0536 - IP Connection Excess Retransmits
An SCTP association has excessive retransmissions. The retransmission errors may cause a connection to congest and fail in the presence of a sufficiently high load.
Note:
IP Connection UAMs 0086 (Congested), 0535 (Restricted), and 0536 (Excess Retransmits) conditions can occur simultaneously. However, only one alarm per device can be displayed at a time. If two or more are present, the display of these alarms is prioritized as follows:- 0086 - IP Connection Congested (MSUs are being dropped)
- 0536 - IP Connection Excess Retransmits (MSUs may be dropped. The EAGLE 5 ISS sustains a certain rate of dropped MSUs without triggering this alarm, then issues UIM 0536 when that rate is exceeded.)
- 0535 - IP Connection Restricted (MSUs are being transmitted at reduced rate. A path of a multi-homed association has failed. )
Example
RLGHNCXA21W 06-12-07 12:01:43 EST EAGLE 35.6.0
* 1111.0536 * IP7 assoc1234567890 IP Connection Excess Retransmits
Alarm Level: Minor
Recovery
This error may be due to:
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Misconfiguration or improper tuning of SCTP attributes to match the network conditions and traffic volumes
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Packet loss
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Excessive round-trip times
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The receive buffer of the SCTP peer being full for extended periods (probes by Eagle SCTP to update window size may result in discards by the peer)
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Timer settings that are too close in value