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Troubleshooting
Unusual Network Activity
Troubleshooting
IGMP-Related Problems
IP Multicast (IGMP) Traffic Does Not Reach IGMP Hosts or a Multicast
Router Connected to a Port. IGMP must be enabled on the switch and the
affected port must be configured for “Auto” or “Forward” operation.
IP Multicast Traffic Floods Out All Ports; IGMP Does Not Appear To
Filter Traffic. The IGMP feature does not operate if the switch or VLAN does
not have an IP address configured manually or obtained through DHCP/Bootp.
To verify whether an IP address is co nfigured for th e switch or VLAN , do either
of the following:
■ Try Using the Web Browser Interface: If you can access the web
browser interface, then an IP address is configured.
■ Try To Telnet to the Switch Console: If you can Telnet to the switch,
then an IP address is configured.
■ Using the Switch Console Interface: From the Main Menu, check the
Management Address Information screen by clicking on
1. Status and Counters
2. Switch Management Address Information
Switch Mesh Problems
In a Network Using Meshed Switches, Traffic for a Specific VLAN Does
Not Reach Its Destination. The failing VLAN may not be configured on all
meshed switches. A VLAN on the network must be configured on all meshed
switches, even if a given switch has no ports assigned to that VLAN. Refer to
“VLANs and Switch Meshing” on page 6-67.
A Meshed Port Remains Disabled. The cable connecting the port to
another meshed port may be defective, or a topology error may exist. For
example, the following topology conditions are not allowed:
■ Using a hub to connect multiple meshed ports