show ip ospf database detail
Use this command to display details of the OSPF database.
Command Syntax
show ip ospf database (asbr-summary|external|network|router|summary|nssa-external|opaque-link|opaque-area|opaque-as) (self-originate|adv-router A.B.C.D|)
show ip ospf <0-65535> database (asbr-summary|external|network|router|summary) (self-originate|adv-router A.B.C.D|)
show ip ospf database (asbr-summary|external|network|router|summary|nssa-external|opaque-link|opaque-area|opaque-as) A.B.C.D (self-originate|adv-router A.B.C.D|)
show ip ospf <0-65535> database (asbr-summary|external|network|router|summary|nssa-external|opaque-link|opaque-area|opaque-as) A.B.C.D (self-originate|adv-router A.B.C.D|)
Parameters
<0-65535>
The ID of the router process for which information should be displayed.
asbr-summary
Type 4 ASBR summary LSAs.
external
Type 5 external LSAs.
network
Type 2 network LSAs.
router
Type 1 router LSAs.
summary
Type 3 summary LSAs.
nssa-external
Type 7 NSSA external LSAs.
opaque-link
Type 9 LSAs which are not flooded beyond the local network.
opaque-area
Type 10 LSAs which are not flooded beyond the borders of their area.
opaque-as
Type 11 LSAs which are flooded throughout the AS.
A.B.C.D
Link state ID as an IP address.
self-originate
Display self-originated link states.
adv-router
Advertising router link states.
A.B.C.D
IPv4 address of advertising router.
Command Mode
Privileged Exec mode
Applicability
This command was introduced before OcNOS version 1.3.
Example: external and self-originate Parameters
This is sample output with the external and self-originate parameters.
#show ip ospf database external self-originate
OSPF Router process 100 with ID (10.10.11.50)
AS External Link States
LS age: 298
Options: 0x2 (*|-|-|-|-|-|E|-)
LS Type: AS-external-LSA
Link State ID: 10.10.100.0 (External Network Number)
Advertising Router: 10.10.11.50
LS Seq Number: 80000001
Checksum: 0x7033
Length: 36
Network Mask: /24
Metric Type: 2 (Larger than any link state path)
TOS: 0
Metric: 20
Forward Address: 10.10.11.50
External Route Tag: 0
Example: opaque-as and self-originate Parameters
This is sample output with the opaque-as and self-originate parameters.
#show ip ospf database opaque-as self-originate
OSPF Router process 100 with ID (10.10.11.50)
AS-Global Opaque-LSA
LS age: 325
Options: 0x2 (*|-|-|-|-|-|E|-)
LS Type: AS-external Opaque-LSA
Link State ID: 11.10.9.23 (AS-external Opaque-Type/ID)
Opaque Type: 11
Opaque ID: 657687
Advertising Router: 10.10.11.50
LS Seq Number: 80000001
Checksum: 0xb018
Length: 25
Example: adv-router Parameter
This is a sample output with the adv-router parameter.
#show ip ospf database nssa-external adv-router 10.10.11.50
OSPF Router process 100 with ID (10.10.11.50)
NSSA-external Link States (Area 0.0.0.0)
NSSA-external Link States (Area 0.0.0.1 [NSSA])
LS age: 78
Options: 0x0 (*|-|-|-|-|-|-|-)
LS Type: AS-NSSA-LSA
Link State ID: 0.0.0.0 (External Network Number For NSSA)
Advertising Router: 10.10.11.50
LS Seq Number: 80000001
Checksum: 0xc9b6
Length: 36
Network Mask: /0
Metric Type: 2 (Larger than any link state path)
TOS: 0
Metric: 1
NSSA: Forward Address: 0.0.0.0
OSPF Router process 100 with ID (10.10.11.50)
NSSA-external Link States (Area 0.0.0.0)
NSSA-external Link States (Area 0.0.0.1 [NSSA])
LS age: 78
Options: 0x0 (*|-|-|-|-|-|-|-)
LS Type: AS-NSSA-LSA
Link State ID: 0.0.0.0 (External Network Number For NSSA)
Example: router and Link State ID Parameters
This is sample output with the router and link state ID parameters.
#show ip ospf database router 10.10.11.50
OSPF Router process 100 with ID (10.10.11.50)
Router Link States (Area 0.0.0.0)
LS age: 878
Options: 0x2 (*|-|-|-|-|-|E|-)
Flags: 0x3 : ABR ASBR
LS Type: router-LSA
Link State ID: 10.10.11.50
Advertising Router: 10.10.11.50
LS Seq Number: 80000004
Checksum: 0xe39e
Length: 36
Number of Links: 1
Link connected to: Stub Network
(Link ID) Network/subnet number: 10.10.10.0
(Link Data) Network Mask: 255.255.255.0
Number of TOS metrics: 0
TOS 0 Metric: 10
Router Link States (Area 0.0.0.1)
LS age: 877
Options: 0x2 (*|-|-|-|-|-|E|-)
Flags: 0x3 : ABR ASBR
LS Type: router-LSA
Link State ID: 10.10.11.50
Advertising Router: 10.10.11.50
LS Seq Number: 80000003
Example: adv-router Parameter
This is sample output using the adv-router parameter for flood reduction.
#show ip ospf database summary adv-router 10.10.11.50
OSPF Router process 100 with ID (10.10.11.50)
Summary Link States (Area 0.0.0.0)
LS age: 1(DoNotAge)
Options: 0x2 (*|-|-|-|-|-|E|-)
LS Type: summary-LSA
Link State ID: 10.10.11.0 (summary Network Number)
Advertising Router: 10.10.11.50
LS Seq Number: 80000001
Checksum: 0x36ac
Length: 28
Network Mask: /24
TOS: 0 Metric: 10
Summary Link States (Area 0.0.0.1)
LS age: 989
Options: 0x2 (*|-|-|-|-|-|E|-)
LS Type: summary-LSA
Link State ID: 10.10.11.0 (summary Network Number)
Advertising Router: 10.10.11.50
LS Seq Number: 80000001
Checksum: 0x36ac
Length: 28
Network Mask: /24
TOS: 0 Metric: 10
#show ip ospf database external self-originate
OSPF Router process 100 with ID (10.10.11.50)
AS External Link States
LS age: 298
Options: 0x2 (*|-|-|-|-|-|E|-)
LS Type: AS-external-LSA
Link State ID: 10.10.100.0 (External Network Number)
Advertising Router: 10.10.11.50
LS Seq Number: 80000001
Checksum: 0x7033
Length: 36
Network Mask: /24
Metric Type: 2 (Larger than any link state path)
TOS: 0
Metric: 20
Forward Address: 10.10.11.50
External Route Tag: 0
Database Detail Header Fields
Table 1-8 explains the fields for each database entry.
Table 1-8: ospf database detail header fields
Field | Description |
|---|
LS age | Age of the LSA in seconds. “Do Not Age” is displayed if the DNA bit is set. |
Options | LSA options as explained in Table 1-9. |
Flags | ABR: Area border router ASBR: AS boundary router VL-endpoint: Endpoint of an active virtual link that is using the described area as a transit area Shortcut: shortcut ABR NSSA-Translator: NSSA border router with NSSA Translate or State enabled |
LS Type | Type of LSA: Router-LSA Network-LSA Summary-LSA ASBR-summary-LSA AS-external-LSA AS-NSSA-LSA Link-Local Opaque-LSA Area-Local Opaque-LSA AS-external Opaque-LSA |
Link State ID | Identifier of the router described by the LSA. |
Opaque Type | Opaque type used to identify the application type of the LSA: 9: link-local scope 10: area-local scope 11: LSA flooded throughout the AS |
Opaque ID | Identifier used to differentiate LSAs of the same type. |
Advertising Router | Identifier of the router that originated the LSA. |
LS Seq Number | Sequence number of the LSA. This number increments each time a new instance of the LSA originates. This update helps other routers identify the most recent instance of the LSA. |
Checksum | Checksum of the entire LSA, except the LS age field. |
Length | Length of the LSA |
I LSA | Indication LSA: ASBR set the infinity metric to tell all routers in the backbone not to originate DNA LSAs. |
OSPF LSA Option Bits
Table 1-9 explains the fields for each database entry.
Table 1-9: ospf LSA option bits output details
Bit | Description |
|---|
DN | Used in MPLS-based L3 VPNs. When a route learned from a customer network via OSPF is advertised across a BGP/MPLS VPN using Multiprotocol BGP and advertised back to a customer network via OSPF, a loop can happen where the OSPF route is redistributed back to the VPN service provider network via BGP. The DN-bit prevents this type of routing loop. When an OSPF router receives a Type 3, 5, or 7 LSA with the DN-bit set, it foes use that LSA for OSPF route calculations. |
O | Originating router supports Type 9, 10, and 11 Opaque LSAs. |
DC | Originating router supports OSPF over Demand Circuits. |
L | Whether the OSPF packet contains a Link-Local Signaling (LLS) data block. This bit is set only in Hello and database description packets. |
N/P | The N-bit is used only in Hello packets when the originating router supports Type-7 NSSA-External-LSAs. Neighboring routers with mismatched N-bit will not form a neighbor relationship. This restriction ensures that all OSPF routers within an area support NSSA capabilities. When the N-bit is set, the E-bit must be 0. The P-bit is used only in Type-7 NSSA-External-LSA headers. Due to this reason, the N- and P-bits share the same position in the options field. The P (Propagate) bit is set to inform an NSSA ABR to translate Type-7 LSAs into Type-5 LSAs. |
MC | Originating router supports multicast extensions to OSPF (MOSPF) |
E | Originating router accepts AS External LSAs. The bit is set in all AS External LSAs and in all LSAs originated in the backbone and non-stub areas; and is be set to 0 in all Hellos and LSAs originated within a stub area. Additionally, this bit is used in Hello packets to indicate the capability of a router interface to send and receive Type-5 AS-External-LSAs. Neighboring routers with mismatched E-bit do not form a neighbor relationship. This restriction ensures that all OSPF routers within an area support the stub capabilities. |
T | Originating router supports Multitopology OSPF (MT-OSPF.) Older OSPF specifications used this bit when the originating router support TOS-based routing. However, OSPF TOS-based routing was never deployed; therefore the T-bit was never used. |
Type 1 Router LSAs (“router” Parameter)
Table 1-10 explains the fields for each database entry.
Table 1-10: router LSAs
Field | Description |
|---|
Number of Links | Number of router links the LSA describes. |
Link connected to | Description of the router link: another Router (point-to-point) a Transit Network Stub Network a Virtual Link |
(Link ID) | Identifier of the router to which the link connects: Neighboring Router ID Designated Router address Network/subnet number Neighboring Router ID |
(Link Data) | Extra information: Router Interface address Network Mask |
Number of TOS metrics | Number of TOS (Type of Service) metrics for this link, not including the metric for TOS 0. |
TOS 0 Metric | Cost of using this router link for TOS 0. |
Type 2 Net Link States (“network” Parameter)
Table 1-11 explains the fields for each database entry.
Table 1-11: net LSAs
Field | Description |
|---|
Network Mask | IP address mask for the network. |
Attached Router | Identifiers of each router attached to the network. |
Type 3 Summary LSAs (“summary” Parameter) and Type 4 ASBR Summary LSAs (“asbr-summary” Parameter)
Table 1-12 explains the fields for each database entry.
Table 1-12: summary and ASBR summary link states
Field | Description |
|---|
Network Mask | For Type 3 LSAs, the destination network's IP address mask. Not meaningful for Type 4 link state advertisements. |
TOS: 0 Metric | Cost of using this router link for TOS 0. |
Type 5 AS External LSAs (“external” Parameter)
Table 1-13 explains the fields for each database entry.
Table 1-13: external LSAs
Field | Description |
|---|
Network Mask | IP address mask for the advertised destination |
Metric Type | 1: Type 1 external metric that is comparable directly (without translation) to the link state metric 2: Type 2 external metric that is considered larger than any link state path |
TOS | Always zero. |
Metric | The cost of this route. |
Forward Address | Data traffic for the advertised destination is forwarded to this address. |
External Route Tag | Custom field attached to each external route whose use is defined by the application. |
Type 7 NSSA External Link States (“nssa-external” Parameter)
Table 1-14 explains the fields for each database entry.
Table 1-14: NSSA external LSAs
Field | Description |
|---|
Network Mask | IP address mask for the advertised destination |
Metric Type | 1: Type 1 external metric that is comparable directly (without translation) to the link state metric 2: Type 2 external metric that is considered larger than any link state path |
Metric | The cost of this route. |
NSSA: Forward Address | Data traffic for the advertised destination is forwarded to this address. |
External Route Tag | Custom field attached to each external route whose use is defined by the application. |