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Alert Types
The following table lists the types of alerts that can be generated.
Table 3-2. Alert Strings and Descriptions
Alert String Alert Description
First Time Install Important installation information for your switch.
Too many undersized/giant packets A device connected to this port is transmitting packets shorter than 64 bytes or
longer than 1518 bytes (longer than 1522 bytes if tagged), with valid CRCs (unlike
runts, which have invalid CRCs).
Excessive jabbering A device connected to this port is incessantly transmitting packets (“jabbering”),
detected as oversized packets with CRC errors.
Excessive CRC/alignment errors A high percentage of data errors has been detected on this port. Possible causes
include:
• Faulty cabling or invalid topology.
• Duplex mismatch (full-duplex configured on one end of the link, half-duplex
configured on the other)
• A malfunctioning NIC, NIC driver, or transceiver
Excessive late collisions Late collisions (collisions detected after transmitting 64 bytes) have been
detected on this port. Possible causes include:
• An overextended LAN topology
• Duplex mismatch (full-duplex configured on one end of the link, half-duplex
configured on the other)
• A misconfigured or faulty device connected to the port
High collision or drop rate A large number of collisions or packet drops have occurred on the port. Possible
causes include:
• A extremely high level of traffic on the port
• Duplex mismatch
• A misconfigured or malfunctioning NIC or transceiver on a device connected
to this port
• A topology loop in the network
Excessive broadcasts An extremely high percentage of broadcasts was received on this port. This
degrades the performance of all devices connected to the port. Possible causes
include:
• A network topology loop—this is the usual cause
• A malfunctioning device, NIC, NIC driver, or software package
Network Loop Network loop has been detected by the switch.
Loss of Link Lost connection to one or multiple devices on the port.