malfunction. If a switch is merely mis−configured, traffic still passes through. Thus, the client receives a DHCP address, and switches located downstream of the suspected switch are reachable by support personnel.
Resolution Determine the most likely location of the failure with utilities such as ping and Telnet as well as the network diagram. Use this procedure:
1.Determine which switches do not respond to the ping utility.
2.Telnet into a visible switch, if available, and try to ping the non−responsive switches again.
3.If the property has an IT staff willing to help:
a.Have the IT staff check the unresponsive switch(es) in order to ensure that all power and Ethernet cables are plugged snuggly into their respective sockets.
b.Ensure all applicable link lights on the switch are lit and note lights that are not lit.
A link light that must be lit, but is not, can indicate the presence of the wrong type of cable.
c.Unplug the power cable in order to power cycle the switch. Wait five to ten seconds, and plug the power cable back into the switch.
d.Unplug the uplink cable from the suspected switch. Plug this uplink cable into a laptop configured for DHCP and try to get an IP address.
If you cannot get an IP address, the problem is most likely upstream. If you can get an IP address, the problem is most likely downstream.
e.Configure the laptop with the IP address of the BBSM internal NIC and plug it into the uplink port of the suspected switch. Try to ping the switch.