display isis spf-tree statistics (All views)

Function

The display isis spf-tree statistics command displays the topology of the SPT that is generated by IS-IS.

Format

display isis [ process-id ] spf-tree statistics [ [ level-1 | level-2 ] | ipv6 | [ topology topology-name ] ] ^*

display isis spf-tree statistics process-id [ [ level-1 | level-2 ] | ipv6 | [ topology topology-name ] ] ^*

Parameters

Parameter	Description	Value
process-id	Displays the SPT topology of a specified IS-IS process.	The value is an integer ranging from 1 to 4294967295.
statistics	Displays the statistics of the SPT, including information about links and nodes in the SPT and the status of the SPF calculation.	-
level-1	Displays the SPT topology of Level-1.	-
level-2	Displays the SPT topology of Level-2.	-
ipv6	Displays the SPT topology of IPv6.	-
topology topology-name	Specifies the name of a topology instance.	The value is a string of 1 to 31 case-sensitive characters without spaces. The value must start with a letter (a to z or A to Z, case sensitive) and can contain numbers, hyphens (-), or underlines (_). When double quotation marks are used around the string, spaces are allowed in the string.

Views

All views

Default Level

1: Monitoring level

Task Name and Operations

Task Name	Operations
isis	read

Usage Guidelines

Usage Scenario

When an error occurs in the route calculation, run the display isis spf-tree command to check whether the IS-IS topology information is correct.

You can specify statistics to view the status of the SPT. The generated SPT can be used to calculate routes only when the SPF calculation status is Completed (the ISPF calculation is complete).

Example

The actual command output varies according to the device. The command output here is only an example.

# Display the status statistics of the SPT.

<HUAWEI> display isis spf-tree statistics
                  Statistics information of SPT for ISIS(100)                    
                 --------------------------------------------------------        
                                                                                 
                                                                                 
                                         Level-1 Statistics                      
                                        -----------------------                  
  Nodes information:                                                                 
      Total:                               6                                     
      Count of nodes in SPT:               6                                    
      Count of isolate nodes in SPT:       2                                    
      Count of IPv6 isolate nodes in SPT:  2                                    
      Max Distance of nodes in SPT:        20                                   
      Count of node affected:              0                               

  Links information:                                                                 
      Total:                               12                                   
      Count of links from Parent to Son:   6                                      
      Count of links from Son to Parent:   6                               
  Status of SPF:                           Completed                       
                                                                             
                                         Level-2 Statistics                        
                                      -----------------------                             
  Nodes information:                                                                 
      Total:                               6                                    
      Count of nodes in SPT:               6                                      
      Count of isolate nodes in SPT:       2                                    
      Count of IPv6 isolate nodes in SPT:  2                                    
      Max Distance of nodes in SPT:        20                                   
      Count of node affected:              0                               

  Links information:                                                                 
      Total:                               12                                    
      Count of links from Parent to Son:   6                                    
      Count of links from Son to Parent:   6                               
  Status of SPF:                           Completed

**Table 1** Description of the **display isis spf-tree statistics (All views)** command output
Item	Description
Nodes information	Information about the node.
Count of nodes in SPT	Number of nodes in the SPT tree.
Count of isolate nodes in SPT	Number of isolated nodes in the network topology.
Count of IPv6 isolate nodes in SPT	Number of isolated IPv6 nodes in the network topology.
Count of node affected	Number of affected nodes.
Count of links from Parent to Son	Number of links from the parent node to the child node.
Count of links from Son to Parent	Number of links from the child node to the parent node.
Max Distance of nodes in SPT	Maximum distance from the root node to the leaf node.
Distance	Distance between two nodes. If the value of the Distance field is 0xFE000010, the corresponding node is not on the SPT. In this situation, search the LSDB to check whether the local node has received the LSP with the fragment number of 0 from the faulty node and check whether an IS-IS neighbor relationship is established between the local and faulty nodes.
Links information	Link information.
Status of SPF	Status of the SPF calculation: Completed: The SPF calculation is complete. Scheduled: The SPF calculation is triggered but does not start. Running: The SPF calculation is being performed.
Link	ID of the node that a link passes.
Total	Total number of nodes.