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
Modification
Release
This command was introduced.
Release 3.4.0
This command was added to IP SLA MPLS LSP monitor ping and
monitor trace configuration modes.
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
Operations
Task ID
read, write
monitor
Cisco IOS XR System Monitoring Command Reference for the Cisco XR 12000 Series Router, Release 4.1
142
OL-24735-01
IP Service Level Agreement Commands
force explicit-null