Troubleshooting Guide

Running a traceroute test
Use traceroute to determine the route packets take through a network to a destination.
Before you begin
• You must log on to at least Privileged EXEC mode in ACLI.
About this task
Ping and traceroute can fail for VRF routes if you use large packet sizes for the operation. Do not
use packet sizes larger than the following:
• Ping for VRF: 1480 bytes
• Traceroute for VRF: 1444 bytes
Procedure
Run a traceroute test:
traceroute WORD<0-256> [<1-1176>] [-m <1-255>] [-p <1-65535>] [-q
<1-255>] [-v] [-w <1-255>] [source <WORD 1-256>] [vrf <WORD 1-16>]
Example
VSP-4850GTSPWR+:1> enable
Run traceroute test, with a probe packet size of 200 and a max time to live of 60:
VSP-4850GTSPWR+:1# traceroute 46.11.10.33 200 —m 60
Run a traceroute test for IPv6 address 2001:db8::.
VSP-4850GTSPWR+:1#traceroute 2001:db8::
Variable definitions
Use the data in the following table to use the traceroute command.
Variable Value
WORD<0-256> Specifies the destination IPv4 or IPv6 address, or hostname.
-m <1-255> Specifies the maximum time-to-live (TTL).
-p <1-65535> Specifies the base UDP port number.
-q <1-255> Specifies the number of probes per TTL.
-v Specifies verbose mode (detailed output).
-w <1-255> Specifies the wait time for each probe.
<1-1176> Specifies the size of the probe packet.
source <WORD 1-256> Specifies the source IP address.
vrf <WORD 1-16> Specifies the VRF instance by VRF name for IPv4 addresses
only.
Running a traceroute test
January 2017 Troubleshooting 119
Comments on this document? [e-mail]