H3C MSR 5600, Руководство по настройке

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3
Basic concepts
Operating mode
The device operates in one of the following modes:
•
Standalone mode —The device cannot form an IRF fabric with other devices.
•
IRF mode —The device can form an IRF fabric with other devices.
IRF member roles
IRF uses two member roles: master and standby (called subordinate throughout the
documentation).
When devices form an IRF fabric, they elect a master to manage and control the IRF fabric, and all
the other devices back up the master. When the master device fails, the other devices automatically
elect a new master. For more information about master election, see "
Master election ."
IRF member ID
An IRF fabric uses member IDs to uniquely identify and manage its members. This member ID
information is included as the first part of interface numbers and file paths to uniquely identify
interfaces and files in an IRF fabric. Two devices cannot form an IRF fabric if they use the same
member ID. A device cannot join an IRF fabric if its member ID has been used in the fabric.
MPU roles
Each IRF member device has one or two MPUs. The following are MPU roles:
Role Description
Master MPU
Active MPU of the master device. It is also called the global active MPU. You
configure and manage the entire IRF fabric at the CLI of the global active
MPU.
Active MPU
Active MPU on each member device. An active MPU performs the following
tasks:
•
Manages the local device, including synchronizing configuration with the
local standby MPU, processing protocol packets, and creating and
maintaining route entries.
•
Processes IRF-related events, such as master election and topology
collection.
Standby MPU
For the master MPU, all other MPUs are standby MPUs, including active
MPUs on subordinate devices.
If a member device has two MPUs, the MPU backing up the local active MPU
is the local standby MPU from the perspective of the member device.
Member priority
Member priority determines the possibility of a member device to be elected the master. A member
with higher priority is more likely to be elected the master.
IRF port
An IRF port is a logical interface that connects IRF member devices. Every IRF-capable device has
two IRF ports.
In standalone mode, the IRF ports are named IRF-port 1 and IRF-port 2.
In IRF mode, the IRF ports are named IRF-port n /1 and IRF-port n /2, where n is the member ID of the
device. The two IRF ports are referred to as IRF-port 1 and IRF-port 2.