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Cajun P550/P880 /P882 Switch User Guide
Analyzing Network Performance Using RMON and Ethernet Statistics
19-7
Viewing
Network
Statistics Using
the CLI
To view network statistics using the CLI, enter the following
command in Priv mode:
cajun# show ethernet counters <cr|mod-num|mod-
swport-spec>
Refer to the Cajun™ P550™/P880/P882 Command Line Interface
Reference Guide for Version 5.0 for details about this command.
Jabbers Jabbers indicate that devices on
the networks are sending
improper electrical signals.
Because Ethernet uses electrical
signalling to determine whether
or not it is okay to transmit, a
jabber condition can halt all
traffic on a segment.
Possible causes:
• Bad network interface card
• Repeater network with
looped traffic
Possible actions (respectively):
• Replace the network
interface card.
• Rewire network to remove
the loop.
Collisions
(half-duplex
links only)
Counts number of times that
packets have collided on the
network. Collisions increase as
network use of shared segments
increases. Therefore, if the
collision rate increases without
an increase of network use, it
might indicate a problem.
Guidelines for appropriate
collision rates are:
• 10 percent: Normal
collision rate for shared
Ethernet segment.
• 30 percent: Collisions begin
to interfere with
performance.
• 70 percent: Practical limit
for network to remain
functioning.
A full-duplex link should not
show collision activity. Collisions
are rare in a switched network,
unless your switched segments
attach to multiple ends stations
(a legal configuration option).
Possible causes:
• Busy network
• Broken adapter (not
listening before
broadcasting)
• Network loop
Possible actions (respectively):
• If you have multiple stations
on a switch segment,
reconfigure network into
segments with fewer
stations.
• Isolate each adapter to see if
the problem ceases.
• Activate spanning tree to
resolve loops automatically.
• Ensure that there are no
connections to the same
station where both
connections are
simultaneously active.
Table 19-1. Ethernet Interface Statistics Dialog Box Fields continued
Statistic Indicates Actions