Monitor and troubleshoot
Documents under this category 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.
- 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).
- OAM and Diagnostics Guide
- Troubleshooting Toolkit
  This document describes how to use and configure diagnostic tools for the Nokia Service Router Linux (SR Linux).

ldp

ldpIpv4InstanceDown

Table 1. ldpIpv4InstanceDown properties
Property name	Value
Application name	ldp
Event name	ldpIpv4InstanceDown
Default severity	warning
Message format string	In network-instance network_instance, LDP-IPv4 has changed oper-state to DOWN. The reason is oper_down_reason
Cause	This event is generated when LDP ceases to becomes functional for IPv4 adjacencies, FECs and addresses.
Effect	LDP cannot form IPv4 adjacencies and sessions with other such routers.
Raising event	N/A
Clearing event	N/A

ldpIpv4InstanceUp

Table 2. ldpIpv4InstanceUp properties
Property name	Value
Application name	ldp
Event name	ldpIpv4InstanceUp
Default severity	informational
Message format string	In network-instance network_instance, LDP-IPv4 is now up and functional.
Cause	This event is generated when LDP becomes functional for IPv4 adjacencies, FECs and addresses.
Effect	LDP can form IPv4 adjacencies and sessions with other such routers reachable through LDP interfaces that are operational.
Raising event	N/A
Clearing event	N/A

ldpIPv4InterfaceDown

Table 3. ldpIPv4InterfaceDown properties
Property name	Value
Application name	ldp
Event name	ldpIPv4InterfaceDown
Default severity	warning
Message format string	In network-instance network_instance, LDP has changed oper-state to DOWN on the following IPv4 interface subinterface. The reason is oper_down_reason
Cause	This event is generated when LDP ceases to be functional on a subinterface.
Effect	LDP drops its adjacencies and sessions with other routers reachable through this subinterface.
Raising event	N/A
Clearing event	N/A

ldpIPv4InterfaceUp

Table 4. ldpIPv4InterfaceUp properties
Property name	Value
Application name	ldp
Event name	ldpIPv4InterfaceUp
Default severity	informational
Message format string	In network-instance network_instance, LDP is now up and functional on the following IPv4 interface subinterface.
Cause	This event is generated when LDP becomes functional on a subinterface.
Effect	LDP can form adjacencies and sessions with other routers reachable through this subinterface.
Raising event	N/A
Clearing event	N/A

ldpIPv4TargetDown

Table 5. ldpIPv4TargetDown properties
Property name	Value
Application name	ldp
Event name	ldpIPv4TargetDown
Default severity	warning
Message format string	In network-instance network_instance, LDP target peer target has changed oper-state to DOWN. The reason is oper_down_reason
Cause	This event is generated when LDP ceases to be functional on a target.
Effect	LDP drops its adjacencies and sessions with other routers reachable through this target.
Raising event	N/A
Clearing event	N/A

ldpIPv4TargetUp

Table 6. ldpIPv4TargetUp properties
Property name	Value
Application name	ldp
Event name	ldpIPv4TargetUp
Default severity	informational
Message format string	In network-instance network_instance, LDP target peer target state is now in service.
Cause	This event is generated when LDP becomes functional on a target.
Effect	LDP can form adjacencies and sessions with other routers reachable through this target.
Raising event	N/A
Clearing event	N/A

ldpIpv6InstanceDown

Table 7. ldpIpv6InstanceDown properties
Property name	Value
Application name	ldp
Event name	ldpIpv6InstanceDown
Default severity	warning
Message format string	In network-instance network_instance, LDP-IPv6 has changed oper-state to DOWN. The reason is oper_down_reason
Cause	This event is generated when LDP ceases to becomes functional for IPv6 adjacencies, FECs and addresses.
Effect	LDP cannot form IPv6 adjacencies and sessions with other such routers.
Raising event	N/A
Clearing event	N/A

ldpIpv6InstanceUp

Table 8. ldpIpv6InstanceUp properties
Property name	Value
Application name	ldp
Event name	ldpIpv6InstanceUp
Default severity	informational
Message format string	In network-instance network_instance, LDP-IPv6 is now up and functional.
Cause	This event is generated when LDP becomes functional for IPv6 adjacencies, FECs and addresses.
Effect	LDP can form IPv6 adjacencies and sessions with other such routers reachable through LDP interfaces that are operational.
Raising event	N/A
Clearing event	N/A

ldpIPv6InterfaceDown

Table 9. ldpIPv6InterfaceDown properties
Property name	Value
Application name	ldp
Event name	ldpIPv6InterfaceDown
Default severity	warning
Message format string	In network-instance network_instance, LDP has changed oper-state to DOWN on the following IPv6 interface subinterface. The reason is oper_down_reason
Cause	This event is generated when LDP ceases to be functional on a subinterface.
Effect	LDP drops its adjacencies and sessions with other routers reachable through this subinterface.
Raising event	N/A
Clearing event	N/A

ldpIPv6InterfaceUp

Table 10. ldpIPv6InterfaceUp properties
Property name	Value
Application name	ldp
Event name	ldpIPv6InterfaceUp
Default severity	informational
Message format string	In network-instance network_instance, LDP is now up and functional on the following IPv6 interface subinterface.
Cause	This event is generated when LDP becomes functional on a subinterface.
Effect	LDP can form adjacencies and sessions with other routers reachable through this subinterface.
Raising event	N/A
Clearing event	N/A

ldpIPv6TargetDown

Table 11. ldpIPv6TargetDown properties
Property name	Value
Application name	ldp
Event name	ldpIPv6TargetDown
Default severity	warning
Message format string	In network-instance network_instance, LDP target peer target has changed oper-state to DOWN. The reason is oper_down_reason
Cause	This event is generated when LDP ceases to be functional on a target.
Effect	LDP drops its adjacencies and sessions with other routers reachable through this target.
Raising event	N/A
Clearing event	N/A

ldpIPv6TargetUp

Table 12. ldpIPv6TargetUp properties
Property name	Value
Application name	ldp
Event name	ldpIPv6TargetUp
Default severity	informational
Message format string	In network-instance network_instance, LDP target peer target state is now in service.
Cause	This event is generated when LDP becomes functional on a target.
Effect	LDP can form adjacencies and sessions with other routers reachable through this target.
Raising event	N/A
Clearing event	N/A

ldpSessionDown

Table 13. ldpSessionDown properties
Property name	Value
Application name	ldp
Event name	ldpSessionDown
Default severity	warning
Message format string	In network-instance network_instance, the LDP session with peer peer_ldp_id has changed to non-existent.
Cause	This event is generated when an LDP session transitions into the non-existent state from a higher state.
Effect	LDP immediately deletes FEC-label and address bindings received from this peer.
Raising event	N/A
Clearing event	N/A

ldpSessionFecLimitReached

Table 14. ldpSessionFecLimitReached properties
Property name	Value
Application name	ldp
Event name	ldpSessionFecLimitReached
Default severity	warning
Message format string	The number of FECs received from the LDP peer peer_ldp_id has reached the configured limit of fec_limit.
Cause	The number of FECs accepted from the peer has reached the configured limit. If the number of FECs go below the limit and again start to increase and hit the limit a second time, a new event is generated if 2 or more minutes have elapsed since the previous event. If the FEC limit is changed and the current number of FECs is equal to or higher than the limit then the event is generated immediately.
Effect	If the peer supports the overload capability then the session will go into overload. If the peer doesn't support the overload capability then excess FECs will trigger the sending of label release messages back to the peer.
Raising event	N/A
Clearing event	N/A

ldpSessionLocalIPv4Overload

Table 15. ldpSessionLocalIPv4Overload properties
Property name	Value
Application name	ldp
Event name	ldpSessionLocalIPv4Overload
Default severity	warning
Message format string	The LDP session with peer peer_ldp_id has entered overload state for IPv4 FECs because this router sent an overload TLV to the peer.
Cause	The local router has received too many IPv4 FECs.
Effect	The local router is requesting the peer to stop sending further IPv4 FECs.
Raising event	N/A
Clearing event	N/A

ldpSessionLocalIPv4OverloadCleared

Table 16. ldpSessionLocalIPv4OverloadCleared properties
Property name	Value
Application name	ldp
Event name	ldpSessionLocalIPv4OverloadCleared
Default severity	notice
Message format string	The LDP session with peer peer_ldp_id has exited overload state for IPv4 FECs because this router cleared the overload TLV to the peer.
Cause	The local router has cleared overload state.
Effect	The local router cleared the peer to continue sending further IPv4 FECs.
Raising event	N/A
Clearing event	N/A

ldpSessionLocalIPv6Overload

Table 17. ldpSessionLocalIPv6Overload properties
Property name	Value
Application name	ldp
Event name	ldpSessionLocalIPv6Overload
Default severity	warning
Message format string	The LDP session with peer peer_ldp_id has entered overload for IPv6 FECs because this router sent an overload TLV to the peer.
Cause	The local router has received too many IPv6 FECs.
Effect	The local router is requesting the peer to stop sending further IPv6 FECs.
Raising event	N/A
Clearing event	N/A

ldpSessionLocalIPv6OverloadCleared

Table 18. ldpSessionLocalIPv6OverloadCleared properties
Property name	Value
Application name	ldp
Event name	ldpSessionLocalIPv6OverloadCleared
Default severity	notice
Message format string	The LDP session with peer peer_ldp_id has exited overload state for IPv6 FECs because this router cleared the overload TLV to the peer.
Cause	The local router has cleared overload state.
Effect	The local router cleared the peer to continue sending further IPv6 FECs.
Raising event	N/A
Clearing event	N/A

ldpSessionPeerIPv4Overload

Table 19. ldpSessionPeerIPv4Overload properties
Property name	Value
Application name	ldp
Event name	ldpSessionPeerIPv4Overload
Default severity	warning
Message format string	The LDP session with peer peer_ldp_id has entered overload state for IPv4 FECs because the peer sent an overload TLV.
Cause	The peer router has received too many IPv4 FECs.
Effect	The local router stops sending further IPv4 FECs to the peer.
Raising event	N/A
Clearing event	N/A

ldpSessionPeerIPv4OverloadCleared

Table 20. ldpSessionPeerIPv4OverloadCleared properties
Property name	Value
Application name	ldp
Event name	ldpSessionPeerIPv4OverloadCleared
Default severity	notice
Message format string	The LDP session with peer peer_ldp_id has exited overload state for IPv4 FECs because the peer cleared overload TLV.
Cause	The peer router has cleared overload state.
Effect	The local router can again send IPv4 FECs to the peer.
Raising event	N/A
Clearing event	N/A

ldpSessionPeerIPv6Overload

Table 21. ldpSessionPeerIPv6Overload properties
Property name	Value
Application name	ldp
Event name	ldpSessionPeerIPv6Overload
Default severity	warning
Message format string	The LDP session with peer peer_ldp_id has entered overload state for IPv6 FECs because the peer sent an overload TLV.
Cause	The peer router has received too many IPv6 FECs.
Effect	The local router stops sending further IPv6 FECs to the peer.
Raising event	N/A
Clearing event	N/A

ldpSessionPeerIPv6OverloadCleared

Table 22. ldpSessionPeerIPv6OverloadCleared properties
Property name	Value
Application name	ldp
Event name	ldpSessionPeerIPv6OverloadCleared
Default severity	notice
Message format string	The LDP session with peer peer_ldp_id has exited overload state for IPv6 FECs because the peer cleared overload TLV.
Cause	The peer router has cleared overload state.
Effect	The local router can again send IPv6 FECs to the peer.
Raising event	N/A
Clearing event	N/A

ldpSessionUp

Table 23. ldpSessionUp properties
Property name	Value
Application name	ldp
Event name	ldpSessionUp
Default severity	informational
Message format string	In network-instance network_instance, an LDP session is now up and operational with peer peer_ldp_id.
Cause	This event is generated when an LDP session transitions into the operational state from a lower state.
Effect	LDP can exchange FEC-label and address bindings with this peer.
Raising event	N/A
Clearing event	N/A

July 16, 2026