Extreme Networks Summit1 manual Stp

USING THE COMMAND-LINE INTERFACE

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 numeric, 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:

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 configured 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 configure multiple default routes for the switch. The switch 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 it is attempting to connect to, and then reboot the endstation.

SUMMIT SWITCH INSTALLATION AND USER GUIDE C-5