Allied Telesis AT-8550 - Manual (Page 251)

AT-9108, AT-8518, AT-8525, and AT-8550 User’s Guide
B-7
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 with the following command:
config dot1p ethertype
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
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 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.
The switch keeps aging out endstation entries in the switch
Forwarding Database (FDB):
Reduce the number of topology changes by disabling STP on those
systems that do not use redundant paths.
Specify that the endstation entries are static or permanent.