1-6
z Establishing an XRN system requires a high consistency of the configuration of each device.
Hence, before you enable the fabric port, do not perform any configuration for the port, and do not
configure some functions that affect the XRN for other ports or globally. Otherwise, you cannot
enable the fabric port. For detailed restrictions refer to the error information output by devices.
z When you have enabled fabric port function for a fabric port group, if you need to change the fabric
port group, you must disable the fabric function of the current fabric port group before you configure
another group. Otherwise, the system will prompt that the current fabric port group is in use, you
cannot change the fabric port group.
z As shutting down a fabric port directly may cause the fabric to be split and error messages, do not
perform such operations.
z To split a fabric, you can simply remove the cables used to form the fabric or disable the fabric
using the undo fabric-port enable command.
z You can shut down/bring up a port after you disable the fabric feature on the port.
z If you need to configure an XRN fabric as a DHCP relay or DHCP client, configure the UDP Helper
function in the fabric at the same time to ensure that the client can successfully obtain an IP
address. (Since this configuration can be automatically synchronized to the entire fabric, you can
perform it on only one unit.) For the configuration of the UDP Helper function, refer to the UDP
Helper part in this manual.
z After you use the port link-type xrn-fabric command to specify a port as the fabric port, you
cannot use the port link-type command to change the port to a port of other types. You must use
the undo fabric-port command first to disable the fabric port function of the port to change the port
type.
Specifying the VLAN Used to Form an XRN Fabric
When the devices in an XRN fabric are transmitting XRN data, to avoid it being sent to other non fabric
ports, the data should be transmitted in a specified VLAN. You can specify the VLAN used to transmit
XRN data.
Follow these steps to specify the VLAN used to form an XRN fabric:
To do… Use the command… Remarks
Enter system view system-view —
Specify the VLAN used to form
an XRN fabric ftm fabric-vlan vlan-id
Required
By default, the VLAN used to
form the XRN fabric is VLAN
4093
You cannot specify an existing VLAN to form an XRN fabric; otherwise, your configuration fails.