1.1.1.1) (Process ID 1)

                Router Link States (Area 0)

  LS age: 222
  Options: (No TOS-capability, DC)
  LS Type: Router Links
  Link State ID: 1.1.1.1
  Advertising Router: 1.1.1.1
  LS Seq Number: 80000002
  Checksum: 0x8071
  Length: 48
  Number of Links: 2

    Link connected to: a Stub Network
     (Link ID) Network/subnet number: 1.1.1.1
     (Link Data) Network Mask: 255.255.255.255
      Number of TOS metrics: 0
       TOS 0 Metrics: 1

    Link connected to: a Transit Network
     (Link ID) Designated Router address: 10.1.1.1
     (Link Data) Router Interface address: 10.1.1.1
      Number of TOS metrics: 0
       TOS 0 Metrics: 10


R1#sh ip route 3.3.3.3
Routing entry for 3.3.3.3/32
  Known via "ospf 1", distance 110, metric 11, type intra area
  Last update from 10.1.1.3 on FastEthernet0/0, 00:05:55 ago
  Routing Descriptor Blocks:
  * 10.1.1.3, from 3.3.3.3, 00:05:55 ago, via FastEthernet0/0
      Route metric is 11, traffic share count is 1