OSPF（show ip ospf database）
OSPFのトポロジデータベースの内容を確認するには、「show ip ospf database」コマンドを使用します。このコマンドで、トポロジデータベースの全体の概要を把握することができます。
●「show ip ospf database」の出力結果
Router_F#show ip ospf database
OSPF Router with ID (172.21.0.2) (Process ID 1)
Router Link States (Area 1) ← LSAタイプ1
Link ID ADV Router Age Seq# Checksum Link count
172.21.0.1 172.21.0.1 55 0x80000006 0xC86F 1
172.21.0.2 172.21.0.2 32 0x80000003 0xC96F 1
Net Link States (Area 1) ← LSAタイプ2
Link ID ADV Router Age Seq# Checksum
172.21.0.2 172.21.0.2 32 0x80000002 0xCE7C
Summary Net Link States (Area 1) ← LSAタイプ3
Link ID ADV Router Age Seq# Checksum
172.18.0.0 172.21.0.1 39 0x80000002 0xE5AA
172.19.0.0 172.21.0.1 39 0x80000004 0x9A13
172.20.0.0 172.21.0.1 39 0x80000002 0x2E8A
192.168.33.1 172.21.0.1 39 0x80000002 0xC527
Summary ASB Link States (Area 1) ← LSAタイプ4
Link ID ADV Router Age Seq# Checksum
172.18.0.1 172.21.0.1 39 0x80000002 0xCDC0
AS External Link States ← LSAタイプ5
Link ID ADV Router Age Seq# Checksum Tag
172.17.0.0 172.18.0.1 1790 0x80000003 0xCC04 0
192.168.1.0 172.18.0.1 1795 0x80000001 0xA580 0
192.168.2.0 172.18.0.1 1795 0x80000001 0x9A8A 0
192.168.3.0 172.18.0.1 1795 0x80000001 0x8F94 0
192.168.4.0 172.18.0.1 1795 0x80000001 0x849E 0
特定のLSAの情報を詳しく確認したい場合には、パラメータを指定します。
show ip ospf database router
LSAタイプ1のルータLSAを確認するには、「show ip ospf database router」で確認できます。
●「show ip ospf database router」の出力結果
Router_D#show ip ospf database router
OSPF Router with ID (172.20.0.1) (Process ID 1)
Router Link States (Area 0)
Routing Bit Set on this LSA
LS age: 392
Options: (No TOS-capability, DC)
LS Type: Router Links
Link State ID: 172.18.0.1
Advertising Router: 172.18.0.1
LS Seq Number: 80000003
Checksum: 0xCD54
Length: 48
AS Boundary Router
Number of Links: 2
Link connected to: another Router (point-to-point)
(Link ID) Neighboring Router ID: 172.19.0.1
(Link Data) Router Interface address: 172.18.0.1
Number of TOS metrics: 0
TOS 0 Metrics: 1562
Link connected to: a Stub Network
(Link ID) Network/subnet number: 172.18.0.0
(Link Data) Network Mask: 255.255.0.0
Number of TOS metrics: 0
TOS 0 Metrics: 1562
LS age: 103
Options: (No TOS-capability, DC)
LS Type: Router Links
Link State ID: 172.19.0.1
Advertising Router: 172.19.0.1
LS Seq Number: 80000004
Checksum: 0xE9A5
Length: 60
Number of Links: 3
Link connected to: a Transit Network
(Link ID) Designated Router address: 172.19.0.1
(Link Data) Router Interface address: 172.19.0.1
Number of TOS metrics: 0
TOS 0 Metrics: 1
Link connected to: another Router (point-to-point)
(Link ID) Neighboring Router ID: 172.18.0.1
(Link Data) Router Interface address: 172.18.0.2
Number of TOS metrics: 0
TOS 0 Metrics: 1562
Link connected to: a Stub Network
(Link ID) Network/subnet number: 172.18.0.0
(Link Data) Network Mask: 255.255.0.0
Number of TOS metrics: 0
TOS 0 Metrics: 1562
LS age: 102
Options: (No TOS-capability, DC)
LS Type: Router Links
Link State ID: 172.20.0.1
Advertising Router: 172.20.0.1
LS Seq Number: 80000004
Checksum: 0x479
Length: 60
Number of Links: 3
Link connected to: another Router (point-to-point)
(Link ID) Neighboring Router ID: 172.21.0.1
(Link Data) Router Interface address: 172.20.0.1
Number of TOS metrics: 0
TOS 0 Metrics: 1562
Link connected to: a Stub Network
(Link ID) Network/subnet number: 172.20.0.0
(Link Data) Network Mask: 255.255.0.0
Number of TOS metrics: 0
TOS 0 Metrics: 1562
Link connected to: a Transit Network
(Link ID) Designated Router address: 172.19.0.1
(Link Data) Router Interface address: 172.19.0.2
Number of TOS metrics: 0
TOS 0 Metrics: 10
Routing Bit Set on this LSA
LS age: 113
Options: (No TOS-capability, No DC)
LS Type: Router Links
Link State ID: 172.21.0.1
Advertising Router: 172.21.0.1
LS Seq Number: 80000005
Checksum: 0xC272
Length: 48
Area Border Router
Number of Links: 2
Link connected to: another Router (point-to-point)
(Link ID) Neighboring Router ID: 172.20.0.1
(Link Data) Router Interface address: 172.20.0.2
Number of TOS metrics: 0
TOS 0 Metrics: 1562
Link connected to: a Stub Network
(Link ID) Network/subnet number: 172.20.0.0
(Link Data) Network Mask: 255.255.0.0
Number of TOS metrics: 0
TOS 0 Metrics: 1562
show ip ospf database network
LSAタイプ2のネットワークLSAを確認するには、「show ip ospf database network」で確認できます。
●「show ip ospf database network」の出力結果
Router_D#show ip ospf database network
OSPF Router with ID (172.20.0.1) (Process ID 1)
Net Link States (Area 0)
Routing Bit Set on this LSA
LS age: 1590
Options: (No TOS-capability, DC)
LS Type: Network Links
Link State ID: 172.19.0.2 (address of Designated Router)
Advertising Router: 172.20.0.1
LS Seq Number: 80000002
Checksum: 0xE84A
Length: 32
Network Mask: /16
Attached Router: 172.20.0.1
Attached Router: 172.19.0.1show ip ospf database summary
LSAタイプ3のネットワークLSAを確認するには、「show ip ospf database summary」で確認できます。
●「show ip ospf database summary」の出力結果
Router_D#show ip ospf database summary
OSPF Router with ID (172.20.0.1) (Process ID 1)
Summary Net Link States (Area 0)
Routing Bit Set on this LSA
LS age: 64
Options: (No TOS-capability, No DC)
LS Type: Summary Links(Network)
Link State ID: 172.21.0.0 (summary Network Number)
Advertising Router: 172.21.0.1
LS Seq Number: 80000005
Checksum: 0x4585
Length: 28
Network Mask: /16
TOS: 0 Metric: 10
show ip ospf database asbr-summary
LSAタイプ4のネットワークLSAを確認するには、「show ip ospf database asbr-summary」で確認できます。
●「show ip ospf database asbr-summary」の出力結果
Router_F#show ip ospf database asbr-summary
OSPF Router with ID (172.21.0.2) (Process ID 1)
Summary ASB Link States (Area 1)
Routing Bit Set on this LSA
LS age: 171
Options: (No TOS-capability)
LS Type: Summary Links(AS Boundary Router)
Link State ID: 172.18.0.1 (AS Boundary Router address)
Advertising Router: 172.21.0.1
LS Seq Number: 80000002
Checksum: 0xCDC0
Length: 28
Network Mask: /0
TOS: 0 Metric: 3134
show ip ospf database external
LSAタイプ5のネットワークLSAを確認するには、「show ip ospf database external」で確認できます。
●「show ip ospf database external」の実行結果
Router_F#show ip ospf database external
OSPF Router with ID (172.21.0.2) (Process ID 1)
AS External Link States
Routing Bit Set on this LSA
LS age: 1414
Options: (No TOS-capability)
LS Type: AS External Link
Link State ID: 172.16.0.0 (External Network Number )
Advertising Router: 172.18.0.1
LS Seq Number: 80000002
Checksum: 0xFD66
Length: 36
Network Mask: /16
Metric Type: 2 (Larger than any link state path)
TOS: 0
Metric: 20
Forward Address: 172.17.0.1
External Route Tag: 0
show ip ospf database nssa-external
LSAタイプ5のネットワークLSAを確認するには、「show ip ospf database nssa-external」で確認できます。
●「show ip ospf database nssa-external」の出力結果
Router_F#show ip ospf database nssa-external
OSPF Router with ID (192.168.65.1) (Process ID 1)
Type-7 AS External Link States (Area 1)
Routing Bit Set on this LSA
LS age: 34
Options: (No TOS-capability, No Type 7/5 translation, DC)
LS Type: AS External Link
Link State ID: 0.0.0.0 (External Network Number )
Advertising Router: 172.21.0.1
LS Seq Number: 80000001
Checksum: 0x4CA2
Length: 36
Network Mask: /0
Metric Type: 2 (Larger than any link state path)
TOS: 0
Metric: 1
Forward Address: 0.0.0.0
External Route Tag: 0
LS age: 1270
Options: (No TOS-capability, Type 7/5 translation, DC)
LS Type: AS External Link
Link State ID: 192.168.65.0 (External Network Number )
Advertising Router: 192.168.65.1
LS Seq Number: 80000001
Checksum: 0xA08B
Length: 36
Network Mask: /24
Metric Type: 2 (Larger than any link state path)
TOS: 0
Metric: 100
Forward Address: 172.21.0.2
External Route Tag: 0
次の「OSPF（確認コマンド）」では、OSPFの設定や正しく動作していることを確認するためのコマンドを解説します。