Extreme Networks ExtremeWare XOS 10.1, Manual

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Using the Command Line Interface
ExtremeWare XOS 10.1 Concepts Guide 239
you already have a VLAN using untagged traffic on a port. Only one VLAN using untagged traffic can
be configured on a single physical port.
VLAN configuration can be verified by using the following command:
show vlan {<vlan_name> | stpd}
The solution for this error is to remove ports 1 and 2 from the VLAN currently using untagged traffic
on those ports. If this were the “default” VLAN, the command would be:
localhost:23 # configure vlan default del port 1:1,1:2
Which should now allow you to re-enter the previous command without error as follows:
localhost:26 # configure vlan red add port 1:1,1:2
VLAN names:
There are restrictions on VLAN names. They cannot contain whitespaces and cannot start with a
numeric value unless you use quotation marks around the name. If a name contains whitespaces, starts
with a number, or contains non-alphabetical characters, 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 significant through the command-line interface. 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 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
may change the 802.1Q Ethertype used by the switch with the following command:
configure dot1q ethertype <value>
Changing this parameter changes how the system recognizes all tagged frames received, 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
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 to which it is attempting to connect, and then reboot the endstation.