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Appendix B Troubleshooting
445
VLAN Names
There are restrictions on VLAN names. They cannot contain white
spaces and cannot start with a numeric value unless you use quotation
marks around the name.
If a name contains
white spaces, starts
with a number, or
contains non-
alphabetical characters,
you must use quotation
marks whenever
referring to the VLAN
name.
What if 802.1Q links do not work correctly?
• VLAN names are only locally significant through the command-
line interface. For two switches to communicate across an 802.1Q
link, the VLAN ID for the VLAN on one switch should have a
corresponding VLAN ID for the VLAN on the other switch.
• If you are connecting to a third-party device and have checked that
the VLAN IDs are the same, the Ethertype field used to identify
packets as 802.1Q packets may differ between the devices. The
default value used by the switch is
8100. If the third-party device
differs from this and cannot be changed, you can change the 802.1Q
Ethertype used by the switch with this command:
configure dot1p ethertype <ethertype>
Changing this parameter changes how the system recognizes all
tagged frames it receives, as well as the value it inserts in all
tagged frames it transmits.
VLANs, IP Addresses and Default Routes
The system can have an IP address for each configured VLAN. It is
necessary to have an IP address associated with a VLAN if you intend
to manage (Telnet, SNMP, ping) through that VLAN or route IP
traffic.
You can also configure multiple default routes for the system. The
system first tries the default route with the lowest cost metric.
STP
I have connected an endstation directly to the switch, but the
endstation fails to boot correctly. Why?
• The switch has STP enabled, and the endstation is booting before
the STP initialization process is complete.
• Verify that STP has been disabled for that VLAN, or turn off STP
for the switch ports of the endstation (and devices to which it is
attempting to connect). Then reboot the endstation.