show isis spf-log

Displays IS-IS link-state packet (LSP) logging information.

Syntax

show isis spf-log

show isis spf-log detail

show isis spf-log level-1 [detail ]

show isis spf-log level-2 [detail ]

Parameters

detail: Specifies detailed information.
level-1: Specifies Level 1 packets only.
level-2: Specifies Level 2 packets only.

Modes

Privileged EXEC mode

Usage Guidelines

IS-IS is supported on the Extreme 8820, SLX 9740, SLX 9640, and SLX 9540 devices only.

Output

The show isis spf-log command displays the following information:


Output field	Description
When	When (in hours: minutes : seconds) a full SPF calculation occurred. The last 20 occurrences are logged.
Duration	The time required to complete this SPF run, Elapsed time is normal clock time (not CPU time). Other options for this field are: Running - the SPF is still running and the duration will be updated after the SFP has run. Pending - the event is pending and another SPF will be run once the currently executing SPF has completed.
Nodes	The number of routers and pseudonodes (LANs) that make up the topology calculated in this SPF run.
Count	The number of events that triggered this SPF run. When a topology change has occurred, multiple link-state packets (LSPs) are received in a short time. Since a router waits about 5 seconds before running a full SPF run, it can include all new information. This count includes the number of events (such as receiving new LSPs) that occurred while the router was waiting the 5 second interval before running full SPF.
Last Trigger LSP	When a full SPF calculation is triggered by the arrival of a new LSP, the router stores the LSP ID. The LSP ID can provide a clue about the source of routing instability in an area. If multiple LSPs in a single level are causing SPF runs, only the LSP ID of the last received LSP is recorded.
Triggers	The reason that a full SPF calculations was triggered.
Alternate Route Check	PSPF deleted an IPv4 or IPv6 route. Full SPF must run to find the alternate route.
Route Change in L1 SPF Run	The L1 SPF run added or deleted an IPv4 or IPv6 route. The L2 SPF must run to accommodate this change.
LSP Purged	An LSP was purged. A full SPF calculation must process this change.
LSP Added	A new LSP has appeared in the database. A full SPF calculation is needed to process this new LSP.
Summary Address Change	A summary address configuration change has occurred.
Adjacency State Change	An adjacency was added or deleted.
Admin Distance Change	The administrative distance configuration has changed.
LSP Header Change	The LSP header (attached or overload bits) is changed.
IS Neighbor TLV Change	An IS neighbor TLV was added or deleted in an LSP.
Area Address TLV Change	The area address TLV changed.
Interface IP Address Change	The IP address configuration changed.
IP Address TLV Change	An IP address TLV changed in the LSP.
IPv6 Address TLV Change	An IPv6 address TLV changed in the LSP.
IS-IS Level Change	The IS-IS level configuration changed.
Interface Metric Change	The IS-IS interface metric configuration changed.
LSP Changed - PSPF Disabled	The LSP changed and PSPF is disabled.
LSP Overload Bit Change	The overload bit in the LSP header changed.
Interface State Change	The interface state changed to up or down.
Redist Prefix-List Change	The redistribution list configuration changed.
Redist Policy Change	The redistribution policy configuration changed.
Maximum Path Change	The IS-IS maximum path configuration changed.
IP Load Sharing Change	The IP load sharing configuration changed.
User Cleared IS-IS Route	The user cleared a specific IS-IS route.
User Cleared IS-IS Routes	The user cleared all IS-IS routes.
Neighbor NLPID Change	NLPID set is changed in received hellos.
ISIS Enable	IS-IS was enabled.
ISTCT_SPF Computation	The user issued the disable-incremental-stct-spf-opt command.
User Cleared IS-IS All	The user issued the clear isis all command.
Interface Config Change	ISIS was enabled or disabled on a port.
User Trigger	The user issued the clear isis spf-trigger command.
Recompute InterLeve Routes	The neighbor IS-type is changed either from L1 to L12 or L12 to L1
Exited Overload State	IS-IS exited from an overload condition.

Examples

The following is sample output for the show isis spf-log command.

device# show isis spf-log
ISIS Level-1 SPF Log
 When      Duration Nodes Count Last-Trigger-LSP         Trigger
  10h34m13s 0ms      1     10    R1.00-00             Interface State Change    
  10h34m38s 0ms      1     2     R1.00-00             Interface Config Change   
  10h34m43s 0ms      1     18    R1.00-00             Interface Config Change   
  10h34m48s 0ms      1     5     R1.00-00             Interface State Change    
ISIS Level-2 SPF Log
 When      Duration Nodes Count Last-Trigger-LSP         Trigger
  10h34m13s 0ms      1     10    R1.00-00             Interface State Change    
  10h34m38s 0ms      1     2     R1.00-00             Interface Config Change   
  10h34m43s 0ms      1     18    R1.00-00             Interface Config Change   
  10h34m48s 0ms      1     5     R1.00-00             Interface State Change

The following is sample output for the show isis spf-log command when the detail keyword is used.

device# show isis spf-log detail

ISIS Level-1 SPF Log
 When      Duration Nodes Count Last-Trigger-LSP         Trigger
  12h18m45s 0ms      1     10    R1.00-00             Interface State Change    
  Ipv4 Route updates: 0 Ipv6 Route updates: 0
        First Trigger: 12h18m50s Ve 305 State Changed to Up
  12h19m10s 0ms      1     2     R1.00-00             Interface Config Change   
  Ipv4 Route updates: 0 Ipv6 Route updates: 0
        First Trigger: 12h19m15s Ve 310 State Changed to Down
  12h19m15s 0ms      1     18    R1.00-00             Interface Config Change   
  Ipv4 Route updates: 0 Ipv6 Route updates: 0
        First Trigger: 12h19m18s Ve 301 State Changed to Down
  12h19m20s 0ms      1     5     R1.00-00             Interface State Change    
  Ipv4 Route updates: 0 Ipv6 Route updates: 0
        First Trigger: 12h19m25s LSP R1.00-00 Area Address TLV Changed
ISIS Level-2 SPF Log
 When      Duration Nodes Count Last-Trigger-LSP         Trigger
  12h18m45s 0ms      1     10    R1.00-00             Interface State Change    
  Ipv4 Route updates: 0 Ipv6 Route updates: 0
        First Trigger: 12h18m50s Ve 305 State Changed to Up
  12h19m10s 0ms      1     2     R1.00-00             Interface Config Change   
  Ipv4 Route updates: 0 Ipv6 Route updates: 0
        First Trigger: 12h19m15s Ve 310 State Changed to Down
  12h19m15s 0ms      1     18    R1.00-00             Interface Config Change   
  Ipv4 Route updates: 0 Ipv6 Route updates: 0
        First Trigger: 12h19m18s Ve 301 State Changed to Down
  12h19m20s 0ms      1     5     R1.00-00             Interface State Change  
…

The following is sample output for the show isis spf-log command when the level-1 keyword is used.

device# show isis spf-log level-1
ISIS Level-1 SPF Log
 When      Duration Nodes Count Last-Trigger-LSP         Trigger
  12h19m40s 0ms      1     10    R1.00-00             Interface State Change    
  12h20m5s 0ms      1     2     R1.00-00             Interface Config Change
  12h20m10s 0ms      1     18    R1.00-00             Interface Config Change   
  12h20m15s 0ms      1     5     R1.00-00             Interface State Change