Unusual Network Activity - HP J2415A Installation And Reference Manual

Troubleshooting

Unusual Network Activity

Network activity that exceeds accepted norms may indicate a hub or
network problem. Most of the time, the unusual network activity can be
removed by making sure that your network cabling and network topology
adhere to the standards and requirements described in the HP 100VG
AnyLAN Technology Guide.
Use HP Stack Manager to view the status of the LAN ports and to retrieve
counter values. The counters can provide indications of unusual network
activity. The following table indicates some typical error symptoms and the
most likely causes of those symptoms:
When using the bridge functionality of the HP J2414B 100VG/ET
SNMP/Bridge module, see the troubleshooting chapter in the HP J2414B
100VG/ET SNMP/Bridge Module Installation and Reference Guide.
3-6
Symptom
High value for the You may be using a bundled cable on a promiscuous port in a
Data Error Frame network that is transmitting many group-addressed packets.
counter in HP Stack Make sure that promiscuous ports, for example the Uplink
Manager counters port in a hub-to-hub connection, are always connected using
screen unbundled cable. Note that this cabling error may result in
high Data Error Frame counts on other ports than just the
promiscuous port.
High value for the There may be excessive high-priority traffic on the network.
Priority Promotions Make sure that only those end nodes that are authorized to
counter in HP Stack run in high-priority mode are configured to do so.
Manager counters High-priority mode is set by configuring the LAN adapter
screen driver appropriately. You can limit which nodes are allowed
to send high-priority traffic in the Port Settings screen in
HP Stack Manager—set the port configuration to "Normal
Priority Only".
Cause