Finisar Surveyor, User Manual

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10-105
Expert Features
MAC Layer
10
Excessive ARP
Counter
The Excessive ARP counter increments when a change in the number of ARP
requests per second exceeds a threshold. A count of all Excessive ARP events
displays in the
Overview
counters of Expert View. A threshold for this counter can
be set in Expert Alarms.
Expert Symptom
Excessive ARP events are automatically logged as expert symptoms. The
Symptom
Summary
field provides information about the rate of change for ARP requests. For
example:
Rate of change of ARP Requests=20
This threshold value for this symptom can be changed. The default threshold is a
delta of 10 ARP requests per second.
Diagnostic Details
__________________________________________________________________
Problem Description:
The expert threshold for ARP Broadcasts has been exceeded for this segment,
resulting in an Excessive ARP symptom.
__________________________________________________________________
Probable Cause(s):
1. The network is overloaded.
2. Variations in application traffic patterns.
3. Heavy Internet usage.
4. Too many new TCP/IP connections.
__________________________________________________________________
Recommended Action(s):
1. Load balance your network.
2. If you see repeated overloads and too many retransmissions, your router or switch may
need upgrading.
Your network may have just come up after a power down;
if so, ignore this problem.
3. If there is a high level of Internet usage, then ignore this message.