Monitoring Troubleshooting an OSPF Network

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Table 8-8 describes some fields that are useful in a troubleshooting environment.

Table 8-8 show ip ospf database router output definitions
Field Description

OSPF Router with id Router ID number
Process ID OSPF process ID
LS age Link-state age
Options Type of Service options (Type 0 only)
LS Type Link-state type
Link State ID Link-state ID
Advertising Router Advertising router’s ID
LS Seq Number Link-state sequence (detects old or duplicate link-state advertisements)
Checksum LS checksum (Fletcher checksum of the complete contents of the link-state advertisement)
Length Length in bytes of the link-state advertisement
AS Boundary Router Definition of router type
Number of Links Number of active links
link ID Link type
Link Data Router interface address
TOS Type of Service metric (Type 0 only)

show ip ospf database summary Command

The following is sample output from show ip ospf database summary command when no optional arguments are specified.

    OSPF_Router# show ip ospf database summary          OSPF Router with id(190.20.239.66) (Process ID 300)                   Displaying Summary Net Link States(Area 0.0.0.0)    LS age: 1401    Options: (No TOS-capability)    LS Type: Summary Links(Network)    Link State ID: 155.187.240.0 (summary Network Number)    Advertising Router: 155.187.241.5    LS Seq Number: 80000072    Checksum: 0x84FF    Length: 28    Network Mask: 255.255.255.0 TOS: 0 Metric: 1 

Table 8-9 describes some fields that are useful in a troubleshooting environment.

Table 8-9 show ip ospf database summary output definition
F ield Description

OSPF Router with id Router ID number
Process ID OSPF process ID
LS age Link-state age
Options Type of Service options (Type 0 only)
LS Type Link-state type
Link State ID Link-state ID (summary network number)
Advertising Router Advertising router’s ID
LS Seq Number Link-state sequence (detects old or duplicate link-state advertisements)
Checksum LS checksum (Fletcher checksum of the complete contents of the link-state advertisement)
Length Length in bytes of the link-state advertisement
Network Mask Network mask implemented
TOS Type of Service
Metric Link-state metric

show ip ospf database database-summary Command

Example: The following is sample output from show ip ospf database database-summary command when no optional arguments are specified:

    OSPF_Router# show ip ospf database database-summary             OSPF Router with ID (172.19.65.21) (Process ID 1)    Area ID  Router Network  Sum-Net  Sum-ASBR  Subtotal  Delete  Maxage    202      1     0       0        0        1   0      0    AS External            0       0        0    Total    1     0       0       0        1 

Table 8-10 describes some fields that are useful in a troubleshooting environment.

Table 8-10 show ip ospf database database-summary output definition
Field Description

Area ID Area number
Router Number of router link-state advertisements in that area
Network Number of network link-state advertisements in that area
Sum-Net Number of summary link-state advertisements in that area
Sum-ASBR Number of summary autonomous system boundary router (ASBR) link-state advertisements in that area
Subtotal Sum of Router, Network, Sum-Net, and Sum-ASBR for that area
Delete Number of link-state advertisements that are marked “Deleted” in that area
Maxage Number of link-state advertisements that are marked “Maxaged” in that area
AS External Number of external link-state advertisements

show ip ospf neighbor Command

To display OSPF-neighbor information on a per-interface basis, use the show ip ospf neighbor EXEC command. The syntax for this command is as follows:

    show ip ospf neighbor [type number] [neighbor-id] detail 

Syntax Description:

type. This optional argument represents the Interface type.
number. This optional argument represents the Interface number.
neighbor-id. This optional argument represents the Neighbor ID.
detail. Displays all neighbors given in detail (list all neighbors).


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OSPF Network Design Solutions
OSPF Network Design Solutions
ISBN: 1578700469
EAN: 2147483647
Year: 1998
Pages: 200
Authors: Tom Thomas

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