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Monitor and troubleshoot
Documents in this section describe tools that can help you monitor, diagnose, and troubleshoot SR Linux software. This section also includes Log Event documentation to help you interpret log messages generated by SR Linux software.
Log Events Guide
This document provides guidance for operators to interpret log events for the Nokia Service Router Linux (SR Linux).
isis

Monitor and troubleshoot
Documents in this section describe tools that can help you monitor, diagnose, and troubleshoot SR Linux software. This section also includes Log Event documentation to help you interpret log messages generated by SR Linux software.
- Troubleshooting Toolkit
  This document describes how to use and configure diagnostic tools for the Nokia Service Router Linux (SR Linux).
- Event Handler Guide
  This document describes the functionality and configuration for the event handler framework on the Nokia Service Router Linux (SR Linux).
- Log Events Guide
  This document provides guidance for operators to interpret log events for the Nokia Service Router Linux (SR Linux).

isis

isisAdjacencyBfdSessionSetupFailed

Table 1. isisAdjacencyBfdSessionSetupFailed properties
Property name	Value
Application name	isis
Event name	isisAdjacencyBfdSessionSetupFailed
Default severity	warning
Message format string	In network-instance network_instance, BFD session setup failed for the level IS-IS adjacency with system sys_id, using interface subinterface. Failure reason: bfd_failure_reason.
Cause	This event is generated when BFD session setup fails with an adjacent neighbor.
Effect	Fast failure detection may not be possible.

isisAdjacencyChange

Table 2. isisAdjacencyChange properties
Property name	Value
Application name	isis
Event name	isisAdjacencyChange
Default severity	warning
Message format string	In network-instance network_instance, the level IS-IS adjacency with system sys_id, using interface subinterface, moved to state adj_state.
Cause	This event is generated when an IS-IS adjacency enters or leaves the up state.
Effect	IS-IS traffic can only be forwarded along adjacencies that are up.

isisAdjacencyRestartStatusChange

Table 3. isisAdjacencyRestartStatusChange properties
Property name	Value
Application name	isis
Event name	isisAdjacencyRestartStatusChange
Default severity	warning
Message format string	In network-instance network_instance, the graceful restart status for the level IS-IS adjacency on interface subinterface moved to new state restart_status.
Cause	This event is generated when the graceful restart status of a neighbor changes.
Effect	None

isisAreaMismatch

Table 4. isisAreaMismatch properties
Property name	Value
Application name	isis
Event name	isisAreaMismatch
Default severity	warning
Message format string	In network-instance network_instance, a level1 PDU was received on interface subinterface with no Area Addresses matching the areas to which this IS router belongs. The PDU starts with: pdu_fragment
Cause	This event is generated to alert of a possible area-id misconfiguration inside a L1 area.
Effect	L1 adjacency cannot form

isisAuthDataFail

Table 5. isisAuthDataFail properties
Property name	Value
Application name	isis
Event name	isisAuthDataFail
Default severity	warning
Message format string	In network-instance network_instance, a level PDU was received on interface subinterface with unexpected or incorrect data in the Authentication TLV. The PDU starts with: pdu_fragment
Cause	This event could be caused by incorrect keychain configuration in this router or its neighbor.
Effect	PDUs are dropped, with the effect depending on the PDU type

isisAuthTypeMismatch

Table 6. isisAuthTypeMismatch properties
Property name	Value
Application name	isis
Event name	isisAuthTypeMismatch
Default severity	warning
Message format string	In network-instance network_instance, a level PDU was received on interface subinterface with an unrecognized or unsupported authentication type in TLV 10. The PDU starts with: pdu_fragment
Cause	This event could be caused by incorrect keychain configuration in this router or its neighbor.
Effect	PDUs are dropped, with the effect depending on the PDU type

isisCircuitIdsExhausted

Table 7. isisCircuitIdsExhausted properties
Property name	Value
Application name	isis
Event name	isisCircuitIdsExhausted
Default severity	warning
Message format string	In network-instance network_instance, the IS-IS interface subinterface is operationally down because the limit of 255 circuit IDs available to LAN interfaces was reached.
Cause	This event is caused by having too many LAN interfaces.
Effect	LAN adjacencies are not formed

isisCircuitMtuTooLow

Table 8. isisCircuitMtuTooLow properties
Property name	Value
Application name	isis
Event name	isisCircuitMtuTooLow
Default severity	warning
Message format string	In network-instance network_instance, a level LSP PDU or SNP PDU could not be transmitted on interface subinterface because the IP MTU is only operational_subif_mtu and an MTU of at least required_mtu is required.
Cause	The port MTU is too small and/or the lsp-mtu-size is too large.
Effect	PDUs are dropped

isisCorruptedLspDetected

Table 9. isisCorruptedLspDetected properties
Property name	Value
Application name	isis
Event name	isisCorruptedLspDetected
Default severity	warning
Message format string	In network-instance network_instance, the LSP PDU with ID lsp_id in the level database has become corrupted.
Cause	Memory corruption or other.
Effect	LSP is removed

isisLdpSyncExited

Table 10. isisLdpSyncExited properties
Property name	Value
Application name	isis
Event name	isisLdpSyncExited
Default severity	warning
Message format string	In network-instance network_instance, the LDP synchronization state has ended on IS-IS interface subinterface, and now the state is sync_state
Cause	The LDP synchronization timer can be stopped because of a tools command, hold-down timer expiry or indication from the LDP peer that End-of-LIB has been received. When LDP sync is exited IS-IS resumes advertising a normal metric for the interface.
Effect	Transit traffic can start using this interface again.

isisLdpSyncTimerStarted

Table 11. isisLdpSyncTimerStarted properties
Property name	Value
Application name	isis
Event name	isisLdpSyncTimerStarted
Default severity	warning
Message format string	In network-instance network_instance, the LDP synchronization timer has started on IS-IS interface subinterface
Cause	The sync timer is started when LDP synchronization is configured and the LDP adjacency comes up with the LDP peer. When this timer expires IS-IS will resume advertisement of a normal metric for the interface.
Effect	Transit traffic will continue to avoid using this interface.

isisLspFragmentTooLarge

Table 12. isisLspFragmentTooLarge properties
Property name	Value
Application name	isis
Event name	isisLspFragmentTooLarge
Default severity	warning
Message format string	In network-instance network_instance, the level LSP PDU fragment lsp_id received on interface subinterface could not be accepted because the configured LSP MTU size is too small. An LSP MTU size of at least required_lsp_mtu bytes is required.
Cause	Misconfiguration of LSP MTU size
Effect	LSP PDU is not accepted

isisLspPurge

Table 13. isisLspPurge properties
Property name	Value
Application name	isis
Event name	isisLspPurge
Default severity	warning
Message format string	In network-instance network_instance, the LSP PDU with ID lsp_id in the level database has been purged by purge_originator.
Cause	LSP lifetime expired or other reason
Effect	The PDU is removed

isisLspSequenceNumberSkip

Table 14. isisLspSequenceNumberSkip properties
Property name	Value
Application name	isis
Event name	isisLspSequenceNumberSkip
Default severity	warning
Message format string	In network-instance network_instance, the LSP with id lsp_id in the level database was re-originated with a sequence number that incremented by more than one.
Cause	There may be another IS router configured with the same system ID.
Effect	None

isisMaxAreaAddressesMismatch

Table 15. isisMaxAreaAddressesMismatch properties
Property name	Value
Application name	isis
Event name	isisMaxAreaAddressesMismatch
Default severity	warning
Message format string	In network-instance network_instance, a level PDU was received on interface subinterface with an unexpected Max Area Addresses value in the IS-IS PDU header. The PDU starts with: pdu_fragment
Cause	Misconfiguration of max area addresses in the neighbor
Effect	The PDU is dropped

isisMaxLspSequenceNumberExceeded

Table 16. isisMaxLspSequenceNumberExceeded properties
Property name	Value
Application name	isis
Event name	isisMaxLspSequenceNumberExceeded
Default severity	warning
Message format string	In network-instance network_instance, the LSP with id lsp_id in the level database was purged because the sequence number was already at its maximum value and could not be incremented.
Cause	A possible cause could be that the same system-id is configured on multiple systems; when 2 systems have the same system-id they both keep incrementing the LSP sequence number, causing the sequence counter to rollover.
Effect	The PDU is purged and reachability may be temporarily lost

isisOverloadEntry

Table 17. isisOverloadEntry properties
Property name	Value
Application name	isis
Event name	isisOverloadEntry
Default severity	warning
Message format string	In the IS-IS instance of network-instance network_instance, the level database has entered the overload state.
Cause	Overload bit configuration
Effect	No transit traffic is routed through the overloaded router.

isisOverloadExit

Table 18. isisOverloadExit properties
Property name	Value
Application name	isis
Event name	isisOverloadExit
Default severity	warning
Message format string	In the IS-IS instance of network-instance network_instance, the level database has exited from the overload state.
Cause	Overload bit configuration
Effect	Transit traffic can again be routed through the router.

isisOwnLspPurge

Table 19. isisOwnLspPurge properties
Property name	Value
Application name	isis
Event name	isisOwnLspPurge
Default severity	warning
Message format string	In network-instance network_instance, a level LSP PDU was received with the system ID of this IS router and age equal to zero. The purge originator was purge_originator.
Cause	LSP lifetime expired or other reason
Effect	The PDU is removed

isisSystemIdLengthMismatch

Table 20. isisSystemIdLengthMismatch properties
Property name	Value
Application name	isis
Event name	isisSystemIdLengthMismatch
Default severity	warning
Message format string	In network-instance network_instance, a level PDU was received on interface subinterface with an unexpected System ID length in the IS-IS PDU header. The PDU starts with: pdu_fragment
Cause	Misconfiguration of system ID length in the neighbor
Effect	The PDU is dropped

isisVersionMismatch

Table 21. isisVersionMismatch properties
Property name	Value
Application name	isis
Event name	isisVersionMismatch
Default severity	warning
Message format string	In network-instance network_instance, a level PDU was received on interface subinterface with an IS-IS protocol version not matching the expected value. The PDU starts with: pdu_fragment
Cause	Unsupported IS-IS version
Effect	PDUs cannot be exchanged