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Home Documentation Junos OS Junos CLI Reference CLI Reference T

Junos CLI Reference

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traceroute mpls segment-routing isis

date_range 19-Nov-23
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Syntax

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traceroute mpls segment-routing isis fec
algorithm algorithm-id
<destination ip-address>
<detail>
<exp exp>
<fanout fanout-number>
<logical-system logical-system-name>
<no-resolve>
<paths maximum-paths>
<pipe-mode>
<retries retries-number>
<routing-instance routing-instance-name>
<source ip-address>
<ttl value>
<update>
<wait seconds>

Description

Trace route to a remote host for a segment routing label-switched path added by the ISIS protocol. Use traceroute mpls segment-routing isis as a debugging tool to locate MPLS label-switched path forwarding issues in a network.

Options

algorithm algorithm-id (Optional) Specify the flexible algorithm identifier. The range of values is 0 through 255. The default value is 0 which means no algorithm is configured. The algorithm-id in conjunction with the prefix is used to distinguish labelled SR paths.
fec

Specify the IP address and optional prefix of the forwarding equivalence class (FEC).

destination ip-address

(Optional) Specify the destination address to use when sending probes.

  • Values: The destination IP address must be within the 127.0.0.0/8 IP address space for Operation, Administration, and Maintenance (OAM) packets.

detail

(Optional) Display detailed output.

exp exp

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

  • Range: 0 through 7

  • Default: 7

fanout fanout-number

(Optional) Specify the maximum number of nexthops to search per node.

  • Range: 1 through 16

  • Default: 16

logical-system

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

no-resolve

(Optional) Specify not to resolve the hostname that corresponds to the IP address.

paths maximum-paths

(Optional) Specify the maximum number of paths to search.

  • Range: 1 through 255

  • Default: 16

retries retries-number

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

  • Range: 1 through 9

  • Default: 3

routing-instance routing-instance-name

(Optional) Specify the name of the routing instance for the traceroute attempt.

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 125

  • Default: 64

wait seconds

(Optional) Specify the number of seconds to wait before resending a probe.

  • Range: 5 through 15

  • Default: 10

Required Privilege Level

network

Output Fields

Table 1 describes the output fields for the traceroute mpls segment-routing isis fec command and the traceroute mpls segment-routing isis fec detail commands. Output fields are listed in the approximate order in which they appear.

Table 1: traceroute mpls ldp Output Fields

Field Name

Field Description

Level of Output

Probe options

Probe options specified in the traceroute mpls ldp fec 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 isis

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user@router> traceroute mpls segment-routing isis 10.4.4.4

Probe options: ttl 64, retries 3, wait 10, paths 16, exp 7, fanout 16

  ttl    Label  Protocol    Address          Previous Hop     Probe Status
    1   402006  ISIS        12.1.1.2         (null)           Success
  FEC-Stack-Sent: ISIS
  ttl    Label  Protocol    Address          Previous Hop     Probe Status
    2   402006  ISIS        23.1.1.2         12.1.1.2         Success
  FEC-Stack-Sent: ISIS
  ttl    Label  Protocol    Address          Previous Hop     Probe Status
    3   402006  ISIS        34.1.1.2         23.1.1.2         Success
  FEC-Stack-Sent: ISIS
  ttl    Label  Protocol    Address          Previous Hop     Probe Status
    4   402006  ISIS        45.1.1.2         34.1.1.2         Success
  FEC-Stack-Sent: ISIS
  ttl    Label  Protocol    Address          Previous Hop     Probe Status
    5        3  ISIS        56.1.1.2         45.1.1.2         Egress
  FEC-Stack-Sent: ISIS

  Path 1 via ge-0/0/0.0 destination 127.0.0.64

  ttl    Label  Protocol    Address          Previous Hop     Probe Status
    3   402006  ISIS        34.2.1.2         23.1.1.2         Success
  FEC-Stack-Sent: ISIS
  ttl    Label  Protocol    Address          Previous Hop     Probe Status
    4   402006  ISIS        45.1.1.2         34.2.1.2         Success
  FEC-Stack-Sent: ISIS
  ttl    Label  Protocol    Address          Previous Hop     Probe Status
    5        3  ISIS        56.1.1.2         45.1.1.2         Egress
  FEC-Stack-Sent: ISIS

  Path 2 via ge-0/0/0.0 destination 127.0.0.65

  ttl    Label  Protocol    Address          Previous Hop     Probe Status
    3   402006  ISIS        34.5.1.2         23.1.1.2         Success
  FEC-Stack-Sent: ISIS
  ttl    Label  Protocol    Address          Previous Hop     Probe Status
    4   402006  ISIS        45.2.1.2         34.5.1.2         Success
  FEC-Stack-Sent: ISIS
  ttl    Label  Protocol    Address          Previous Hop     Probe Status
    5        3  ISIS        56.1.1.2         45.2.1.2         Egress
  FEC-Stack-Sent: ISIS

  Path 3 via ge-0/0/0.0 destination 127.0.0.69

traceroute mpls segment-routing isis (Labelled IS-IS flexible-algorithm IPv4 traceroute)

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user@router> traceroute mpls segment-routing isis 10.4.4.4 algorithm 130

  Probe options: ttl 64, retries 3, wait 10, paths 16, exp 7, fanout 16

  ttl    Label  Protocol    Address          Previous Hop     Probe Status
    1   401306  ISIS        21.0.3.2         (null)           Success           
  FEC-Stack-Sent: ISIS 
  ttl    Label  Protocol    Address          Previous Hop     Probe Status
    2        3  ISIS        20.34.67.6       21.0.3.2         Egress            
  FEC-Stack-Sent: ISIS 

  Path 1 via ge-0/0/3.0 destination 127.0.0.64

traceroute mpls segment-routing isis (Labelled IS-IS flexible-algorithm IPv6 traceroute)

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user@router> traceroute mpls segment-routing isis 10:4:4::4 algorithm 130  

Probe options: retries 3, exp 7

  ttl    Label  Protocol    Address          Previous Hop     Probe Status
    1   402406  ISIS        d:0:3::3         (null)           Success           
  FEC-Stack-Sent: ISIS IPv6 
  ttl    Label  Protocol    Address          Previous Hop     Probe Status
    2        3  ISIS        d:34:67::6       d:0:3::3         Egress            
  FEC-Stack-Sent: ISIS IPv6 

  Path 1 via ge-0/0/3.0 destination ::ffff:127.0.0.64

  ttl    Label  Protocol    Address          Previous Hop     Probe Status
    1   402406  ISIS        d:0:4::4         (null)           Success           
  FEC-Stack-Sent: ISIS IPv6 
  ttl    Label  Protocol    Address          Previous Hop     Probe Status
    2        3  ISIS        d:4:6::6         d:0:4::4         Egress            
  FEC-Stack-Sent: ISIS IPv6 

  Path 2 via ge-0/0/6.0 destination ::ffff:127.0.1.64

traceroute mpls segment-routing isis (Labelled IS-IS flexible-algorithm IPv4 traceroute, Ingress ECMP)

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user@host> traceroute mpls segment-routing isis 10.4.4.4 algorithm 130     
  Probe options: ttl 64, retries 3, wait 10, paths 16, exp 7, fanout 16

  ttl    Label  Protocol    Address          Previous Hop     Probe Status
    1   401406  ISIS        21.0.3.2         (null)           Success           
  FEC-Stack-Sent: ISIS 
  ttl    Label  Protocol    Address          Previous Hop     Probe Status
    2        3  ISIS        20.34.67.6       21.0.3.2         Egress            
  FEC-Stack-Sent: ISIS 

  Path 1 via ge-0/0/3.0 destination 127.0.0.64

  ttl    Label  Protocol    Address          Previous Hop     Probe Status
    1   401406  ISIS        21.0.4.2         (null)           Success           
  FEC-Stack-Sent: ISIS 
  ttl    Label  Protocol    Address          Previous Hop     Probe Status
    2        3  ISIS        21.4.6.2         21.0.4.2         Egress            
  FEC-Stack-Sent: ISIS 

  Path 2 via ge-0/0/6.0 destination 127.0.1.64

Release Information

Command introduced in Junos OS Release 19.1R1.

algorithm option introduced in Junos OS Release 23.1R1 and Junos OS Evolved Release 23.1R1.

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