If many orange lights appear on the switch, do not panic. It may be
that all the ports belong to the same VLAN, which was accidentally deleted. When you
add the VLAN back into the VLAN table, the ports become active again. A port
remembers its assigned VLAN.
80 Chapter 2: Medium-Sized Switched Network Construction
?– Autonegotiation is enabled: Autonegotiation is an optional function of the
FastEthernet (IEEE 802.3u) standard that enables devices to automatically exchange
information about speed and duplex abilities over a link. You should not use
autonegotiation for ports that support network infrastructure devices, such as switches,
routers, or other nontransient end systems, such as servers and printers.
Autonegotiating speed and duplex settings is the typical default behavior on switch
ports that have this capability. However, you should always con?¬?gure ports that
connect to ?¬?xed devices for the correct speed and duplex setting, rather than allow
them to autonegotiate these settings. This con?¬?guration eliminates any potential
negotiation issues and ensures that you always know exactly how the ports should be
operating.
Troubleshooting VLANs and Trunking
To effectively troubleshoot switches, you must know how to identify and resolve VLAN
performance issues, assuming you have identi?¬?ed and resolved any port connectivity and
autonegotiation issues.
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