3Com 4210G Series Configuration Manual page 1098

of the switch to provide physical IRF ports. The following 10 GE interface modules can be used to
provide physical IRF ports:
One-port 10 GE XFP interface module
Dual-port 10 GE XFP interface module
Short-haul dual-port 10 GE CX4 interface module
Dual-port 10 GE SFP+ interface module
For the details of the interface modules, refer to the user manual.
You can connect physical IRF ports of the Switch 4210G series with either the CX4 dedicated cables
or fibers according to the interface type on the interface module. Dedicated cables provide higher
reliability and performance; whereas fibers connect physical devices located very far from each other
and provide flexible application.
The physical IRF ports are numbered according to their physical locations on the rear panel of the
Switch 4210G series. With the rear panel facing you, the physical IRF ports are numbered
successively from left to right: ports on the interface module in slot 1 are numbered 1 and 2, and ports
on the interface module in slot 2 are numbered 3 and 4, as shown in
example of inserting a CX4 dual-port interface module.
Figure 27-2 Numbering physical IRF ports
If you insert a one-port interface module into the slot, then the number of the physical IRF port
corresponding to the module in slot 1 is 1, and the number of the physical IRF port corresponding to
the module in slot 2 is 3. For the number of physical IRF ports, see
Physical IRF ports can be used for both IRF connection and service data transmission. When
establishing an IRF, you need to specify that the physical IRF ports are used for the IRF, that is, bind
them with IRF port(s) to implement IRF connection and establishment.
IRF port
You can set a physical IRF port as an IRF port, which is used to transfer data and protocol packets
among IRF members. An Switch 4210G series can be configured with two IRF ports, which are
numbered 1 and 2, to connect other devices in an IRF.
Configuring IRF
26-3
Figure 27-2, which illustrates an
Ports.