MPLS OAM Commands

This module describes Multiprotocol Label Switching (MPLS) label switched path (LSP) verification commands. These commands provide a means to detect and diagnose data plane failures and are the first set of commands in the MPLS Operations, Administration, and Maintenance (OAM) solution.

For detailed information about MPLS concepts, configuration tasks, and examples, see .

clear mpls oam counters

To clear MPLS OAM counters, use the clear mpls oam counters command in XR EXEC mode.

clear mpls oam counters {global | interface [type interface-path-id] | packet}

Syntax Description

global

Clears global counters.

interface

Clears counters on a specified interface.

type

Interface type. For more information, use the question mark (? ) online help function.

interface-path-id

Physical interface or virtual interface.

Note

 

Use the show interfaces command to see a list of all interfaces currently configured on the router.

For more information about the syntax for the router, use the question mark (? ) online help function.

packet

Clears global packet counters.

Command Default

No default behavior or values

Command Modes

XR EXEC mode

Command History

Release

Modification

Release 6.0

This command was introduced.

Usage Guidelines

No specific guidelines impact the use of this command.

Task ID

Task ID

Operations

mpls-ldp

execute

mpls-static

execute

Examples

The following example shows how to clear all global MPLS OAM counters: 


RP/0/RP0/CPU0:router# clear mpls oam counters global

echo disable-vendor-extension

To disable sending the vendor extension type length and value (TLV) in the echo request, use the echo disable-vendor extension command in MPLS OAM configuration mode. To return to the default behavior, use the no form of this command.

echo disable-vendor-extension

no echo disable-vendor-extension

Syntax Description

This command has no arguments or keywords.

Command Default

The default value is 4.

Command Modes

MPLS OAM configuration mode

Command History

Release

Modification

Release 6.0

This command was introduced.

Usage Guidelines

No specific guidelines impact the use of this command.

Task ID

Task ID

Operations

mpls-ldp

read, write

mpls-static

read, write

Examples

The following example shows how to disable inclusion of the vendor extensions TLV in the echo requests: 


RP/0/RP0/CPU0:router# configure
RP/0/RP0/CPU0:router(config)# mpls oam
RP/0/RP0/CPU0:router(config-oam)# echo disable-vendor-extension

mpls oam

To enable MPLS OAM LSP verification, use the mpls oam command in XR Config mode. To return to the default behavior, use the no form of this command.

mpls oam

no mpls oam

Syntax Description

This command has no arguments or keywords.

Command Default

By default, MPLS OAM functionality is disabled.

Command Modes

XR Config mode

Command History

Release

Modification

Release 6.0

This command was introduced.

Usage Guidelines

The mpls oam command and OAM functionality is described in the RFC 4379.

Task ID

Task ID

Operations

mpls-ldp

read, write

mpls-static

read, write

Examples

The following example shows how to enable MPLS OAM: 


RP/0/RP0/CPU0:router# configure
RP/0/RP0/CPU0:router(config)# mpls oam
RP/0/RP0/CPU0:router(config-oam)#

ping mpls ipv4

To check MPLS host reachability and network connectivity by specifying the destination type as a Label Distribution Protocol (LDP) IPv4 address, use the ping mpls ipv4 command in XR EXEC mode.

ping mpls ipv4 address/mask [destination start-address end-address increment] [dsmap] [exp exp-bits] [force-explicit-null] [interval min-send-delay] [output interface type interface-path-id [nexthop nexthop-address]] [pad pattern] [repeat count] [reply {dscp dscp-value | reply mode {ipv4 | no-reply | router-alert} | reply pad-tlv}] [size packet-size] [source source-address] [sweep min value max value increment] [timeout timeout] [ttl value] [verbose] [fec-type {bgp | generic | ldp}]

Syntax Description

address/mask

Address prefix of the target and number of bits in the target address network mask.

destination start address end address address increment

(Optional) Specifies a network 127/8 address to be used as the destination address in the echo request packet.
start address

Start of the network address.

end address

Start of the ending network address.

address increment

Incremental value of the network address, which is expressed as a decimal number value or IP address.

dsmap

(Optional) Indicates that a downstream mapping (DSMAP) type length and value should be included in the LSP echo request.

exp exp-bits

(Optional) Specifies the MPLS experimental field value in the MPLS header for echo replies. Range is 0 to 7. Default is 0.

force-explicit-null

(Optional) Forces an unsolicited explicit null label to be added to the MPLS label stack and allows LSP ping to be used to detect LSP breakages at the penultimate hop.

interval min-send-delay

(Optional) Specifies a send interval, in milliseconds, between requests. Range is 0 to 3600000. Default is 0.

output interface

(Optional) Specifies the output interface where echo request packets are sent.

type

Interface type. For more information, use the question mark (?) online help function.

interface-path-id

Physical interface or virtual interface.

Note

 

Use the show interfaces command to see a list of all interfaces currently configured on the router.

For more information, use the question mark (?) online help function.

nexthop

(Optional) Specifies the nextop as an IP address.

nexthop-iaddress

(Optional) IP address for the next hop.

pad pattern

(Optional) Specifies the pad pattern for an echo request.

repeat count

(Optional) Specifies the number of times to resend a packet. Range is 1 to 2147483647. Default is 5.

reply dscp dscp-value

Specifies the differentiated service codepoint value for an MPLS echo reply.

reply mode [ ipv4 | router-alert | no-reply ]

Specifies the reply mode for the echo request packet.
no-reply

Do not reply

ipv4

Reply with an IPv4 UDP packet (this is the default)

router-alert

Reply with an IPv4 UDP packet with the IP router alert set

reply pad-tlv

Indicates that a pad TLV should be included.

size packet size

(Optional) Specifies the packet size or number of bytes in each MPLS echo request packet. Range is 100 to 17986. Default is 100.

source source-address

(Optional) Specifies the source address used in the echo request packet.

sweep min value max value interval

(Optional) Specifies a range of sizes for the echo packets sent.
min value

Minimum or start size for an echo packet (range is 100 to 17986)

max value

Maximum or end size for an echo packet(range is 100 to 17986)

interval

Number used to increment an echo packet size(range is 1 to 8993)

timeout timeout

(Optional) Specifies the timeout interval, in seconds. Range is 0 to 3600. Default is 2.

ttl value

(Optional) Specifies the TTL value to be used in the MPLS labels (range is 1 to 255).

verbose

(Optional) Enables verbose output information, including MPLS echo reply, sender address of the packet, and return codes.

fec-type

(Optional) Specifies FEC type to be used.

generic

Use FEC type as generic

ldp

Use FEC type as LDP

Command Default

exp exp bits : 0

interval min-send-delay: 0

repeat count : 5

reply-mode : IPv4

timeout timeout : 2

Command Modes

XR EXEC mode

Command History

Release

Modification

Release 6.0

This command was introduced.

Usage Guidelines

The output interface keyword specifies the output interface on which the MPLS echo request packets are sent. If the specified output interface is not part of the LSP, the packets are not transmitted.

In cases where the sweep keyword is used, values larger than the outgoing interface’s MTU are not transmitted.

The ping command sends an echo request packet to an address, and then awaits a reply. Ping output can help you evaluate path-to-host reliability, delays over the path, and whether the host can be reached or is functioning.


Note

The ping mpls command is not supported on optical LSPs. If an optical LSP is encountered along the LSP's path, it is treated as a physical interface.

Task ID

Task ID

Operations

mpls-ldp

read, write

Examples

The following example shows the destination type as a label distribution protocol (LDP) prefix and specifies a range of sizes for the echo packets sent: 


RP/0/RP0/CPU0:router# ping mpls ipv4 7.7.7.7/32 verbose sweep 100 200 15 repeat 1
  
  Sending 1, [100..200]-byte MPLS Echos to 7.7.7.7/32,
      timeout is 2 seconds, send interval is 0 msec:

Codes: '!' - success, 'Q' - request not sent, '.' - timeout,
  'L' - labeled output interface, 'B' - unlabeled output interface,
  'D' - DS Map mismatch, 'F' - no FEC mapping, 'f' - FEC mismatch,
  'M' - malformed request, 'm' - unsupported tlvs, 'N' - no rx label,
  'P' - no rx intf label prot, 'p' - premature termination of LSP,
  'R' - transit router, 'I' - unknown upstream index,
  'X' - unknown return code, 'x' - return code 0

Type escape sequence to abort.

!      size 100, reply addr 178.0.0.1, return code 3
!      size 115, reply addr 178.0.0.1, return code 3
!      size 130, reply addr 178.0.0.1, return code 3
!      size 145, reply addr 178.0.0.1, return code 3
!      size 160, reply addr 178.0.0.1, return code 3
!      size 175, reply addr 178.0.0.1, return code 3
!      size 190, reply addr 178.0.0.1, return code 3

Success rate is 100 percent (7/7), round-trip min/avg/max = 2/2/4 ms

The following example shows the destination type as a label distribution protocol (LDP) prefix and specifies FEC type as generic and verbose option: 


RP/0/RP0/CPU0:router# ping mpls ipv4 7.7.7.7/32 fec-type generic output interface TenGigE 0/0/0/11 nexthop 79.1.0.2 verbose

Sending 5, 100-byte MPLS Echos to 7.7.7.7/32,
      timeout is 2 seconds, send interval is 0 msec:

Codes: '!' - success, 'Q' - request not sent, '.' - timeout,
  'L' - labeled output interface, 'B' - unlabeled output interface,
  'D' - DS Map mismatch, 'F' - no FEC mapping, 'f' - FEC mismatch,
  'M' - malformed request, 'm' - unsupported tlvs, 'N' - no rx label,
  'P' - no rx intf label prot, 'p' - premature termination of LSP,
  'R' - transit router, 'I' - unknown upstream index,
  'X' - unknown return code, 'x' - return code 0

Type escape sequence to abort.

!      size 100, reply addr 178.0.0.1, return code 3
!      size 100, reply addr 178.0.0.1, return code 3
!      size 100, reply addr 178.0.0.1, return code 3
!      size 100, reply addr 178.0.0.1, return code 3
!      size 100, reply addr 178.0.0.1, return code 3

Success rate is 100 percent (5/5), round-trip min/avg/max = 2/2/3 ms

show mpls oam

To display MPLS OAM information, use the show mpls oam command in XR EXEC mode.

show mpls oam {client | counters {global | packet} | interface type interface-path-id}

Syntax Description

client

Displays clients registered with LSPV server.

counters global

Displays LSP verification global counters.

counters packet

Displays LSP verification packet counters.

interface

Displays LSP verification information for a specific interface.

type

Interface type. For more information, use the question mark (? ) online help function.

interface-path-id

Physical interface or virtual interface.

Note

 

Use the show interfaces command to see a list of all interfaces currently configured on the router.

For more information about the syntax for the router, use the question mark (? ) online help function.

Command Default

No default behavior or values

Command Modes

XR EXEC mode

Command History

Release

Modification

Release 6.0

This command was introduced.

Usage Guidelines

No specific guidelines impact the use of this command.

Task ID

Task ID

Operations

mpls-ldp

read

mpls-static

read

Examples

The following example shows how to display MPLS OAM client information: 


RP/0/RP0/CPU0:router# show mpls oam client

Client Process: l2vpn_mgr Node: 0/RP0/CPU0 Pid: 7200 Service: 3
Client Process: mpls_ldp Node: 0/RP0/CPU0 Pid: 7201 Service: 2
Client Process: bgp Node: 0/RP0/CPU0 Pid: 7488 Service: 5

This table describes the significant fields shown in the display.

Table 1. show mpls oam client Command Field Descriptions

Field

Description

Client Process

Process of client.

show mpls oam database

To display MPLS OAM database information, use the show mpls oam database command in XR EXEC mode.

show mpls oam database { requests | tt-requests} [detail] [handle handle-value ]

Syntax Description

requests

Displays request database

tt-requests

Displays tree trace request database

detail

(Optional) Displays displayed information.

handle

(Optional) Displays handle information.

handle-value

Generic handle value. Range is from 0 to 4294967295.

Command Default

No default behavior or values

Command Modes

XR EXEC mode

Command History

Release

Modification

Release 6.0

This command was introduced.

Usage Guidelines

No specific guidelines impact the use of this command.

Task ID

Task ID

Operations

mpls-ldp

read

mpls-static

read

Examples

The following example shows how to display detailed MPLS OAM database information: 


RP/0/RP0/CPU0:router# show mpls oam database request detail

traceroute mpls ipv4

To learn the routes that packets follow when traveling to their Label Distribution Protocol (LDP) IPv4 destination, use the traceroute mpls command in XR EXEC mode.

traceroute mpls ipv4address/mask [destination start-address end-address address-increment] [exp exp-bits] [flags fec] [force-explicit-null] [output {interface type interface-path-id [nexthop nexthop-address] | | [nexthop nexthop-address]}] [reply {dscp dscp-value | reply mode {ipv4 | router-alert}}] [source source-address] [timeout timeout] [ttl value] [verbose] [fec-type {bgp | generic | ldp}]

Syntax Description

address/mask

Specifies the destination type as a label distribution protocol (LDP) prefix. Address prefix of the target and number of bits in the target address network mask.

destination start-address end-address address-increment

Specifies a network 127 address to be used as the destination address in the echo request packet.
start address

Start of the network address.

end address

End of the network address.

address increment

Incremental value of the network address.

exp exp-bits

(Optional) Specifies the MPLS experimental field value in the MPLS header for echo replies. Range is 0 to 7. Default is 0.

flags fec

(Optional) Specifies that forwarding equivalent class (FEC) stack checking is to be performed at transit routers.

force-explicit-null

(Optional) Forces an unsolicited explicit null label to be added to the MPLS label stack and allows LSP ping to be used to detect LSP breakages at the penultimate hop.

output interface

(Optional) Specifies the output interface in which echo request packets are sent.

type

Interface type. For more information, use the question mark (?) online help function.

interface-path-id

Physical interface or virtual interface.

Note

 

Use the show interfaces command to see a list of all interfaces currently configured on the router.

For more information, use the question mark (?) online help function.

nexthop

(Optional) Specifies the IP address for the next hop.

nexthop-address

(Optional) IP address for the next hop.

reply dscp dscp-value

(Optional) Specifies the differentiated service codepoint value for an MPLS echo reply.

reply mode { ipv4 | router-alert }

(Optional) Specifies the reply mode for the echo request packet.
ipv4

Reply with IPv4 UDP packet (this is the default)

router-alert

Reply with IPv4 UDP packet with router alert

source source-address

(Optional) Specifies the source address used in the echo request packet.

timeout timeoutt

(Optional) Specifies the timeout interval, in seconds. Range is from 0 to 3600. Default is 2.

ttl value

(Optional) Specifies the maximum number of hops (range is 1 to 255).

verbose

(Optional) Enables verbose output information, including MPLS echo reply, sender address of the packet, and return codes.

fec-type

(Optional) Specifies FEC type to be used.

bgp

Use FEC type as BGP

generic

Use FEC type as generic

ldp

Use FEC type as LDP

Command Default

exp exp-bits : 0

reply mode : IPv4

timeout timeout : 2

Command Modes

XR EXEC mode

Command History

Release

Modification

Release 6.0

This command was introduced.

Usage Guidelines


Note

The traceroute mpls command is not supported on optical LSPs. If an optical LSP is encountered along the LSPs path, it is treated as a physical interface.

For detailed configuration information about MPLS LSP trace operations, see System Monitoring Configuration Guide.

Task ID

Task ID

Operations

mpls-ldp

read, write

Examples

The following example shows how to trace a destination: 

RP/0/RP0/CPU0:router# traceroute mpls ipv4 7.7.7.7/32 destination 127.0.0.10 127.0.0.15 1


Tracing MPLS Label Switched Path to 7.7.7.7/32, timeout is 2 seconds

Codes: '!' - success, 'Q' - request not sent, '.' - timeout,
  'L' - labeled output interface, 'B' - unlabeled output interface,
  'D' - DS Map mismatch, 'F' - no FEC mapping, 'f' - FEC mismatch,
  'M' - malformed request, 'm' - unsupported tlvs, 'N' - no rx label,
  'P' - no rx intf label prot, 'p' - premature termination of LSP,
  'R' - transit router, 'I' - unknown upstream index,
  'X' - unknown return code, 'x' - return code 0

Type escape sequence to abort.

Destination address 127.0.0.10
  0 79.4.0.1 MRU 1500 [Labels: 24008 Exp: 0]
L 1 79.4.0.2 MRU 1500 [Labels: implicit-null Exp: 0] 5 ms
! 2 178.0.0.1 4 ms

Destination address 127.0.0.11
  0 79.5.0.1 MRU 1500 [Labels: 24008 Exp: 0]
L 1 79.5.0.2 MRU 1500 [Labels: implicit-null Exp: 0] 3 ms
! 2 178.0.0.1 2 ms

Destination address 127.0.0.12
  0 79.1.0.1 MRU 1500 [Labels: 24008 Exp: 0]
L 1 79.1.0.2 MRU 1500 [Labels: implicit-null Exp: 0] 3 ms
! 2 178.0.0.1 2 ms

Destination address 127.0.0.13
  0 79.2.0.1 MRU 1500 [Labels: 24008 Exp: 0]
L 1 79.2.0.2 MRU 1500 [Labels: implicit-null Exp: 0] 3 ms
! 2 178.0.0.1 2 ms

Destination address 127.0.0.14
  0 79.4.0.1 MRU 1500 [Labels: 24008 Exp: 0]
L 1 79.4.0.2 MRU 1500 [Labels: implicit-null Exp: 0] 3 ms
! 2 178.0.0.1 2 ms

Destination address 127.0.0.15
  0 79.5.0.1 MRU 1500 [Labels: 24008 Exp: 0]
L 1 79.5.0.2 MRU 1500 [Labels: implicit-null Exp: 0] 3 ms
! 2 178.0.0.1 3 ms

The following example shows how to trace a destination with FEC type specified as generic and verbose option: 

RP/0/RP0/CPU0:router# router#traceroute mpls ipv4 7.7.7.7/32 fec-type generic output interface TenGigE 0/0/0/11.1 nexthop 79.1.0.2 verbose


Tracing MPLS Label Switched Path to 7.7.7.7/32, timeout is 2 seconds

Codes: '!' - success, 'Q' - request not sent, '.' - timeout,
  'L' - labeled output interface, 'B' - unlabeled output interface,
  'D' - DS Map mismatch, 'F' - no FEC mapping, 'f' - FEC mismatch,
  'M' - malformed request, 'm' - unsupported tlvs, 'N' - no rx label,
  'P' - no rx intf label prot, 'p' - premature termination of LSP,
  'R' - transit router, 'I' - unknown upstream index,
  'X' - unknown return code, 'x' - return code 0

Type escape sequence to abort.

  0 79.1.0.1 79.1.0.2 MRU 1500 [Labels: 24008 Exp: 0]
L 1 79.1.0.2 178.0.0.1 MRU 1500 [Labels: implicit-null Exp: 0] 4 ms, ret code 8
! 2 178.0.0.1 3 ms, ret code 3

traceroute mpls multipath

To discover all possible paths of an LSP between the ingress and egress routers, use the traceroute mpls multipath command in XR EXEC mode.

traceroute mpls multipath ipv4 address/mask [destination start-address/ end-address ] [exp exp-bits] [flags fec] [force-explicit-null] [hashkey ipv4 bitmap bit-size] [interval min-send-delay] [output {interface type interface-path-id [nexthop nexthop-address] | | [nexthop nexthop-address]}] [reply {dscp dscp-value | reply mode {ipv4 | router-alert}}] [retry-count count] [source source-address] [timeout timeout] [ttl value] [verbose] [fec-type {bgp | generic | ldp}]

Syntax Description

ipv4

Specifies the destination type as a Label Distribution Protocol (LDP) IPv4 address.

address/mask

Address prefix of the target and number of bits in the target address network mask.

destination start-address end-address

(Optional) Specifies a network 127 address to be used as the destination address in the echo request packet.
start-address

Start of the network address.

end-address

End of the network address.

exp exp-bits

(Optional) Specifies the MPLS experimental field value in the MPLS header for echo replies. Range is 0 to 7. Default is 0.

flags fec

(Optional) Specifies that forwarding equivalent class (FEC) stack checking is to be performed at transit routers.

force-explicit-null

(Optional) Forces an unsolicited explicit null label to be added to the MPLS label stack and allows LSP ping to be used to detect LSP breakages at the penultimate hop.

hashkey ipv4 bitmap bit-size

(Optional) Allows user control of the hash key/multipath settings. Range is 0 to 256. The default is 32.

interval min-send-delay

(Optional) Specifies a send interval, in milliseconds, between requests. Range is 0 to 3600000. Default is 0.

output interface

(Optional) Specifies the output interface where echo request packets are sent.

type

Interface type. For more information, use the question mark (?) online help function.

interface-path-id

Physical interface or virtual interface.

Note

 

Use the show interfaces command to see a list of all interfaces currently configured on the router.

For more information, use the question mark (?) online help function.

nexthop

(Optional) Specifies the IP address for the next hop.

nexthop-address

(Optional) IP address for the next hop.

reply dscp dscp-value

(Optional) Specifies the differentiated service codepoint value for an MPLS echo reply.

reply mode [ ipv4 | router-alert ]

(Optional) Specifies the reply mode for the echo request packet.
ipv4

Reply with IPv4 UDP packet (this is the default)

router-alert

Reply with IPv4 UDP packet with router alert

retry-count count

(Optional) Specifies the number of retry attempts during multipath LSP traceroute. A retry is attempted if an outstanding echo request

  • times out waiting for the corresponding echo reply.
  • fails to find a valid destination address set to exercise a specific outgoing path. Range is 0 to 10. Default is 3.

source source-address

(Optional) Specifies the source address used in the echo request packet.

timeout timeout

(Optional) Specifies the timeout interval, in seconds. Range is from 0 to 3600. Default is 2.

ttl value

(Optional) Specifies the maximum number of hops (range is 1 to 255).

verbose

(Optional) Enables verbose output information, including MPLS echo reply, sender address of the packet, and return codes.

fec-type

(Optional) Specifies FEC type to be used.

bgp

Use FEC type as BGP

generic

Use FEC type as generic

ldp

Use FEC type as LDP

Command Default

exp exp-bits : 0

hashkey ipv4 bitmap bit-size : 4

interval min-send-delay : 0

reply mode : IPv4

retry-count : 3

timeout timeout : 2

Command Modes

XR EXEC mode

Command History

Release

Modification

Release 6.0

This command was introduced.

Usage Guidelines

The hashkey ipv4 bitmap keyword and bit-size value control how many addresses are encoded in the DSMAP multipath field. Larger values allow more coverage of equal cost multiple paths throughout the network, but with more processing at the head, mid, and tail routers.

Task ID

Task ID

Operations

mpls-ldp

read, write

Examples

The following example shows how to specify the destination type as an LDP IPv4 prefix: 


RP/0/RP0/CPU0:router# traceroute mpls multipath ipv4 7.7.7.7/32 verbose force-explicit-null
  
  Starting LSP Path Discovery for 7.7.7.7/32

Codes: '!' - success, 'Q' - request not sent, '.' - timeout,
  'L' - labeled output interface, 'B' - unlabeled output interface,
  'D' - DS Map mismatch, 'F' - no FEC mapping, 'f' - FEC mismatch,
  'M' - malformed request, 'm' - unsupported tlvs, 'N' - no rx label,
  'P' - no rx intf label prot, 'p' - premature termination of LSP,
  'R' - transit router, 'I' - unknown upstream index,
  'X' - unknown return code, 'x' - return code 0

Type escape sequence to abort.

L!
Path 0 found,
 output interface TenGigE0/0/0/11.1 nexthop 79.1.0.2
 source 79.1.0.1 destination 127.0.0.0
  0 79.1.0.1 79.1.0.2 MRU 1500 [Labels: 24008/explicit-null Exp: 0/0] multipaths 0
L 1 79.1.0.2 178.0.0.1 MRU 1500 [Labels: implicit-null/explicit-null Exp: 0/0] ret code 8 multipaths 1
! 2 178.0.0.1, ret code 3 multipaths 0
L!
Path 1 found,
 output interface TenGigE0/0/0/11.2 nexthop 79.2.0.2
 source 79.2.0.1 destination 127.0.0.0
  0 79.2.0.1 79.2.0.2 MRU 1500 [Labels: 24008/explicit-null Exp: 0/0] multipaths 0
L 1 79.2.0.2 178.0.0.1 MRU 1500 [Labels: implicit-null/explicit-null Exp: 0/0] ret code 8 multipaths 1
! 2 178.0.0.1, ret code 3 multipaths 0
L!
Path 2 found,
 output interface TenGigE0/0/0/11.4 nexthop 79.4.0.2
 source 79.4.0.1 destination 127.0.0.0
  0 79.4.0.1 79.4.0.2 MRU 1500 [Labels: 24008/explicit-null Exp: 0/0] multipaths 0
L 1 79.4.0.2 178.0.0.1 MRU 1500 [Labels: implicit-null/explicit-null Exp: 0/0] ret code 8 multipaths 1
! 2 178.0.0.1, ret code 3 multipaths 0
L!
Path 3 found,
 output interface TenGigE0/0/0/11.5 nexthop 79.5.0.2
 source 79.5.0.1 destination 127.0.0.0
  0 79.5.0.1 79.5.0.2 MRU 1500 [Labels: 24008/explicit-null Exp: 0/0] multipaths 0
L 1 79.5.0.2 178.0.0.1 MRU 1500 [Labels: implicit-null/explicit-null Exp: 0/0] ret code 8 multipaths 1
! 2 178.0.0.1, ret code 3 multipaths 0

Paths (found/broken/unexplored) (4/0/0)
 Echo Request (sent/fail) (8/0)
 Echo Reply (received/timeout) (8/0)
 Total Time Elapsed 44 ms

The following example shows how to specify the FEC type as LDP with verbose option: 


RP/0/RP0/CPU0:router# traceroute mpls multipath ipv4 7.7.7.7/32 fec-type ldp output interface TenGigE 0/0/0/11 nexthop 79.1.0.2
  
Starting LSP Path Discovery for 7.7.7.7/32

Codes: '!' - success, 'Q' - request not sent, '.' - timeout,
  'L' - labeled output interface, 'B' - unlabeled output interface,
  'D' - DS Map mismatch, 'F' - no FEC mapping, 'f' - FEC mismatch,
  'M' - malformed request, 'm' - unsupported tlvs, 'N' - no rx label,
  'P' - no rx intf label prot, 'p' - premature termination of LSP,
  'R' - transit router, 'I' - unknown upstream index,
  'X' - unknown return code, 'x' - return code 0

Type escape sequence to abort.

L!
Path 0 found,
 output interface TenGigE0/0/0/11.1 nexthop 79.1.0.2
 source 79.1.0.1 destination 127.0.0.0
  0 79.1.0.1 79.1.0.2 MRU 1500 [Labels: 24008 Exp: 0] multipaths 0
L 1 79.1.0.2 178.0.0.1 MRU 1500 [Labels: implicit-null Exp: 0] ret code 8 multipaths 1
! 2 178.0.0.1, ret code 3 multipaths 0

Paths (found/broken/unexplored) (1/0/0)
 Echo Request (sent/fail) (2/0)
 Echo Reply (received/timeout) (2/0)
 Total Time Elapsed 10 ms