S
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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 or starts with a numeric, you must use quotation marks
whenever referring to the VLAN name.
802.1Q links do not work correctly:
Remember that VLAN names are only locally signiÞcant through the command-line
interface. In order for two Switches to communicate across a 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 Þeld 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 may change the 802.1Q Ethertype
used by the Switch with the following command:
config dot1p ethertype <ethertype>
Changing this parameter changes how the Switch recognizes all tagged frames received,
as well as the value it inserts in all tagged frames it transmits.
VLANs, IP Addresses and default routes:
Recall that the Switch can have an IP address for each conÞgured VLAN. It is only
necessary to have an IP address associated with a VLAN if you intend to manage
(telnet, SNMP, ping) through that VLAN. You can also conÞgure multiple default routes
for the Switch. The Switch Þrst tries the default route with the lowest cost metric.
STP
You have connected an endstation directly to the Switch and the endstation fails to
boot correctly:
The Switch has STP enabled, and the endstation is booting before the STP initialization
process is complete. Specify that STP has been disabled for that VLAN, or turn off STP
for the Switch ports of the endstation and devices it is attempting to connect to, and
then reboot the endstation.
SUMMIT.BK Page 5 Thursday, September 25, 1997 12:33 PM