Alcatel-Lucent 5620 Troubleshooting Manual page 251

Using the netstat command on the client may help troubleshoot network throughput
problems. When an Ethernet LAN is highly congested, the actual throughput slows
down. This is caused by packets colliding on the LAN as multiple machines begin to
transmit at approximately the same time, for example, when multiple 5620 SAM client
GUIs or OSS applications are performing simultaneous tasks.
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Alcatel-Lucent 5620 Service Aware Manager, Release
3HE 05723 AAAD TQZZA Edition 01
Client GUI windows may respond more slowly than normal during
resynchronizations of managed devices. Repeat the client GUI window action
when the resynchronization is complete.
Check for LAN throughput issues.
i Open a shell console window.
ii Enter the following at the console prompt to display local network-interface
transmission data over a period of time:
netstat -i s ↵
where s is the time, in seconds, over which you want to collect data. Alcatel-Lucent
recommends that you start with 50 s
iii Review the output. The following is sample netstat output:
netstat -i 5
input le0
packets errs packets errs colls packets errs packets errs
colls
6428555 41 541360
49998
22 0 0
71 0 7
This sample displays the number of input and output packets, errors and
collisions on the le0 interface. One column displays the totals for all
interfaces. This sample only has one interface, so both sets of columns
display the same data.
Calculate the number of collisions as a percentage of the number of output
packets. For example, according to the last line of output, there were three
collisions and seven output packets resulting in a 42% rate.
This number is high, but the time in which the sampling was obtained (5 s),
was low. Change the sample rate to, for example, 50 s for an accurate
sampling of the network throughput.
When collisions are between 2% and 5%, congestion on the interface is within
the normal operating range.
Troubleshooting Guide
9 — Troubleshooting 5620 SAM clients
output input
80 49998 6454787 41
0 0 22
0 3 71
8.0 R4 Aug 2010
(Total) output
567592 80
0 0 0
0 7 0
9-5
0
3