traceroute mpls ldp
Syntax
traceroute mpls <ldp> fec <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
an MPLS label-switched path signaled by the LDP. Use traceroute
mpls ldp as a debugging tool to locate MPLS label-switched path
forwarding issues in a network. (Currently supported for IPv4 packets
only.)
Options
| 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.
|
| detail | (Optional) Display detailed output. |
| exp exp | (Optional) Specify the class-of-service to use when sending probes.
|
| fanout fanout-number | (Optional) Specify the maximum number of nexthops to search per node.
|
| 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.
|
| pipe-mode | (Optional) Specify to trace only nodes that understand LDP FEC. In an interoperation with other vendor devices or devices running
Junos OS Release that do not support tracing of hierarchical LSPs
as described in RFC 6424, continuous non-complaint probe status is
displayed in the Note:
Even after using the |
| retries retries-number | (Optional) Specify the number of times to resend probe values.
|
| 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.
|
| update | (Optional) Update database contents with traceroute results. |
| wait seconds | (Optional) Specify the number of seconds to wait before resending a probe.
|
Required Privilege Level
network
Output Fields
Table 1 describes the output fields for the traceroute mpls ldp fec command and the traceroute mpls ldp fec detail commands. Output fields are listed in
the approximate order in which they appear.
Field Name |
Field Description |
Level of Output |
|---|---|---|
Probe options |
Probe options specified in the |
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 ldp
user@router> traceroute mpls ldp 4.4.4.4
Probe options: ttl 64, retries 3, wait 10, paths 16, exp 7, fanout 16
ttl Label Protocol Address Previous Hop Probe Status
1 100016 LDP 24.24.24.1 (null) Success
2 100000 LDP 20.20.20.2 24.24.24.1 Success
3 3 LDP 22.22.22.4 20.20.20.2 Egress
Path 1 via fe-0/3/3.101 destination 127.0.0.64traceroute mpls ldp detail
user@router> traceroute mpls ldp 4.4.4.4 detail
Probe Options: ttl 64, retries 3, wait 10, paths 3, exp 7
Hop 24.24.24.1 Depth 1
Parent (null)
Return code: Label switched at stack-depth 1
Response time 165.93 msec
Multipath type: IP bitmask
Address Range 1: 127.0.0.0 ~ 127.0.3.255
Label Stack:
Label 1 Value 100032 Protocol LDP
Hop 20.20.20.2 Depth 2
Parent 24.24.24.1
Return code: Upstream interface index unknown label-switched at stack-depth 1
Response time 19.05 msec
Multipath type: IP bitmask
Address Range 1: 127.0.0.0 ~ 127.0.3.255
Label Stack:
Label 1 Value 100000 Protocol LDP
Hop 22.22.22.4 Depth 3
Parent 20.20.20.2
Return code: Egress-ok at stack-depth 1
Response time 0.79 msec
Multipath type: None
Label Stack:
Label 1 Value 3 Protocol LDP
Release Information
Command introduced in Junos OS Release 8.4.