Viewing OSPF link-state information

Syntax:


show ip ospf link-state [status] [subsetoptions] [advertise [subset-options]] [detail]

To display OSPF link state information, enter show ip ospf link-state at any CLI level.

advertise

Displays the hexadecimal data in LSA packets (advertisements) for the OSPF areas configured on the routing switch.

The output can also be filtered by area ( area-id), link-state-id, router-id, sequence-number, and/or type.

Default: All OSPF areas configured on the routing switch.

ospf-area-id

Used to restrict display of LSA database or advertisements to show only the data from a specific OSPF area.

Can also be used with other subset options ( router-id, sequence-number, external link-state-id, and/or type) to further define the source of displayed information.

link-state-id ip-addr

Used to restrict display of LSA database or advertisements to show only the data from sources having the specified IP address as a link-state ID.

Can also be used with other subset options ( ospf-area-id, router-id, sequence-number, external link-state-id, and type) to further define the source of displayed information

router-id ip-addr

Used to restrict display of LSA database or advertisements to show only the data from sources having the specified router ID.

Can also be used with other subset options ( ospf-area-id, link-state-id, sequence-number, and type) to further define the source of displayed information.

sequence-number integer

Used to restrict display of LSA database or advertisements to show only the data from sources having the specified sequence number.

Can also be used with other subset options ( ospf-area-id, link-state-id, router-id, and type) to further define the source of displayed information.

Used to restrict display of LSA database or advertisements to show only the data from sources having the specified type.

Can also be used with other subset options ( ospf-area-id, link-state-id, router-id, and sequence-number) to further define the source of displayed information.

detail

Displays LSA details for the OSPF area(s) configured on the routing switch. The output can also be filtered by area (area-id), link-state-id, router-id, and sequence-number. Default: All OSPF areas configured on the routing switch.

Example

When you enter this command, the switch displays an output similar to the following for all configured areas:

show ip ospf link-state output

OSPF Link State Database for Area 0.0.0.0

                          Advertising
LSA Type   Link State ID   Router ID       Age  Sequence #  Checksum
---------- --------------- --------------- ---- ----------- ---------- 
Router     10.0.8.32       10.0.8.32       65   0x80000281  0x0000a7b6
Router     10.0.8.33       10.0.8.33       1638 0x80000005  0x0000a7c8
Network    10.3.2.37       10.0.8.37       1695 0x80000006  0x00000443
Summary    10.3.16.0       10.0.8.33       1638 0x80000007  0x0000c242
Summary    10.3.16.0       10.0.8.35       1316 0x80000008  0x0000aa58
Summary    10.3.17.0       10.0.8.33       1638 0x8000027b  0x0000becf
Summary    10.3.17.0       10.0.8.35       1316 0x80000008  0x0000a957
AsbSummary 10.0.8.36       10.0.8.33       1412 0x80000002  0x00002cba

OSPF Link State Database for Area 10.3.16.0

                          Advertising
LSA Type   Link State ID   Router ID       Age  Sequence #  Checksum
---------- --------------- --------------- ---- ----------- ---------- 
Router     10.0.8.33       10.0.8.33       1727 0x8000027e  0x0000d53c 
Router     10.0.8.34       10.0.8.34       1420 0x80000283  0x0000de4f 
Network    10.3.16.34      10.0.8.34       1735 0x80000005  0x00001465

The OSPF link-state display shows the following contents of the LSA database; one table for each area:

Table 23: CLI display of OSPF link-state information
Field	Content
LSA Type	The possible types are:
	Router Network Summary AsbSummary
Link State ID	LSA ID for this LSA. The meaning depends on the LSA type.
Advertised Router ID	Router ID of the router that originated this LSA.
Age	Current age (in seconds) of this LSA.
Sequence #	Sequence number of the current instance of this LSA.
Chksum(Hex)	LSA checksum value.

NOTE:

There is a software limitation for sending LSAs from OSPFv3 database to SNMP/CLI. A single query can take 128 links at the maximum. Hence, only up to 128 link entries per router LSA is displayed.

Output for show ip ospf link-state advertise

switch(config)# show ip ospf link-state advertise

OSPF Link State Database for Area 0.0.0.0

  Advertisements
  ------------------------------------------------------------------------
  000202010a0008200a00082080000281a7b60054000000050a030e00ffffff0003000001...
  000202010a0008210a00082180000006a5c90024010000010a0008230a03112104000002
  000102010a0008230a00082380000015755d006c010000070a030600ffffff0003000001...
  000202020a0302250a0008258000000702440024ffffff000a0008250a0008230a000820
  000202030a0310000a00082180000008c043001cffffff0000000002
  000102030a0310000a00082380000009a859001cffffff0000000001
  000002030a0310000a00082480000009ac53001cffffff0000000002
  000202040a0008240a000821800000032abb001c000000000000000b
  000102040a0008240a00082380000004c12a001c0000000000000002

OSPF Link State Database for Area 10.3.16.0

  Advertisements
  ------------------------------------------------------------------------
  000202010a0008210a0008218000027fd33d0054050000050a031900ffffff0003000001...
  000102010a0008220a00082280000284dc500060000000060a031500ffffff0003000001...
  000102020a0311220a0008228000027bf9080020ffffff000a0008220a000821

Output for show IP OSPF link-state detail for router

This is an example of show ip ospf link-state detail output for a router.

switch(config)# show ip ospf link-state detail

OSPF Link State Database for Area 0.0.0.0

  LSA Age                      : 35
  LSA Type                     : 0x1 (Router) 
  Advertising Router           : 2.2.2.3
  Link State ID                : 2.2.2.3
  LSA Sequence                 : 0x80000007
  LSA Checksum                 : 0xfd09
  LSA Option Bits              : E=1 MC=0 N/P=0 EA=0 DC=1
  Router Capability Bits       : B=0 E=1 V=0

  Number of links              : 1
     Interface Type            : 2 (Connected to Transit Network) 
     LSA Metric                : 1
     Link Data                 : 2.2.2.3
     LSA ID                    : 2.2.2.3

     Number of TOS Metrics     : 0

Output for show IP OSPF link-state detail for a network

This is an example of show ip ospf link-state detail summary for LSA detailed output.

switch(config)# show ip ospf link-state detail

OSPF Link State Database for Area 0.0.0.0

  LSA Age                      : 19
  LSA Type                     : 0x2 (Network) 
  Advertising Router           : 16.93.223.84
  Link State ID                : 192.22.23.24
  LSA Sequence                 : 0x80000001
  LSA Checksum                 : 0x323e
  LSA Option Bits              : E=1 MC=0 N/P=0 EA=0 DC=1
  Network Mask                 : 255.255.255.0
     Attached Router ID        : 2.2.2.3
     Attached Router ID        : 192.93.226.105

Output for show IP OSPF link-state detail for summary of LSA detailed output

This is an example of show ip ospf link-state detail summary of LSA for AS Boundary Router.

switch(config)# show ip ospf link-state detail

OSPF Link State Database for Area 0.0.0.0

  LSA Age                  : 58
  LSA Type                 : 0x4 (AS Boundary) 
  Advertising Router       : 16.93.226.105
  Link State ID            : 2.2.2.3
  LSA Sequence             : 0x80000001
  LSA Checksum             : 0x4bc4
  LSA Option Bits          : E=1 MC=0 N/P=0 EA=0 DC=1
  LSA Metric               : 1

Output for show IP OSPF link-state detail for AS external LSA

This example shows show ip ospf link-state detail for an AS external LSA.

switch(config)# show ip ospf link-state detail

  LSA Age                  : 971
  LSA Type                 : 0x5 (AS External) 
  Advertising Router       : 2.2.2.3
  Link State ID            : 55.5.5.0
  LSA Sequence             : 0x80000001
  LSA Checksum             : 0xe17c
  LSA Option Bits          : E=1 MC=0 N/P=0 EA=0 DC=0
  LSA Metric               : 10
  Bit E                    :  0
  Forwarding Address       :  0.0.0.0

Output for show IP OSPF link-state detail for summary for NSSA

This example shows show ip ospf link-state detail summary for NSSA.

switch(config)# show ip ospf link-state detail

  LSA Age                  : 86
  LSA Type                 : 0x7 (NSSA) 
  Advertising Router       : 16.93.226.105
  Link State ID            : 16.93.49.0
  LSA Sequence             : 0x80000003
  LSA Checksum             : 0x6c03
  LSA Option Bits          : E=1 MC=0 N/P=0 EA=0 DC=1
  LSA Metric               : 10
  Network Mask             : 255.255.255.0
  Bit E                    : 0  (External Metric Type1) 
  Forwarding Address       : 0.0.0.0
  External Route Tag       : 0