type mpls lsp trace
To trace LSP paths and localize network faults in an MPLS network, use the
type mpls lsp trace
command
in the appropriate configuration mode. To remove the operation, use the
no
form of this command.
type mpls lsp trace
no type mpls lsp trace
Syntax Description
This command has no keywords or arguments.
Command Default
None
Command Modes
IP SLA operation configuration
IP SLA MPLS LSP monitor definition configuration
Command History
Modification
Release
This command was introduced.
Release 3.4.0
This command was added to IP SLA MPLS LSP monitor
configuration mode.
Release 3.5.0
Usage Guidelines
Use the
type mpls lsp trace
command to configure parameters for an IP SLA LSP trace operation. After you
enter the command, you enter IP SLA MPLS LSP Trace configuration mode.
An MPLS LSP trace operation traces the hop-by-hop route of LSP paths to a target router and measures the
hop-by-hop round-trip delay for IPv4 LDP prefixes and TE tunnel FECs in an MPLS network. Echo request
packets are sent to the control plane of each transit label switching router (LSR). A transit LSR performs
various checks to determine if it is a transit LSR for the LSP path. A trace operation allows you to troubleshoot
network connectivity and localize faults hop-by-hop.
In an MPLS LSP trace operation, each transit LSR returns information related to the type of Forwarding
Equivalence Class (FEC) entity that is being traced. This information allows the trace operation to check if
the local forwarding information matches what the routing protocols determine as the LSP path.
An MPLS label is bound to a packet according to the type of FEC used for the LSP. The following FEC types
are supported for an MPLS LSP trace operation:
•
LDP IPv4 prefixes (configured with the
target ipv4, on page 261
command)
•
MPLS TE tunnels (configured with the
target traffic-eng , on page 265
command)
For MPLS LSP monitor trace operations, only IPv4 LDP prefixes are supported.
If the
type mpls lsp trace
command is used in IP SLA operation configuration mode, it configures the
parameters for the specific operation being configured. If the
type mpls lsp trace
command is used in IP SLA
Cisco IOS XR System Monitoring Command Reference for the Cisco XR 12000 Series Router, Release 4.1
288
OL-24735-01
IP Service Level Agreement Commands
type mpls lsp trace