Unusual Network Activity; General Problems - HP ProCurve series 2500 Management And Configuration Manual

Troubleshooting

Unusual Network Activity

Unusual Network Activity

Network activity that exceeds accepted norms may indicate a hardware
problem with one or more of the network components, possibly including the
switch. Unusual network activity is usually indicated by the LEDs on the front
of the switch or measured with the switch console interface or with a network
management tool such as the HP TopTools for Hubs & Switches. Refer to the
Installation Guide you received with the switch for information on using
LEDs to identify unusual network activity.
A topology loop can also cause excessive network activity. The event log "FFI"
messages can be indicative of this type of problem.

General Problems

The network runs slow; processes fail; users cannot access servers or
other devices. Broadcast storms may be occurring in the network. These
may be due to redundant links between nodes.
Duplicate IP Addresses. This is indicated by this Event Log message:
Duplicate IP Addresses in a DHCP Network. If you use a DHCP server
to assign IP addresses in your network and you find a device with a valid IP
address that does not appear to communicate properly with the server or other
devices, a duplicate IP address may have been issued by the server. This can
occur if a client has not released a DHCP-assigned IP address after the
intended expiration time and the server "leases" the address to another device.
This can also happen, for example, if the server is first configured to issue IP
addresses with an unlimited duration, then is subsequently configured to issue
11-6
• If you are configuring a port trunk, finish configuring the ports in the
trunk before connecting the related cables. Otherwise you may inad-
vertently create a number of redundant links (i.e. topology loops)
that will cause broadcast storms.
• Turn on Spanning Tree Protocol to block redundant links (i.e. topol-
ogy loops)
• Check for FFI messages in the Event Log.
ip: Invalid ARP source: IP address on IP address
where: both instances of IP address are the same address, indicating the
switch's IP address has been duplicated somewhere on the network.