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Expert Features
Network Layer
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ICMP Source Quench
Counter
ICMP Source Quench events are counted in the ICMP All Errors counter. A count
of all ICMP errors displays in the
Overview counters of Expert View. A threshold
can be set in Expert Alarms for all ICMP errors.
Expert Symptom
ICMP Source Quench events are automatically logged as expert symptoms. The
Symptom Summary field provides information about the IP addresses involved.
Examples are:
Sent by Destination Host [206.250.228.69] to
[206.250.228.11]. SA=[206.250.228.11] DA=[206.250.228.69]
Sent by Gateway Host [206.250.228.61] to [206.250.228.11]
when forwarding to Destination [206.250.228.69].
SA=[206.250.228.11] DA=[206.250.228.69]
Diagnostic Details
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Problem Description:
An ICMP Source Quench message has been sent.
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Probable Cause(s):
1. If a router has a buffer space problem, it may send this message.
2. A host may send this message if it can’t keep up with processing of packets
and is reaching its limits.
3. The network may be overloaded.
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Recommended Action(s):
1. Check the routing table buffer statistics and upgrade the router if problem
persists.
2. If the message is from a host, you may need to upgrade its resources.
3. Increase the bandwidth of your network to reduce network overload.
4. If the message is infrequent, ignore it. The problem will rectify itself.