4000 Router Series Network Management and Monitoring Command Reference

tracert

Use tracert to trace the path the packets traverse from source to destination.

Syntax

vpn-instance-name | -w timeout ] * host

Views

Any view

Predefined user roles

network-admin

Parameters

-a source-ip: Specifies the source IP address of a tracert packet. It must be a valid IP address configured

on the device. If this option is not specified, the source IP address of a tracert packet is the primary IP

address of the outbound interface of this tracert packet.

-f first-ttl: Specifies the first TTL (the maximum number of hops allowed for the first packet). The first-ttl

argument is in the range of 1 to 255. The default value is 1. It must be smaller than the value of the max-ttl

argument.

-m max-ttl: Specifies the maximum TTL (the maximum number of hops allowed for a packet). The max-ttl

argument is in the range of 1 to 255. The default value is 30. It must be greater than the value of the

first-ttl argument.

-p port: Specifies the UDP port number of the destination. The port argument is in the range of 1 to 65535.

The default value is 33434. It is unnecessary to modify this option.

-q packet-number: Specifies the number of probe packets sent each time. The packet-number argument

is in the range of 1 to 65535. The default value is 3.

-t tos: Specifies the ToS value in a tracert packet. The value range is 0 to 255 and the default is 0.

-vpn-instance vpn-instance-name: Specifies the MPLS L3VPN instance to which the destination belongs,

where the vpn-instance-name argument is a case-sensitive string of 1 to 31 characters. If the destination

is on the public network, do not specify this option.

-w timeout: Specifies the timeout time of the reply packet of a probe packet. The timeout argument is in

the range of 1 to 65535 milliseconds. The default value is 5000 milliseconds.

host: IP address or host name for the destination. The host name is a case-insensitive string of 1 to 253

characters, which can contain letters, digits, and special characters such as hyphen (-), underscore (_),

and dot (.).

Usage guidelines

After having identified network failure with the ping command, use the tracert command to locate failed

nodes.

The output of the tracert command includes IP addresses of all the Layer 3 devices that the packets

traverse from source to destination. Asterisks (* * *) are displayed if the device cannot reply with an

ICMP error message (probably because the destination is unreachable or sending ICMP

timeout/destination unreachable packets is disabled).

To abort the tracert operation during the execution of the command, press the break key sequence

combination (Ctrl+C by default).