OSPF database command show

NOTE: trong ospf gia tri cost = outing interface

1. Show ip ospf database router

R1#show ip os da router 3.3.3.3             OSPF Router with ID (1.1.1.1) (Process ID 1)                 Router Link States (Area 0)   LS age: 267   Options: (No TOS-capability, DC)   LS Type: Router Links   Link State ID: 3.3.3.3   Advertising Router: 3.3.3.3   LS Seq Number: 80000004   Checksum: 0xE4E5   Length: 48   Number of Links: 2     Link connected to: a Stub Network      (Link ID) Network/subnet number: 3.3.3.3      (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: 10.1.123.3      (Link Data) Router Interface address: 10.1.123.3       Number of TOS metrics: 0        TOS 0 Metrics: 30

Command " show ip ospf database router {X} "  type 1 LSA. cho thay duoc gia tri cost tu router X den router dang show

Cost R3 -> R1 = 30

2. show ip os da router self-originate

R1#show ip os da router self-originate             OSPF Router with ID (1.1.1.1) (Process ID 1)                 Router Link States (Area 0)   LS age: 466   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: 80000003   Checksum: 0xAC4D   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: 10.1.123.3      (Link Data) Router Interface address: 10.1.123.1       Number of TOS metrics: 0        TOS 0 Metrics: 10

Show LSA sinh ra boi no, va gia tri cost cua no den cac router ben canh.

Cost R1 -> R3 = 10

3. show ip os da network

R1#show ip os da network             OSPF Router with ID (1.1.1.1) (Process ID 1)                 Net Link States (Area 0)   Routing Bit Set on this LSA   LS age: 650   Options: (No TOS-capability, DC)   LS Type: Network Links   Link State ID: 10.1.123.3 (address of Designated Router)   Advertising Router: 3.3.3.3   LS Seq Number: 80000001   Checksum: 0x6F19   Length: 36   Network Mask: /24         Attached Router: 3.3.3.3         Attached Router: 1.1.1.1         Attached Router: 2.2.2.2

Command show type 2 LSA, cho biet cac router attack trong multiaccess. Router DR

DR: 10.1.123.3

4. show ip os da summary

R1#show ip os da summary 4.4.4.4             OSPF Router with ID (1.1.1.1) (Process ID 1)                 Summary Net Link States (Area 0)   Routing Bit Set on this LSA   LS age: 773   Options: (No TOS-capability, DC, Upward)   LS Type: Summary Links(Network)   Link State ID: 4.4.4.4 (summary Network Number)   Advertising Router: 2.2.2.2   LS Seq Number: 80000001   Checksum: 0x67A8   Length: 28   Network Mask: /32         TOS: 0  Metric: 21

Command show type 3 LSA. Cho biet advertise router hay  va gia tri cost tu advertise router ABR - > no

Cost  R2 - > 4.4.4.4 = R2->R4 + R4-> 4.4.4.4 = 20 + 1 = 21

5. Show ip ospf da ex {X}

R1#show ip os da ex 5.5.5.5             OSPF Router with ID (1.1.1.1) (Process ID 1)                 Type-5 AS External Link States   Routing Bit Set on this LSA   LS age: 48   Options: (No TOS-capability, DC)   LS Type: AS External Link   Link State ID: 5.5.5.5 (External Network Number )   Advertising Router: 4.4.4.4   LS Seq Number: 80000003   Checksum: 0x7656   Length: 36   Network Mask: /32         Metric Type: 1 (Comparable directly to link state metric)         TOS: 0         Metric: 5         Forward Address: 10.1.45.5         External Route Tag: 0

Command show type 5 LSA. Cho biet router ASBR advertise, gia tri metric tu 5.5.5.5 -> ASBR

Hay gia tri advertise = 5

Cost 5.5.5.5 -> ASBR = 5

6. show ip os da asbr-summary

show ip os da asbr-summary 4.4.4.4             OSPF Router with ID (1.1.1.1) (Process ID 1)                 Summary ASB Link States (Area 0)   Routing Bit Set on this LSA   LS age: 1370   Options: (No TOS-capability, DC, Upward)   LS Type: Summary Links(AS Boundary Router)   Link State ID: 4.4.4.4 (AS Boundary Router address)   Advertising Router: 2.2.2.2   LS Seq Number: 80000001   Checksum: 0x4FC0   Length: 28   Network Mask: /0         TOS: 0  Metric: 20

Command  cho biet gia tri cost tu ABR-> ASBR

Cost R2 -> R4 = 20

7. Show ip route 5.5.5.5

R1#show ip route 5.5.5.5 Routing entry for 5.5.5.5/32   Known via "ospf 1", distance 110, metric 40, type extern 1   Last update from 10.1.123.2 on FastEthernet0/0, 00:00:46 ago   Routing Descriptor Blocks:   * 10.1.123.2, from 4.4.4.4, 00:00:46 ago, via FastEthernet0/0       Route metric is 40, traffic share count is 1

R1-> 5.5.5.5 = R1-R2 + R2-R4 + R4- + adverstise metric

 = 10 + 20 + 5 + 5 = 40  (vi tren cong f0/1 R4 run ospf vs cost = 5)

Disable ospf in f0/0 R4.

R1#show ip route 5.5.5.5 Routing entry for 5.5.5.5/32   Known via "ospf 1", distance 110, metric 35, type extern 1   Last update from 10.1.123.2 on FastEthernet0/0, 00:01:06 ago   Routing Descriptor Blocks:   * 10.1.123.2, from 4.4.4.4, 00:01:06 ago, via FastEthernet0/0       Route metric is 35, traffic share count is 1

R1-> 5.5.5.5 = R1-R2 + R2-R4 + advertise

 = 10 + 20 + 5 = 35

8. Config area 1 nssa

Show ip os data nssa

R2#show ip os database nssa-external 5.5.5.5             OSPF Router with ID (2.2.2.2) (Process ID 1)                 Type-7 AS External Link States (Area 1)   Routing Bit Set on this LSA   LS age: 113   Options: (No TOS-capability, Type 7/5 translation, DC)   LS Type: AS External Link   Link State ID: 5.5.5.5 (External Network Number )   Advertising Router: 4.4.4.4   LS Seq Number: 80000001   Checksum: 0xA24F   Length: 36   Network Mask: /32         Metric Type: 1 (Comparable directly to link state metric)         TOS: 0         Metric: 5         Forward Address: 4.4.4.4         External Route Tag: 0

Command show type 7 LSA. Cho biet gia tri cost adver vao tu ASBR

Cost 5.5.5.5 -> R4 = 5