display isis spf-log

Function

The display isis spf-log command displays IS-IS SPF logs.

Format

display isis spf-log [ process-id | vpn-instance vpn-instance-name ] [ [ level-1 | level-2 ] | ipv6 | verbose ]^*

display isis process-id spf-log [ [ level-1 | level-2 ] | ipv6 | verbose ]^*

Parameters

Parameter	Description	Value
process-id	Specifies an IS-IS process ID.	The value is an integer that ranges from 1 to 65535.
vpn-instance vpn-instance-name	Specifies the IS-IS multi-instance process in a specified VPN instance.	The value must be an existing VPN instance name.
ipv6	Displays SPF logs in IPv6 topologies.	-
level-1	Displays Level-1 SPF logs.	-
level-2	Displays Level-2 SPF logs.	-
verbose	Displays detailed information about SPF logs.	-

Views

All views

Default Level

1: Monitoring level

Usage Guidelines

If the SPT calculated by IS-IS is incorrect, you can run the display isis spf-log command to diagnose the fault. The command displays information about SPF calculation, such as the start time and duration of the SPF calculation, number of nodes, and events that trigger the SPF calculation. You can determine whether the events are the cause of the SPF calculation fault based on the start time of the SPF calculation.

Example

# Display IS-IS SPF logs.

<HUAWEI> display isis spf-log

                                                                                
                        SPF Log information for ISIS(10)                        
                        --------------------------------                        
                                                                                
                            ISIS(10) Level-1 SPF Log                            
                            ------------------------                            
                                                                                
 StartTime  Duration  Nodes  Count  Last Trigger LSP      Trigger Event         
------------------------------------------------------------------------------- 
 2013-09-05 10:14:48+00:00                                                            
            0         1      1      NULL                  ISPF_CIRC_DR_CHANGE   
 2013-09-05 10:13:23+00:00                                                            
            1         1      2      NULL                  FULL_SPF              
                                                                                
                            ISIS(10) Level-2 SPF Log                            
                            ------------------------                            
                                                                                
 StartTime  Duration  Nodes  Count  Last Trigger LSP      Trigger Event         
------------------------------------------------------------------------------- 
 2013-09-05 10:14:48+00:00                                                            
            1         1      1      NULL                  ISPF_CIRC_DR_CHANGE   
 2013-09-05 10:13:23+00:00                                                            
            1         1      2      NULL                  FULL_SPF

**Table 1** Description of the display isis spf-log command output
Item	Description
StartTime	Start time of SPF calculation.
Duration	Duration of SPF calculation.
Nodes	Number of nodes in SPF calculation.
Count	Number of times SPF calculated is triggered.
Last Trigger LSP	LSP that triggers the last SPF calculation: NULL indicates that the LSP is local. LSP ID (specific ID) indicates that the LSP is not local.
Trigger Event	Event that triggers the last SPF calculation: NEWAREA indicates that a new NET is configured. TUNNEL_ADJ indicates that a tunnel neighbor relationship is established. ADJDOWN indicates that a tunnel neighbor goes Down. NEWLSP indicates that the router receives an LSP of a new process. LSPCHANGE indicates that the received LSP is different from local LSPs. RST_T2_CANCEL indicates that the GR T2 Timer is disabled. RST_T3_EXPIRE indicates that the GR T3 Timer expires. RESTART_COMPLETE indicates that the GR is over. CIRC_VLINK_CHANGE indicates that the status of the VLink interface changes. PRC_IPV4_PREFIX_ADD indicates that an IPv4 route is added. PRC_IPV4_PREFIX_DEL indicates that an IPv4 route is deleted. PRC_IPV4_PREFIX_MODIFY indicates that an IPv4 route is modified. PRC_IPV4_PREFIX_MIGP_ADD indicates that an MIGP IPv4 route is added. PRC_IPV4_PREFIX_MIGP_DEL indicates that an MIGP IPv4 route is deleted. PRC_IPV4_PREFIX_MIGP_MODIFY indicates that an MIGP IPv4 route is modified. PRC_IPV6_PREFIX_ADD indicates that an IPv6 route is added. PRC_IPV6_PREFIX_DEL indicates that an IPv6 route is deleted. PRC_IPV6_PREFIX_MODIFY indicates that an IPv6 route is modified. ISPF_ADJ_STATE_CHANGE indicates that the IS-IS neighbor status changes. ISPF_ADJ_USAGE_CHANGE indicates that the IS-IS neighbor level changes. ISPF_ADJ_PROT_USAGE_CHANGE indicates that the protocol used by the IS-IS neighbor changes. ISPF_ADJ_NEXTHOP_CHANGE indicates that the next hop of the IS-IS neighbor changes. ISPF_CIRC_METRIC_CHANGE indicates that the cost on the interface changes. ISPF_CIRC_DR_CHANGE indicates that the DIS changes. ISPF_NODE_DEL indicates that the nodes in the SPT change. ISPF_NODE_OLOAD_CHANGE indicates that the overload bit of the system changes. ISPF_LINK_ADD indicates that a new link is added to the SPT. ISPF_LINK_DEL indicates that a link is deleted from the SPT. ISPF_LINK_METRIC_CHANGE indicates that the cost of a link changes. FULL_SPF indicates that a full SPF calculation is triggered. AREA_CFG_CHANGE indicates that the area of the process changes. AREA_LEARNT_CHANGE indicates that the area of the IS-IS neighbor changes. ISPF_TUNNEL_TYPE_CHANGE indicates that the tunnel type changes. PRC_LEAVE_MAN_OVERLOAD indicates that the system exits the set-overload state that is set manually. PRC_IPV4_SELFLSP_CHANGE indicates that the IPv4 route in the local LSP changes. PRC_IPV6_SELFLSP_CHANGE indicates that the IPv6 route in the local LSP changes. PRC_ALIAS_TLV_CHANGE indicates that the ALIAS TLV in the LSP changes. LFA_LINK_ADD indicates that a link is added to the routes for FRR. LFA_LINK_DEL indicates that a link is deleted from the routes for FRR. LFA_LINK_CHANGE indicates that the links of the routes for FRR change. LFA_NODE_ADD indicates that a node is added along the links of the routes for FRR. LFA_NODE_DEL indicates that a node is deleted from the links of the routes for FRR. LFA_NODE_CHANGE indicates that the nodes along the links of the routes for FRR change. KEY_RESRORE indicates that the local device receives an indirect next hop key.