Force Explicit-Null - Cisco XR 1200 series Command Reference Manual

force explicit-null

force explicit-null
To add an explicit null label to the label stack of an LSP when an echo request is sent, use the force explicit-null
command in the appropriate configuration mode. To return to the default value, use the no form of this
command.
force explicit-null
no force explicit-null
Syntax Description
This command has no keywords or arguments.
Command Default
An explicit null label is not added.
Command Modes
IP SLA MPLS LSP ping configuration
IP SLA MPLS LSP trace configuration
IP SLA MPLS LSP monitor ping configuration
IP SLA MPLS LSP monitor trace configuration
Command History
Release
Release 3.4.0
Release 3.5.0
Usage Guidelines
Use the force explicit-null command to force an unsolicited explicit null label to be added to the MPLS
label stack of the LSP when an echo request packet is sent in an MPLS LSP ping or MPLS LSP trace operation.
If the force explicit-null command is used in IP SLA operation mode, it acts on the label stack of the LSP
for the specific operation being configured. If the force explicit-null command is used in IP SLA MPLS LSP
monitor mode, it acts on the label stack of all operations associated with the monitored provider edge (PE)
routers. This configuration is inherited by all LSP operations that are created automatically.
You cannot use the force explicit-null command if pseudowire is specified as the target to be used in an
MPLS LSP ping operation.
Task ID
Task ID
monitor
Cisco IOS XR System Monitoring Command Reference for the Cisco XR 12000 Series Router, Release 4.1
142
Modification
This command was introduced.
This command was added to IP SLA MPLS LSP monitor ping and
monitor trace configuration modes.
Operations
read, write
IP Service Level Agreement Commands
OL-24735-01