3Com 5500-EI PWR Reference Manual page 856

Parameters
interface-type interface-number: Type and port number of a fabric port.
On a Switch 5500-EI 28 port switch, only four GigabitEthernet ports can be configured as fabric
ports: GigabitEthernet 1/0/25, GigabitEthernet 1/0/26, GigabitEthernet 1/0/27, and GigabitEthernet
1/0/28.
On a Switch 5500-EI 52 port switch, only four GigabitEthernet ports can be configured as fabric
ports: GigabitEthernet 1/0/49, GigabitEthernet 1/0/50, GigabitEthernet 1/0/51, and GigabitEthernet
1/0/52.
Description
Use the fabric-port enable command to configure a specified port as a fabric port.
Use the undo fabric-port enable command to disable the fabric port function for a port. When the last
fabric port on a switch is disabled, the fabric function is disabled globally.
The four ports on a Switch 5500-EI 28 port(Switch 5500-EI 52 port) switch fall into two groups
according to their port numbers:
GigabitEthernet 1/0/25(49) and GigabitEthernet 1/0/26(50) form the first group.
GigabitEthernet 1/0/27(51) and GigabitEthernet 1/0/28(52) form the second group.
Only one group of ports can be configured as fabric ports at a time. Given a group, either
GigabitEthernet 1/0/25(49) or GigabitEthernet 1/0/27(51) can be configured as the left fabric port, and
either GigabitEthernet 1/0/26(50) or GigabitEthernet 1/0/28(52) can be configured as the right fabric
port.
Establishing an XRN system requires a high consistency of the configuration of each device.
Hence, before you bring up the fabric port, do not perform any configuration for the port, and do not
enable some functions that affect the XRN for other ports or globally. Otherwise, you cannot bring
up the fabric port. For detailed restrictions, refer to the error information output by devices.
When you have brought up 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
execute the enable command on another group. Otherwise, the system will prompt that the current
fabric port group is in use, you cannot change the fabric port group.
Examples
# Set GigabitEthernet 1/0/25 port as a fabric port.
<Sysname> system-view
System View: return to User View with Ctrl+Z.
[Sysname] fabric-port GigabitEthernet1/0/25 enable
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