3Com 4210G Series, Configuration Manual, Page: 1097 / 1133

26-2
Figure 27-1
IRF networking
IP network
IRF
IP network
IRF cable IRF cable
Equals
Master Slave Slave
IRF has the following advantages:
z
Simple management
After an IRF is formed, you can log in to the IRF system by connecting to a port of any IRF member.
When you log in to the IRF, actually you log in to the master device of the IRF. You can manage all IRF
members by configuring the master, for example, allocating IP addresses to the members,
interconnecting the members, and running routing protocols.
z
Powerful network expansion capability
By adding member devices, you can increase the number of IRF ports, expand network bandwidth,
and improve processing capability of the IRF system.
z
High reliability
Not only the physical IRF ports of members can be aggregated, but also the physical links between the
IRF system and the upper or lower layer devices can be aggregated, and thus the reliability of the IRF
system is increased through the link backup.
The IRF system comprises multiple member devices: the master runs, manages and maintains the IRF,
whereas the slaves process services as well as functioning as the backups. When the master fails, the
IRF system elects a new master immediately to prevent service interruption and implement 1:N
backup.
IRF Working Process
The life cycle of an IRF involves four stages: IRF Connections , Topology Collection , Role Election , and
IRF Management .
IRF Connections
Pysical IRF port
To make an IRF operate normally, you need to connect the IRF members physically. Physical ports
that are dedicated to IRF connection on devices are called physical IRF ports. For the Switch 4210G
series, the 10 GE interface modules can be inserted into the expansion module slots on the rear panel