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traceroute mpls rsvp

date_range 19-Nov-23

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Syntax

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traceroute mpls <rsvp> lsp-name
<detail>
<egress>
<exp>
<logical-system>
<multipoint>
<no-resolve>
<retries>
<source source-address>
<ttl>

Description

Trace route to a remote host for an MPLS LSP signaled by RSVP. Use traceroute mpls rsvp as a debugging tool to locate MPLS label-switched path (LSP) forwarding issues in a network. (Currently supported for IPv4 packets only.)

Options

`lsp-name`	Specify the name of the LSP to be traced.
detail	(Optional) Display detailed output.
egress	(Optional) Request that a specific point-to-multipoint egress node reply to the trace route. The trace route would follow the associated sub-LSP to the egress node.
exp	(Optional) Specify the class of service to use when sending probes. The range of values is 0 through 7. The default value is 7.
logical-system	(Optional) Specify the name of the logical system for the traceroute attempt.
multipoint	(Optional) Perform a trace route on a point-to-multipoint LSP.
no-resolve	(Optional) Specify not to resolve the hostname that corresponds to the IP address.
retries	(Optional) Specify the number of times to resend probe. The range of values is 1 through 9. The default value is 3.
source `source-address`	(Optional) Specify the source address of the outgoing traceroute packets.
ttl	(Optional) Specify the number of hops to follow before forcing the trace route to quit.

Required Privilege Level

network

Output Fields

Table 1 describes the output fields for the traceroute mpls rsvp lsp-name and traceroute mpls rsvp lsp-name detail commands. Output fields are listed in the approximate order in which they appear.

Table 1: traceroute mpls rsvp Output Fields
Field Name	Field Description	Level of Output
Probe options	Probe options specified in the `traceroute mpls rsvp lsp-name` command.	all levels
ttl	Time-to-live value of the labeled packet.	none specified
Label	MPLS label used to forward the packets along the LSP.	none specified
Protocol	Signaling protocol used. For this command, it is RSVP-TE.	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). Displays `Success` if the trace to a hop is successful or `Egress` if the trace has reached the last router on the path.	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`
Sender timestamp	Displays the timestamp when the MPLS echo request is sent to the next hop.	`detail`
Receiver timestamp	Timestamp when the echo request from the previous hop is received and acknowledged with an echo response by the next hop.	`detail`
Response time	Time for the echo request to reach the receiver.	`detail`
MTU	Size of the largest packet that includes the label stack forwarded to the next hop.	`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`
Path	Displays the sub-lsp path number for this traceroute, the interface used, and the destination address.	all levels

Sample Output

traceroute mpls rsvp
traceroute mpls rsvp detail
traceroute mpls rsvp multipoint (branch node for sub-LSPs)
traceroute mpls rsvp multipoint (single-hop sub-LSPs)