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Traceroute discovers the IP routes along which packets are forwarded. To do this, Traceroute sends an IP packet to the target host and back to the switch. The Traceroute page allows the user to view each hop between the switch and the target host as well as the round-trip time to each stop. A Traceroute can be used by the user to discover the path which the packet takes along the network to reach the destination and from this it allows the user to measure the transit delay of the packets which are traversing through the network.
In a real time scenario, a traceroute can be used if the user is having some connectivity problems and the user needs to find whether the packets are delivered to the destination or not. Traceroute can exactly point out where the packets are being dropped if such a problem exists.
This article explains how to configure a traceroute on ESW2-350G Switches.
Step 1. Log in to the web configuration utility and choose Administration > Traceroute. The Traceroute page opens:
Step 2. Choose whether the hosts will be identified by their IP address or name in the Host Definition field.
Step 3. If the host is identified by IP address, choose either IPv4 or IPv6 to indicate that the IP address will be entered in the chosen format. IP version 6 is available only when IPv6 is configured on the switch.
Step 4. If you chose IP Version 6 in Step 3 then choose the type of IPv6 address in the IPv6 Address Type field:
• Link Local — The IPv6 address identifies hosts on a single network link. A link local address is not routable and can be used for communication only on the local network.
• Global — The IPv6 address is a global Unicast IPv6 type that is visible and reachable from other networks.
Step 5. If Link Local is chosen for the IPv6 address type in Step 4, choose the interface where it is received from the Link Local Interface drop-down list.
Step 6. Enter the IPv6 address in the Host IP Address/Name field.
Step 7. If you chose IP Version 4 in Step 3 then enter the IPv4 address or host name of the device in the Host IP Address/Name field.
Step 8. Time To Live (TTL) is the maximum number of stops that the Traceroute permits. This is used to prevent a case where the sent frame goes into an endless loop. The Traceroute command terminates when the destination is reached or when this value is reached. Click User Defined and enter the required TTL value in the TTL field. To use the default value of 30, click the Use Default radio button.
Step 9. Timeout is the maximum amount of time that the system will wait for a frame to return before declaring it lost in the Timeout field. Click User Defined and enter the required timeout value in the Timeout field. You may click the Use Default radio button to use the default value of 3.
Step 10. Click Activate Traceroute.
A page is displayed that shows the Round Trip Time (RTT) and the status of each traceroute in the fields shown.
• Index — Displays the number of the hop.
• Host — Displays a stop along the host to the destination.
• Round Trip Time (RTT) — It has RTT1, RTT2, RTT3 and displays the round trip time in (ms) for the 1-3rd frame and the status of 1-3rd operation.
Step 11. Click Back to go back to the Traceroute page.