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traceroute mpls segment-routing spring-te

Syntax

Description

Trace route to a remote host for a segment routing label-switched path added by segment routing traffic-engineered (SPRING-TE) tunnel. Use traceroute mpls segment-routing spring-te as a debugging tool to locate MPLS label-switched path forwarding issues in a network.

Options

egress-ip

Specify to trace to or install IP address to use when sending probes.

active

Specify to use the forwarding path or nexthops from the RIB table.
color

Specify the color identifier for the tunnel end-point.

  • Range: 1 through 4294967295
detail

(Optional) Display detailed output.
exp exp

(Optional) Specify the class of service to use when sending probes.

  • Range: 0 through 7
logical-system logical-system-name

(Optional) Specify the name of the logical system for the traceroute attempt.
no-resolve

Specify not to attempt to print addresses symbolically.
retries retries-number

(Optional) Specify the number of times to resend probe values.

  • Range: 1 through 9
routing-instance routing-instance-name

(Optional) Specify the name of the routing instance for the trace route attempt.
secondary

Specify to use configured secondary segment list for the given segment routing path.
segment-list

Specify the segment list to use when sending probes.
skip-fec-validation

Specify to skip forwarding equivalence class (FEC) validation or use NIL FEC.
source source-address

(Optional) Specify the source address of the outgoing traceroute packets.
ttl value

(Optional) Specify the maximum time-to-live value to include in the traceroute request, in seconds.

  • Range: 1 through 255
tunnel-source

Specify the source protocol used to create tunnel.
label-stack

Specify the label stack for traceroute packets. This option works only if you do a minimum configuration of source-packet-routing at the [edit protocols] hierarchy level.

detail

(Optional) Display detailed output.
egress

Specify the egress IP address.
labels

Specify the labels in label stack.

  • Range: 16 through 1048575
logical-system logical-system-name

(Optional) Specify the name of the logical system for the traceroute attempt.
nexthop-address address

Specify the nexthop IP address for the traceroute packet.
nexthop-interface interface

Specify the outgoing interface for the traceroute packet.
no-resolve

Specify not to attempt to print addresses symbolically.
source-routing-path

Specify the trace source path routing to use when sending probes.

lsp-name

Specify the source path routing name.
active

Specify to use the forwarding path or nexthops from the RIB table.
color

Specify the color identifier for the tunnel end-point.

  • Range: 1 through 4294967295
detail

(Optional) Display detailed output.
egress-ip

Specify to trace to or install IP address to use when sending probes.
exp exp

(Optional) Specify the class of service to use when sending probes.

  • Range: 0 through 7
logical-system logical-system-name

(Optional) Specify the name of the logical system for the traceroute attempt.
no-resolve

Specify not to attempt to print addresses symbolically.
retries retries-number

(Optional) Specify the number of times to resend probe values.

  • Range: 1 through 9
secondary

Specify to use configured secondary segment list for the given segment routing path.
segment-list

Specify the segment list to use when sending probes.
skip-fec-validation

Specify to skip forwarding equivalence class (FEC) validation or use NIL FEC.
source source-address

(Optional) Specify the source address of the outgoing traceroute packets.
ttl value

(Optional) Specify the maximum time-to-live value to include in the traceroute request, in seconds.

  • Range: 1 through 255

Additional Information

Note:

With segment-list option, valid tunnel-source (source protocol used to create tunnel) is only static.

Note:

segment-list option is not present when tunnel-source is BGP-SR-TE since BGP-SR-TE does not have named segment list.

Note:

With source-routing-path name, valid tunnel-source are PCEP and static.

Note:

With tunnel-source as PCEP, secondary option is not valid as PCEP always sends one primary LSP.

Note:

FEC validation is performed for traceroute mpls segment-routing spring-te by default.

Note:

FEC validation is supported when segment-routing traffic-engineering (SR-TE) tunnel has IGP labels (OSPF and IS-IS) only. For all the other labels (for example, static, ldp, rsvp, etc.), you can use skip-fec-validation option.

Note:

For a combination of egress-ip and color options, valid tunnel-source are static and BGP-SR-TE.

Note:

traceroute mpls segment-routing spring-te command with label-stack option is supported in operational mode only. It is not supported in configuration mode.

Note:

Parallel SID, binding SID, LDP over SR-TE is not supported.

Note:

In case of traceroute mpls segment-routing spring-te, the PFE supports only 16 ECMP paths. If there more than 16 ECMP paths to the SR-TE LSP, traceroute is done up to a maximum of 16 hops.

Required Privilege Level

network

Output Fields

Table 1 describes the output fields for the traceroute mpls segment-routing spring-te command. Output fields are listed in the approximate order in which they appear.

Table 1: traceroute mpls spring-te Output Fields

Field Name

Field Description

Level of Output

Probe options

Probe options specified in the traceroute mpls segment-routing spring-te command.

all levels

ttl

Time to live value of the labeled packet.

none specified

Label

Outgoing label used for forwarding the packet along the label-switched paths.

none specified

Protocol

Signaling protocol used. For this command, it is LDP.

none specified

Address

Address of the next hop.

none specified

Previous Hop

Address of the previous hop. Previous hop address of the first hop is null.

none specified

Probe status

Forwarding status from the first hop to the last-hop label-switching router (egress point in the label-switched paths).

none specified

Hop

Address of the hops in the label-switched path from the first hop to the last hop. Depth indicates the level of the hop.

detail

Parent

Address of the previous hop. Parent value for the first hop is null.

detail

Return Code

Return code for reporting the result of processing the echo request by the receiver.

detail

Response time

Time for the echo request to reach the receiver.

detail

Multipath type

Labels or addresses used by the specified multipath type. If multipaths are not used, the value is none.

detail

Label Stack

Label stack used to forward the packet.

detail

Sample Output

traceroute mpls segment-routing spring-te

traceroute mpls segment-routing spring-te (source-routing-path) (No FEC validation)

traceroute mpls segment-routing spring-te (source-routing-path) (FEC validation)

traceroute mpls segment-routing spring-te (egress-ip) (No FEC Validation)

traceroute mpls segment-routing spring-te (egress-ip) (FEC Validation)

traceroute mpls segment-routing spring-te (label-stack)

Release Information

Command introduced in Junos OS Release 20.2R1.