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# Monitoring OSPF

Two sets of commands enable you to monitor OSPF operation on your router: the debug and the show commands. Both sets of commands provide information about your router’s OSPF state and configuration.

The task you are performing with each of these monitoring commands is basically the same for each command; that is, you are requesting information. The results of this request can vary. For instance, the debug commands provide information (some of which is dynamically obtained from router logs) about problems with the network or the router, whereas the show commands provide information about the actual state and configuration of your router.

## debug Commands

The debug commands provide information about the following OSPF items:

- Adjacencies
- Designated router
- General events
- Link-state advertisements
- Neighbors
- Packets received
- Packets sent
- Route events
- SPF events

debug ip ospf

debug ipv6 ospf

- Use to display information about selected OSPF events. This command has many keywords so you can specify a variety of OSPF events.
- You can set the level of severity for the events you want displayed: 0–7.
- You can set the verbosity of the messages you want displayed: low, medium, high.
- Example 1
  `
  host1#debug ip ospf adj
  `
- Example 2
  `
  host1#debug ipv6 ospf lsa
  `
- Use the no version to cancel the display of any information about the designated variable.
- See debug ip ospf
- See debug ipv6 ospf

ospf log-adjacency-changes

- Use to enable the logging of changes in the state of an OSPF neighbor.
- Example
  `
  host1(config-router)#ospf log-adjacency-changes
  `
- Use the no version to disable the logging of changes in the state of an OSPF neighbor.
- See ospf log-adjacency-changes

undebug ip ospf

undebug ipv6 ospf

- Use to cancel the display of information about a selected event.
- The same OSPF variables can be designated as in the debug ip ospf or debug ipv6 ospf commands.
- Example 1
  `
  host1#undebug ip ospf adj
  `
- Example 2
  `
  host1#undebug ipv6 ospf lsa
  `
- There is no no version.
- See undebug ip ospf
- See undebug ipv6 ospf

## show Commands

The show commands provide information about the following OSPFv2 and OSPFv3 items:

- Routing processes
- Border routers
- Database
- Interfaces
- Neighbors
- Traffic
- Virtual links
- Internal statistics
- MPLS tunnels and opaque LSAs

You can use the output filtering feature of the show command to include or exclude lines of output based on a text string you specify. See JUNOSe System Basics Configuration Guide, for details.

show ip ospf

show ipv6 ospf

- Use to display general information about OSPF routing processes.
- Field descriptions
  - Routing Process—Process ID, router ID, domain ID
  - OSPF administrative state—Enabled or disabled
  - OSPF operational state—Enabled or disabled
  - Incremental External SPF—On or off
  - Graceful Restart Capability—On or off
  - Time limit to complete graceful restart—Amount of time (in seconds) during which the router can reacquire OSPF neighbors that were fully operational prior to the restart
  - Time limit to flush grace LSAs—Amount of time (in seconds) during which the router can remove grace LSAs over all interfaces
  - Graceful Restart Helper Capability—On or off
  - Graceful Restart Help:
    - Not Aborted On Topology Change
    - Aborted On Any Topology Change
    - Aborted On Any Non-External Topology Change
  - OSPF set trap field—Enabled or disabled
  - Router—Router types: internal, area border, or autonomous system boundary routers
  - OSPF Statistics—Packets received and sent; LSA discard count
  - TOS type—Number of types of service supported
  - SPF timers—Timers configured on the router
  - Maximum path splits—Maximum equal-cost paths supported
  - Areas—Areas configured and their parameters
  - Number of areas—Number of areas in the router
- Example 1

      host1#show ip ospf

      Routing Process OSPF 1 with Router ID, 0.0.0.0, Domain ID 0.0.0.0
      OSPF administrative state is enabled
      OSPF operational state is disabled
      Incremental External SPF is ON
      Graceful Restart Capability is ON
      Time limit to complete graceful restart 180 seconds
      Time limit to flush grace LSAs 15 seconds
      Graceful Restart Helper Capability is OFF
      Graceful Restart Help Not Aborted On Topology Change
      Ospf set trap field disabled
      OSPF Statistics:
      Rcvd: 0 total, 0 checksum errors
      0 hello, 0 database desc, 0 link state req
      0 link state updates, 0 link state acks
      Sent: 0 total, 0 pkts dropped
      0 hello, 0 database desc, 0 link state req
      0 link state updates, 0 link state acks
      LSA discard count: 0
      Supports only single TOS(TOS0) routes
      SPF schedule delay 0 secs, Hold time between two SPFs 3 secs
      Maximum path splits 4
      Number of active areas in this router is 0
      0 normal, 0 stub, 0 NSSA.

- Example 2

      host1#show ip ospf

      Routing Process OSPF 4 with Router ID, 10.0.0.1, Domain ID 0.0.0
       OSPF administrative state is enabled
       OSPF operational state is enabled
       Incremental External SPF is ON
       Graceful Restart Capability is OFF
       Graceful Restart Helper Capability is OFF
       Graceful Restart Help Not Aborted On Topology Change
       Ospf set trap field disabled
       OSPF Statistics:
            Rcvd: 0 total, 0 pkts dropped, 0 checksum errors
                  0 hello, 0 database desc, 0 link state req
                  0 link state updates, 0 link state acks
            Sent: 1 total, 0 pkts dropped
                  1 hello, 0 database desc, 0 link state req
                  0 link state updates, 0 link state acks
            LSA discard count: 0
       Supports only single TOS(TOS0) routes
       SPF schedule delay 0 secs, Hold time between two SPFs 3 secs
       Maximum path splits 4
       Area BACKBONE(0.0.0.0)
          SPF algorithm executed 5 times
          ABDR count 0
          ASBDR count 0
          LSA Count 1
          Number of interfaces in this area is 1
          Area ranges are:
       Area 0.0.0.1
          Area is a stub area
          Type-3 summary is filtered
          SPF algorithm executed 5 times
          ABDR count 0
          ASBDR count 0
          LSA Count 0
          Number of interfaces in this area is 0
          Area ranges are:
       Area 0.0.0.2
          Area is nssa
          Type-3 summary is filtered
          SPF algorithm executed 4 times
          ABDR count 0
          ASBDR count 0
          LSA Count 0
          Number of interfaces in this area is 0
          Area ranges are:
       Area 0.0.0.5
          Area is nssa
          SPF algorithm executed 3 times
          ABDR count 0
          ASBDR count 0
          LSA Count 0
          Number of interfaces in this area is 0
          Area ranges are:
       Number of active areas in this router is 4
       1  normal, 1 stub, 2 NSSA.

- Example 3

      host1#show ipv6 ospf
      Routing Process OSPFv3 1 with Router ID 10.1.1.1
       OSPFv3 administrative state is enabled
       OSPFv3 operational state is enabled
       Incremental External SPF is OFF
       Graceful Restart capability is OFF
       Graceful Restart helper capability is OFF
      Ospf set trap field disabled
       SPF schedule delay 0 secs, Hold time between two SPFs 3 secs
       Maximum path splits 4
       Area BACKBONE(0.0.0.0)
      SPF algorithm executed 13 times
      ABDR count 1
      ASBDR count 1
      LSA Count 117
      Number of interfaces in this area is 3
      Area ranges are:
       Number of active areas in this router is 1
      1normal, 0 stub, 0 NSSA.

- See show ip ospf
- See show ipv6 ospf

show ip ospf border-routers

show ipv6 ospf border-routers

- Use to display a list of OSPF border routers.
- Field descriptions
  - Destination—Destination's router ID
  - NEXT HOP—Next hop toward the destination
  - Interface—Interface for which you are obtaining the information
  - Router Type—Router type of the destination: either an ABR or AS boundary router, or both
  - Route Type—Type of this route: either an intra-area or interarea route
  - Area—Area ID of the area from which this route is learned
- Example 1

      host1#show ip ospf border-routers
      Destination NEXT HOP   Interface      Router Type  Route Type Area
      5.5.0.250   5.5.6.250  fastethernet0  ABR/ASBR     INTRA      0.0.0.0
      5.5.0 250   4.4.4.250  fastethernet0  ABR/ASBR     INTRA      0.0.0.1
      6.6.6.250   4.4.4.13   fastethernet0  ABR          INTRA      0.0.0.1

- Example 2

      host1#show ipv6 ospf border-routers
      OSPF Area Border Routers
          Destination       NEXT_HOP       Interface  RouteType       Area
            10.0.0.10       FE80::3       ATM4/1.39   INTRA        0.0.0.0
            10.0.0.11       FE80::4       ATM4/0.41   INTRA        0.0.0.0
            10.0.0.11     FE80::5      ATM4/1.48   INTRA      100.0.0.1

      OSPF Autonomous System Border Routers

          Destination       NEXT_HOP       Interface  RouteType       Area
             10.1.1.4        FE80::3       ATM4/1.39   INTER        0.0.0.0
             10.1.1.5        FE80::4       ATM4/0.41   INTER        0.0.0.0

- See show ip ospf border-routers
- See show ipv6 ospf border-routers

show ip ospf database

show ipv6 ospf database

- Use to display the full IP OSPF database, a summary of the database, or LSAs specific to the given area.
- Field descriptions
  - Link ID—Link-state ID of the LSA; for OSPFv2:
    - For router links, set to the router’s OSPF router ID
    - For network links, set to the IP interface address of the network’s designated router
    - For type 3 summary LSAs, set to an IP network number
    - For type 4 summary LSAs, set to an AS boundary router ID
    - For type 5 externals, set to an IP network number
  - Link ID—Link-state ID of the LSA; for OSPFv3:
    - For link LSAs, set to the interface ID
    - For network links, set to the interface ID
    - For router links, set to integer
    - For intra-area prefix links, set to integer
    - For interarea prefix links, set to integer
    - For interarea router links, set to integer
    - For external links, set to integer
    - For grace links, set to integer
  - ADV Router—ID of the advertising router
  - Age—Link-state age
  - Seq#—Link-state sequence number (detects old or duplicate LSAs)
  - Checksum—Fletcher checksum of the complete contents of the LSA
  - Area—Area for which data is displayed
  - Router—Number of router LSAs
  - Network—Number of network LSAs
  - Intra-Prefix—Number of intra-prefix LSAs
  - Inter-Prefix—Number of inter-prefix LSAs
  - Inter-Router—Number of inter-outer LSAs
  - Link LSAs—Number of link LSAs
  - Grace LSAs—Number of graceful restart LSAs
  - External LSAs—Number of external LSAs
  - MaxAge—Number of LSAs that have reached the maximum age
  - Area—Area for this LSA
  - LS age—LSA age
  - Options—Optional capabilities supported by this router
  - LS Type—LSA type
  - Link State ID—Link-state ID of the link local LSA
  - Length—Length of the LSA (in bytes)
  - Bit set—Bit set used by this LSA type
  - Link connected to—Type of network to which the link connects
  - Neighboring router’s Router ID—Router ID of the neighboring router
  - Neighboring router’s Interface ID—Interface ID of the neighboring router
  - Local Interface ID—Local interface ID
  - Metric—Cost of this interface
  - Attached Router—Addresses of any attached routers
  - Router Priority—Priority value configured for the router
  - Link Local Address—Originating router's link-local interface address on the link
  - Prefixes—Prefixes associated with this LSA
  - Number of Prefixes—Number of prefixes associated with this LSA
  - Referenced LSA Type—Router LSA or network LSA with which the IPv6 address prefixes should be associated
  - Referenced LSA Advertising Router—Router LSA or network LSA with which the IPv6 address prefixes should be associated
  - Referenced LSA ID—Router LSA or network LSA with which the IPv6 address prefixes should be associated
  - asbr—Address of the AS boundary router
  - LS Seq Number—Sequence number of the LSA
  - TLVs—Type of TLV included in LSA
    - 1(Restart duration)—Duration of the restart, in seconds
    - 2(Restart Reason)—Reason that the peer restarted: Unknown, Software Restart, Software Reload, Software Upgrade, Switch to redundant control processor
    - 3(Unknown)—Any recognized type is listed as type 3, unknown; consequently the meaning and units of the value are unknown as well
  - length—Length of the TLV; varies according to the TLV
  - Value—Value of the TLV; varies according to TLV
- Example 1—OSPFv2 output

      host1#show ip ospf database
      OSPF Database

        Router Link States (Area 0.0.0.0)

        Link ID    ADV Router   Age  Seq#        Checksum
      5.1.101.1    5.1.101.1    932  0x80000069  0x102f
      192.168.1.13 192.168.1.13 1763 0x80000099  0xaa4e
      192.168.1.10 192.168.1.10 285  0x80000087  0xada6
      192.168.1.11 192.168.1.11 401  0x80000087  0xaba5
      192.168.24.6 192.168.24.6 622  0x800005bf  0x6087

      Network Link States (Area 0.0.0.0)

        Link ID    ADV Router    Age Seq#       Checksum
      56.56.56.220 5.6.6.1       499 0x80000069 0x26a0
      192.168.1.12 192.168.254.6 622 0x8000009e 0xebc2

        Summary Link States (Area 0.0.0.0)

        Link ID ADV Router   Age Seq#       Checksum
      4.4.4.0   5.5.0.250    497 0x8000005a 0x2ca6
      4.4.4.0   192.168.1.13 528 0x80000059 0x 45d

        AS Summary Link States (Area 0.0.0.0)

        Link ID ADV Router   Age Seq#       Checksum
      5.5.0.250 192.168.1.13 491 0x80000002 0xe9d4

        AS External Link States

      Link ID ADV Router Age Seq#       Checksum
      8.8.8.0 5.5.0.250  502 0x8000005f 0x2d67

        Router Link States (Area 0.0.0.1)

      Link ID      ADV Router   Age Seq#       Checksum
      5.5.0.250    5.5.0.250    498 0x80000067 0xdec1
      192.168.1.13 192.168.1.13 505 0x800000a5 0x3b32

      Network Link States (Area 0.0.0.1)

      Link ID     ADV Router     Age Seq#        Checksum
      4.4.4.13    192.168.1.13   505 0x80000001  0x410b
      5.1.0.0     192.168.1.13   940 0x80000059  0x82c4
      5.2.0.0     5.5.0.250      495 0x80000001  0x51bf
      5.2.0.0     192.168.1.13   932 0x80000059  0x76cf
      5.3.0.0     5.5.0.250      495 0x80000001  0x45ca
      5.3.0.0     192.168.1.13   932 0x80000059  0x6ada
      56.56.56.0  5.5.0.250      495 0x80000062  0xc469

      AS Summary Link States (Area 0.0.0.1)

      Link ID   ADV Router Age Seq#         Checksum
      5.5.0.250 5.5.0.250  496 0x800000001  0x51c0

- Example 2—OSPFv3 general output

      host1#show ipv6 ospf database
      OSPF Database
           V3 Router Link States (Area 0.0.0.0)

      Link ID         ADV Router      Age         Seq#        Checksum
      0.0.0.0         2.2.2.2         167         0x80000003  0xa9e3
      0.0.0.0         3.3.3.3         168         0x80000002  0x2c63

            V3 Inter-Area Net Link States (Area 0.0.0.0)

      Link ID         ADV Router      Age         Seq#        Checksum
      0.0.0.1         2.2.2.2         33          0x80000004  0x5288

            V3 Inter-Area Router Link States (Area 0.0.0.0)

      Link ID         ADV Router      Age         Seq#        Checksum
      0.0.0.1         2.2.2.2         33          0x80000001  0x a0f

            V3 Intra-Area Prefix Link States (Area 0.0.0.0)

      Link ID         ADV Router      Age         Seq#        Checksum
      0.0.0.1         2.2.2.2         167         0x80000003  0xc8ba
      0.0.0.1         3.3.3.3         168         0x80000003  0xdc9e

            V3 Link Link States (Area 0.0.0.0)

      Link ID         ADV Router      Age         Seq#        Checksum
      50.0.0.10       2.2.2.2         178         0x80000001  0xb51d
      50.0.0.13       3.3.3.3         178         0x80000001  0x8c3e

           V3 Router Link States (Area 0.0.0.1)

      Link ID         ADV Router      Age         Seq#        Checksum
      0.0.0.0         1.1.1.1         40          0x80000003  0xf7a4
      0.0.0.0         2.2.2.2         168         0x80000003  0x7825

            V3 Inter-Area Net Link States (Area 0.0.0.1)

      Link ID         ADV Router      Age         Seq#        Checksum
      0.0.0.2         2.2.2.2         33          0x80000004  0x6a4f

            V3 Intra-Area Prefix Link States (Area 0.0.0.1)

      Link ID         ADV Router      Age         Seq#        Checksum
      0.0.0.1         1.1.1.1         169         0x80000003  0x911a
      0.0.0.1         2.2.2.2         168         0x80000003  0xa5fd

            V3 Link Link States (Area 0.0.0.1)

      Link ID         ADV Router      Age         Seq#        Checksum
      50.0.0.6        1.1.1.1         180         0x80000001  0x44b7
      50.0.0.9        2.2.2.2         178         0x80000001  0x1bd8

            V3 External Link States

      Link ID         ADV Router      Age         Seq#        Checksum
      0.0.0.1         1.1.1.1         40          0x80000001  0xe5a0

- Example 3—OSPFv3 database summary information

      host1:v2#show ipv6 ospf database database-summary
       Area     Router   Network   Intra-Prefix   Inter-Prefix   Inter-Router
      -------   ------   -------   ------------   ------------   ------------
      0.0.0.0   2        1         3              0              0
       Area     MaxAge
      -------   ------
      0.0.0.0   0

      Link LSAs: 2, Max age: 0
      Grace LSAs: 1, Max age: 0
      External LSAs: 0, Max age: 0

- Example 4—OSPFv3 LSA output (router)

      host1#show ipv6 ospf database router
      V3 Router Link States (Area 0.0.0.0)
        LS age: 433
        Options: (  V6-Bit , R-Bit , ExternalRoutingCapability,  No Nssa-LSA)
        LS Type: Router Links
        Link State ID: 0.0.0.0
        Advertising Router: 1.1.1.1
        LS Seq Number: 0x80000002
        Checksum: 0x c90
        Length: 40
        Bit E set
           Link connected to: a Point To Point Network
            Neighboring  router's Router Id: 2.2.2.2
            Neighboring  router's Interface Id: 0x3200000a
            Local Interface ID : 0x32000006
            Metric 1

        LS age: 432
        Options: (  V6-Bit , R-Bit , ExternalRoutingCapability,  No Nssa-LSA)
        LS Type: Router Links
        Link State ID: 0.0.0.0
        Advertising Router: 2.2.2.2
        LS Seq Number: 0x80000002
        Checksum: 0x8519
        Length: 40

           Link connected to: a Point To Point Network
            Neighboring  router's Router Id: 1.1.1.1
            Neighboring  router's Interface Id: 0x32000006
            Local Interface ID : 0x3200000a
            Metric 1

- Example 5—OSPFv3 LSA output (network)

      host1#show ipv6 ospf database network
      (Area 0.0.0.1)
      LS Type: Network LSA
      Link State ID: 0.0.0.14
        Advertising Router: 3.3.3.3
            LS age: 131
      LS Seq Number: 0x80000001
        Checksum: 0x6c69
        Length: 32
      Options:   V6-bit set, ExternalRoutingCapability, R-bit set
            Attached Router: 3.3.3.3
            Attached Router: 2.2.2.2

- Example 6—OSPFv3 LSA output (link)

      host1#show ipv6 ospf database link
      V3 Link Link States (Area 0.0.0.0)

      Link ID         ADV Router      Age         Seq#        Checksum

        LS age: 280
        LS Type: Link
        Link State ID: 0x32000006
        Advertising Router: 1.1.1.1
        LS Seq Number: 0x80000001
        Checksum: 0x44b7
        Length: 56
        Router Priority 0
        Link Local Address fe80::90:1a00:200:670
        Prefixes
             1:1:1:1000:: / 60       options 0       metric 0

        LS age: 282
        LS Type: Link
        Link State ID: 0x3200000a
        Advertising Router: 2.2.2.2
        LS Seq Number: 0x80000001
        Checksum: 0x11e1
        Length: 56
        Router Priority 0
        Link Local Address fe80::90:1a00:300:670
        Prefixes
             1:1:1:1000:: / 60       options 0       metric 0

- Example 7—OSPFv3 LSA output (intra-area-prefix)

      host1#show ipv6 ospf database intra-area-prefix

            V3 Intra Area Prefix Link States (Area 0.0.0.0)
        LS age: 162
        LS Type: Intra Area Prefix Links
        Link State ID: 0.0.0.1
        Advertising Router: 1.1.1.1
        LS Seq Number: 0x80000003
        Checksum: 0x911a
        Length: 44
        Number of Prefixes 1
        Referenced LSA Type 0x    2001
        Referenced LSA Advertising Router 1.1.1.1
        Referenced LSA ID 0
        Prefixes
             1:1:1:1000:: / 60       options 0       metric 1

        LS age: 161
        LS Type: Intra Area Prefix Links
        Link State ID: 0.0.0.1
        Advertising Router: 2.2.2.2
        LS Seq Number: 0x80000003
        Checksum: 0xa5fd
        Length: 44
        Number of Prefixes 1
        Referenced LSA Type 0x    2001
        Referenced LSA Advertising Router 2.2.2.2
        Referenced LSA ID 0
        Prefixes
             1:1:1:1000:: / 60       options 0       metric 1

- Example 8—OSPFv3 LSA output (interarea router)

      host1#show ipv6 ospf database inter-area-router

            V3 Inter-Area-Router Link States (Area 0.0.0.0)
        LS age: 304
        LS Type: Inter Area Net Links
        Link State ID: 0.0.0.1
        Advertising Router: 2.2.2.2
        LS Seq Number: 0x80000001
        Checksum: 0x a0f
        Length: 32
           Metric: 1
           Options: 19
           asbr: 1.1.1.1

- Example 9—OSPFv3 LSA output (graceful restart helper)

      host1#show ipv6 ospf database grace
            V3 Grace Link States (Area 0.0.0.1)
      LS age: 3
        LS Type: Grace
        Link State ID: 0x00000002
        Advertising Router: 2.2.2.2
        LS Seq Number: 0x80000001
        Checksum: 0x8409
        Length: 44
       TLVs
      Type: 1(Restart duration), length: 4, Value: 150
      Type: 2(Restart Reason), length: 1, Value: 2(Software Reload)
      Type: 3(Unknown), length: 4, Value: 33686018

- See show ip ospf database
- See show ipv6 ospf database

show ip ospf database link-local

- Use to display OSPF database link local states.
- Field descriptions
  - Interface—Interface for which you are obtaining link-local LSA
  - LS age—Age of LSA
  - LS Type—Type of LSA (Link Local)
  - Link State ID—Link-state ID of the link local LSA
  - Advertising Router—Router ID of the router that originated the LSA
  - LS Seq Number—Link-state sequence number to identify duplicate or old LSIDs
  - Checksum—Checksum of the complete contents of the LSA
  - Length—Length of the LSA in bytes
  - Opaque LSA Type—Type of opaque LSA
  - Neighbor—Neighbor IP address
  - Grace Period—Helper grace period in seconds
  - Restart Reason—Reason for restart; Planned Restart or Unplanned Restart
- Example

      host1#show ip ospf database link-local
      Link-Local States

       Interface : ATM1/3.80
        LS age: 17
        LS Type: Link Local
        Link State ID: 3.0.0.0
        Advertising Router: 100.1.1.67
        LS Seq Number: 0x80000002
        Checksum: 0xac91
        Length: 36
        Opaque LSA Type : Restart Grace
        Neighbor 0.0.0.0
        Grace Period 90 seconds
        Restart Reason : Unplanned Restart

- See show ip ospf database

show ip ospf database opaque-area

- Use to display lists of information about the TE opaque LSAs.
- The TE router address LSA describes a stable IP address on the originating router that can be used for TE purposes—such as setting up TE LSPs to this address.
- The TE link LSA describes TE information about an interface on the originating router.
- Field descriptions
  - LS age—Age of LSA
  - Options—Optional capabilities supported by the described portion of the routing domain
  - LS Type—Type of LSA; opaque area TE router address or opaque area TE link LSA
  - Link State ID—Link-state ID of the opaque LSA
  - Advertising Router—Router ID of the router that originated the LSA
  - LS Seq Number—Link-state sequence number to identify duplicate or old LSIDs
  - Checksum—Checksum of the complete contents of the LSA
  - Length—Length of the LSA in bytes
  - TE Router-ID—Traffic engineering router ID of the originating router
  - Link Type—Point-to-point or multiaccess
  - Link ID—For point-to-point interfaces, this is the router ID of the router at the remote end; for multiaccess interfaces, this is the address of the DR
  - Local Address—IP address of the local interface for the link
  - Remote Address—IP address of the remote (neighbor’s) interface for the link
  - TE Metric—Link metric for traffic engineering purposes; can be different from the standard OSPF link
  - Max BW—Maximum bandwidth that can be used on this link in this direction
  - Max Reservable BW—Maximum bandwidth that can be reserved on this link; can exceed the maximum bandwidth in the event of oversubscription
  - Max Unreserved BW—Amount of bandwidth not yet reserved at each of the eight priority levels; each value is less than or equal to the maximum reservable bandwidth
  - Color—Bitmask that specifies the administrative group membership for this link; a link that is a member of more than one group will have multiple bits set
- Example

      host1#show ip ospf database opaque-area

            Opaque-area Link States (Area 0.0.0.0)

        LS age: 914
        Options:   (TOS-capable, No Type7-LSA, ExternalRoutingCapability, No
        Multicast Capability, No External Attributes    LSA)
        LS Type: Opaque-Area (TE Router Address)
        Link State ID: 1.0.0.0(Instance)
        Advertising Router: 100.1.1.1
        LS Seq Number: 0x80000003
        Checksum: 0xd293
        Length: 28
        TE Router-ID: 100.1.1.1

        LS age: 919
        Options:   (TOS-capable, No Type7-LSA, ExternalRoutingCapability, No
        Multicast Capability, No External Attributes    LSA)
        LS Type: Opaque-Area (TE Links)
        Link State ID: 1.0.0.1(Instance)
        Advertising Router: 100.1.1.1
        LS Seq Number: 0x80000003
        Checksum: 0xf66e
        Length: 124
        Link Type: P2P
        Link ID: 1744896257
       Local Address 14.1.1.2
       Remote Address 14.1.1.1
       TE Metric 0
       Max BW 1000 kb/sec (125000 Bps)
       Max Reservable BW 1000 kb/sec (125000 Bps)
       Max Unreserved BW : pri 0 1000 kb/sec (125000 Bps)
       Max Unreserved BW : pri 1 1000 kb/sec (125000 Bps)
       Max Unreserved BW : pri 2 1000 kb/sec (125000 Bps)
       Max Unreserved BW : pri 3 1000 kb/sec (125000 Bps)
       Max Unreserved BW : pri 4 1000 kb/sec (125000 Bps)
       Max Unreserved BW : pri 5 1000 kb/sec (125000 Bps)
       Max Unreserved BW : pri 6 1000 kb/sec (125000 Bps)
       Max Unreserved BW : pri 7 1000 kb/sec (125000 Bps)
       Color 0

- See show ip ospf database

show ip ospf interface

show ipv6 ospf interface

- Use to display a list of OSPFv2 or OSPFv3 interfaces.
- Use the optional areaId or areaIdInt values to specify an OSPF area ID in either IP or decimal format.
- Field descriptions
  - Interface value (fastEthernet)—Status of the physical link and the operational status of the protocol
  - Internet Address—Interface IP address
  - Area—Area identifier: IP address
  - Network type—Broadcast, NBMA, Point-to-Point, or Point-to-Multipoint
  - Authentication type—None, simple, or MD5
  - Cost—Metric for OSPF transmission
  - Transmit Delay—Time between transmissions from the specified interface
  - Interface State—Current state of the specified interface
  - Priority—Router’s priority on the specified interface
  - Designated Router—Designated router ID and respective interface IP address
  - Backup Designated Router—Designated router ID and respective interface IP address of the backup router
  - Timer intervals—Configuration of timer intervals: Hello, Dead, Wait, and Retransmit
  - Neighbor Count—Number of neighbors and their state; adjacent neighbors
  - LDP is configured through LDP autoconfig—Indicates whether LDP is configured on the interface by means of autoconfiguration; supported only for OSPFv2
  - LDP-IGP Synchronization—Status of synchronization, Achieved or Pending; supported only for OSPFv2
- Example 1

      host1#show ip ospf interface
      FastEthernet0 is up, OSPF line protocol is up
      OSPF interface configuration:
        Internet Address 192.168.1.250, Area 0.0.0.0
        Network type BROADCAST, No authentication
        Cost: 1
        Transmit Delay is 1 sec, Interface State DROTHER, Priority 1
        Designated Router (Interface address) 192.168.1.107
        Backup Designated Router (Interface address) 192.168.1.214
        Timer intervals configured, Hello 10, Dead 40, Wait 120, Retransmit 5
        Neighbor Count is 2, Adjacent neighbor count is 2
        Adjacent with neighbor 192.168.1.107 (Designated Router)
        Adjacent with neighbor 192.168.254.7 (Backup Designated Router)
        LDP is configured through LDP autoconfig
        LDP-IGP Synchronization: Achieved

- Example 2

      host1#show ipv6 ospf interface
      ATM4/0.12 is up, OSPFv3 line protocol is up
       Area 0.0.0.0, Intf ID: 0x320004, Instance ID: 0
       Link Local Address: fe80::90:1a00:100:80
       Interface is active
       Network type POINT-TO-POINT
       Interface State POINT-TO-POINT
       Cost: 1, Priority 1
       No designated router on this network
       No backup designated router on this network
       Timer intervals configured:
       Hello 10, Dead 40, Wait 40
       Transmit Delay is 1 sec(s)
       Retransmit interval is 5 secs
       Neighbor Count is 1
        FULL Adjacent neighbor count is 1
        Adjacent with neighbor 11.0.0.2

      FastEthernet0/0 is up, OSPFv3 line protocol is up
      OSPF interface configuration:
       Interface ID 0.0.1.1
       IPv6 link-local address FE80::3/128
       IPv6 prefix address 3000::1/64, Area 0.0.0.0
       Network type BROADCAST
       Cost: 1
       Transmit Delay is 1 sec, Interface State BACKUPDR, Priority 1
       Designated Router's router ID 1.1.1.1
       Backup Designated Router's router ID 2.2.2.2
       Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
       Neighbor Count is 1, Adjacent neighbor count is 1
        Adjacent with neighbor 3.3.3.3 (Designated Router)

- See show ip ospf interface
- See show ipv6 ospf interface

show ip ospf internal-statistics

show ipv6 ospf internal-statistics

- Use to display internal OSPFv2 or OSPFv3 statistics, such as allocation failures for different OSPF components.
- Use the delta keyword to display statistics relative to the current baseline.
- Field descriptions
  - LSA bytes allocated—Number of bytes allocated for LSAs
  - Router LSA bytes allocated—Number of bytes allocated for router LSAs
  - Summary bytes allocated—Number of bytes allocated for summary LSAs
  - Neighbor RTX bytes allocated—Number of bytes allocated for neighbor retransmissions
  - Timers bytes allocated—Number of bytes allocated for OSPF timers
  - Ospf total bytes free—Total number of bytes free
  - Ospf heap total bytes allocated—Total number of bytes allocated from the OSPF heap
  - Neighbor allocation failures—Number of neighbor allocation failures
  - LSA allocation failures—Number of LSA allocation failures
  - LSA HDR allocation failures—Number of LSA header allocation failures
  - DB Request allocation failures—Number of database request allocation failures
  - RTX allocation failures—Number of neighbor retransmission allocation failures
  - LS Ack allocation failures—Number of LSA acknowledgment packet allocation failures
  - DD pkt allocation failures—Number of database description packet allocation failures
  - OSPF interface allocation failures—Number of interface allocation failures
  - OSPF general packet allocation failures—Number of general packet allocation failures
- Example 1

      host1#show ip ospf internal-statistics
       Routing Process OSPF 1 with Router ID 5.72.3.1
       Internal OSPF Statistics, bytes allocated/free:
            LSA bytes allocated:216
            Router LSA bytes allocated:936
            Summary bytes allocated:0
            Neighbor RTX bytes allocated:0
            Timers bytes allocated:352
            Ospf total bytes free:824368
            Ospf heap total bytes allocated:1048576
       Internal OSPF Statistics, allocation failures:
            Neighbor allocation failures:0
            LSA allocation failures:0
            LSA HDR allocation failures:0
            DB Request allocation failures:0
            RTX allocation failures:0
            LS Ack allocation failures:0
            DD pkt allocation failures:0
            OSPF interface allocation failures:0
            OSPF general packet allocation failures:0

- Example 2

      host1#show ipv6 ospf internal-statistics
      Routing Process OSPFv3 1 with Router ID 1.1.1.1
       Internal OSPF Statistics, bytes allocated/free:
            LSA bytes allocated:                     39
            Router LSA bytes allocated:              1314774
            Summary bytes allocated:                 0
            Timers bytes allocated:                  96
            Ospf total bytes free:                   16
            Ospf heap total bytes allocated:         1000
       Internal OSPF Statistics, allocation failures:
            Neighbor allocation failures:            0
            LSA allocation failures:                 0
            LSA HDR allocation failures:             0
            DB Request allocation failures:          0
            RTX allocation failures:                 0
            LS Ack allocation failures:              0
            DD pkt allocation failures:              0
            OSPF interface allocation failures:      0
            OSPF general packet allocation failures: 0

- See show ip ospf internal-statistics
- See show ipv6 ospf internal-statistics

show ip ospf neighbors

- See show ip ospf neighbors

show ipv6 ospf neighbors

- Use to display information about OSPF neighbors on a per-interface basis.
- Use the optional areaId or areaIdInt values, in the show ipv6 ospf neighbors command, to specify an OSPFv3 area ID in either IP or decimal format.
- You can use the history keyword with the show ip ospf neighbors command to display a history of up to 10 events for all OSPF neighbors or a specific OSPF neighbor. This neighbor uptime tracking feature is not available for OSPFv3. For more information, see Neighbor Uptime Tracking.
- Field descriptions
  - Neighbor ID—Neighbor’s router ID
  - Pri—Router priority of neighbor
  - State—OSPF neighbor’s state
    - DR—Designated router
    - BDR—Backup designated router
    - DR Other—Neighbor to a designated router or a backup designated router
  - Dead Time—Interval since last hello packet from neighbor
  - Address—IP address of the neighbor’s interface
  - Intf ID—Interface ID of the neighbor’s interface
  - Interface—Name of the specified interface and its port number
  - Transition log—List of transitions events for a neighbor
  - Interface—Interface for the neighbor
  - Event—Transition event
  - Cause—Cause of transition event
  - Time—Time stamp for the event in day month date HH : MM : SS format
- Example 1

      host1# show ip ospf neighbors
      Neighbor ID  Pri  State             Dead Time     Address    Interface
      10.0.8.1     1    TWO-WAY/DR Other  00:00:39      10.0.76.1  fastEthernet11/0
      10.0.71.1    1    FULL/DR           00:00:42      10.0.76.2  fastEthernet11/0
      10.0.96.1    1    FULL/BDR          00:00:28      10.0.76.4  fastEthernet11/0

- Example 2

      host1# show ipv6 ospf neighbors
              Neighbor ID  Pri  State            Dead Time Intf ID     Interface
          1.1.1.1      1    TWO-WAY/DROTHER  00:00:40  0x3200042a  FastEthernet13/1.172
          3.3.3.3      1    FULL/BDR         00:00:40  0x32000494  FastEthernet13/1.172
          4.4.4.4      1    FULL/DR          00:00:40  0x320004c9  FastEthernet13/1.172

- Example 3

      host1#show ip ospf neighbors history
      Transition log for neighbor 10.10.8.2:
      Interface           Event Cause           Time
      ==============================================
      ATM2/0.8            Seen  NA              WED DEC 14 07:02:27

      Transition log for neighbor 10.10.12.2:
      Interface           Event Cause           Time
      ==============================================
      ATM2/0.12           Seen  NA              WED DEC 14 07:09:12
      ATM2/0.12           DOWN  Interface down  WED DEC 14 07:05:47
      ATM2/0.12           Seen  NA              WED DEC 14 07:02:32

- See show ipv6 ospf neighbors

show ip ospf remote-neighbor interface

- Use to display all interfaces that are associated with OSPF remote neighbors.
- Field descriptions
  - OSPF remote-neighbor—Remote neighbor address for this interface
  - Update-source—Update source for this interface
  - Remote-neighbor reachable—Reachable status of the remote neighbor, yes or no
  - Area—Area of this interface
  - Network type—Network type for this interface
  - Cost—Cost value for this interface
  - Transmit Delay—Transmit delay for this interface, in seconds
  - Interface State—Interface state
  - Priority—Priority value for this interface
  - Designated router—Designated router on this network, if any
  - Backup designated router—Backup designated router on this network, if any
  - Hello—Hello timer value, in seconds
  - Dead—Dead interval timer value, in seconds
  - Wait—Wait interval timer value, in seconds
  - Retransmit—Retransmit interval timer value, in seconds
  - Neighbor Count—Number of neighbors to this interface
  - Adjacent neighbor count—Number of adjacent neighbors to this interface
  - Adjacent with neighbor—Address of the neighbor adjacent to this interface
- Example

      host1#show ip ospf remote-neighbor interface
      OSPF remote-neighbor 221.221.221.221 interface configuration:
       Update-source loopback0
       Remote-neighbor reachable: yes
       Area 0.0.0.0
       Network type POINT-TO-POINT, No authentication
       Cost: 1
       Transmit Delay is 1 sec, Interface State POINT-TO-POINT, Priority 1
       No designated router on this network
       No backup designated router on this network
       Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
       Neighbor Count is 1, Adjacent neighbor count is 1
        Adjacent with neighbor 221.221.221.221

- See show ip ospf remote-neighbor interface

show ip ospf spf-log

- Use to display how often and why the router has run a full SPF calculation.
- Field descriptions
  - Intra SPF log—Log for SPF calculations run to compute intra-area LSAs
  - Inter SPF log—Log for SPF calculations run to compute interarea LSAs
  - External SPF log—Log for SPF calculations run to compute routes outside the OSPF routing domain
  - When—Amount of time since a full SPF calculation took place, in hours:minutes:seconds; the previous 20 calculations are logged
  - Duration—Number of milliseconds to complete this SPF run; the elapsed time is in actual clock time, not CPU time
  - LSA Router Id—Whenever a full SPF calculation is triggered by a new LSA, the router ID is stored in the router
  - Triggers—List of reasons that triggered a full SPF calculation
- Example

      host1#show ip ospf spf-log

      Intra SPF log
      When     Duration      LSA Router Id    Triggers
      00:04:42 0.000         23.23.23.3       Protocol Off
      00:04:38 0.000         23.23.23.3       LSA Add
      00:04:34 0.000         12.12.12.2       LSA Add
      00:04:30 0.010         23.23.23.3       LSA Update
      00:03:51 0.000         23.23.23.3       Protocol Off
      00:03:47 0.000         23.23.23.3       LSA Add
      00:03:43 0.000         12.12.12.2       LSA Add
      00:03:39 0.000         23.23.23.3       LSA Update

      Inter SPF log
      When     Duration      LSA Router Id    Triggers
      00:04:46 0.010         23.23.23.3       Protocol Off
      00:04:42 0.000         23.23.23.3       LSA Add
      00:04:38 0.000         12.12.12.2       LSA Add
      00:04:34 0.000         23.23.23.3       LSA Update
      00:03:55 0.000         23.23.23.3       Protocol Off
      00:03:51 0.000         23.23.23.3       LSA Add
      00:03:47 0.000         12.12.12.2       LSA Add
      00:03:43 0.000         23.23.23.3       LSA Update

      External SPF log
      When     Duration      LSA Router Id    Triggers
      00:04:47 0.000         23.23.23.3       Protocol Off
      00:04:43 0.000         23.23.23.3       LSA Add
      00:04:39 0.000         12.12.12.2       LSA Add
      00:04:35 0.010         23.23.23.3       LSA Update
      00:03:56 0.000         23.23.23.3       Protocol Off
      00:03:52 0.000         23.23.23.3       LSA Add
      00:03:48 0.000         12.12.12.2       LSA Add
      00:03:44 0.000         23.23.23.3       LSA Update

- See show ip ospf spf-log

show ipv6 ospf summary-prefix

- Use to display summary prefixes configured to summarize externals.
- Example

      host1#show ipv6 ospf summary-prefix
      Summary Prefixes
      4:: / 64
      5:: / 64

- See show ipv6 ospf summary-prefix

show ipv6 ospf traffic

- Use to display OSPFv3 packet statistics.
- Use the delta keyword to display statistics relative to the current baseline.
- Field descriptions
  - Rcvd
    - total—Total number of packets received
    - checksum errors—Total number of packets received that contained checksum errors
    - hello—Total number of hello packets received
    - database desc—Total number of database description packets received
    - link state req—Total number of link-state request packets received
    - link state updates—Total number of link-state update packets received
    - link state acks—Total number of link-state acknowledge packets received
  - Sent
    - total—Total number of sent packets
    - pkts dropped—Total number of packets dropped
    - hello—Total number of hello packets sent
    - database desc—Total number of database description packets sent
    - link state req—Total number of link-state request packets sent
    - link state updates—Total number of link-state update packets sent
    - link state acks—Total number of link-state acknowledge packets sent
  - LSA discard count—Total number of packets discarded
- Example

      host1#show ipv6 ospf traffic
      OSPFv3 Statistics:
            Rcvd: 249 total, 0 checksum errors
                  242 hello, 2 database desc, 1 link state req
                  4 link state updates, 1 link state acks
            Sent: 251 total, 0 pkts dropped
                  242 hello, 3 database desc, 1 link state req
                  4 link state updates, 1 link state acks
            LSA discard count: 0

- See show ipv6 ospf traffic

show ip ospf virtual-links

- Use to display the parameters and the current state of OSPF virtual links.
- Field descriptions
  - Virtual link to router—OSPF neighbor and the current state of the virtual link
  - Transmit Delay—Time (in seconds) between transmissions from the specified interface
  - Timer intervals—Timer intervals (in seconds) configured for the link: Hello, Dead, and Retransmit
- Example

      host1#show ip ospf virtual-links
      Virtual link to router 192.168.1.13 in state POINT-TO-POINT
      Transmit Delay is 1 sec
      Timer intervals configured, Hello 10 sec, Dead 40 sec, Retransmit 5 sec

- See show ip ospf virtual-links

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