Avaya Cajun P882 User Manual page 607

Statistic
Jabbers
Collisions
(half-duplex
links only)
CLI Command
Avaya P550R, P580, P880, and P882 Multiservice Switch User Guide, v5.3.1
Analyzing Network Performance By Using RMON and Ethernet Statistics
Table 19-1. Ethernet Interface Statistics Web Page Fields
Indicates
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.
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).
To view network statistics using the CLI, enter the following
command in Privileged mode:
<configure># show ethernet counters <cr|mod-
num|mod-swport-spec>
Refer to the Command Reference Guide for the Avaya P550R, P580, P880,
and P882 Multiservice Switches, v5.3.1 for details about this command.
Actions
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.
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.
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