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Troubleshooting Network Connections Using Traceroute

Traceroute is a diagnostic tool that enables you to display the route that a packet takes to reach the destination and measure transit delays of packets across an Internet Protocol (IP) network. You can use traceroute to troubleshoot and identify points of failure in your switching network. In traceroute, the source device sends three Internet Control Message Protocol (ICMP) echo request packets to the destination device. This is done sequentially till the source receives an ICMP echo reply message from the destination device. The time-to-live (TTL) value is used in determining the number of intermediate devices that the packets traverse before reaching the destination device.

You can use traceroute for EX Series switches (with or without ELS), QFX Series switches, and QFabric systems.

Procedure

To start a traceroute from the selected device to another device in your network:

  1. Select either IP or HostName in the Remote Host Details box.
  2. Type the IP address or hostname for the device to which you want to start a traceroute.
  3. Click Trace to use the default settings and start the traceroute or select the plus (+) symbol to use the Advanced Options. The fields in Advanced Options are described in Table 299.

Table 299: Traceroute Advanced Options Field Descriptions

Field

Description

Default

Interface

Sends the Internet Control Message Protocol (ICMP) echo request packets on the interface you specify. If you do not specify this option, ICMP packets are sent on all interfaces.

Select a value from the list.

Time To Live

Indicates the time-to-live hop count for the ICMP echo request packets. Default value is 30. Valid values are 1 through 255.

30

Wait Interval

Indicates the amount of time in seconds between echo requests. Default value is 5. Valid values are 1 through 24.

5

Type of Service

Sets the type-of-service (ToS) field in the IP header of the echo packets. The range of values is 0 through 255. If the routing platform does not support ToS, the field is ignored.

0

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