Member Switch And Member Id - Juniper EX9200 Features Manual

Member Switch and Member ID

Copyright © 2017, Juniper Networks, Inc.
Runs only a subset of Junos OS for EX Series switches.
Does not run the chassis control protocols.
Can detect certain error conditions (such as an unplugged cable) on any interfaces
that have been configured on it through the master.
The Virtual Chassis configuration must have at least three members in order to include
a linecard member.
In a preprovisioned configuration, you can explicitly configure a member with the
linecard role, which makes it ineligible for functioning as a master or backup.
In a configuration that is not preprovisioned, the members that are not selected as
master or backup function as linecard members of the Virtual Chassis configuration.
The selection of the master and backup is determined by the mastership priority value
and secondary factors in the master election algorithm. A switch with a mastership
priority of 0 is always in the linecard role.
Each standalone EX Series switch that supports Virtual Chassis is a potential member
of a Virtual Chassis configuration. When one of those switches is powered on, it receives
a member ID that can be seen by viewing the front-panel LCD or by entering the
command. If the switch is powered on as a standalone switch, that
virtual-chassis
member's member ID is always
in a Virtual Chassis configuration, its member ID is assigned by the master based on
various factors, such as the order in which the switch was added to the Virtual Chassis
configuration or the member ID assigned by a preprovisioned configuration. See
Understanding How the Master in a Virtual Chassis Is Elected.
If the Virtual Chassis configuration previously included a member switch and that member
was physically disconnected or removed from the Virtual Chassis configuration, its
member ID is not available for assignment as part of the standard sequential assignment
by the master. For example, you might have a Virtual Chassis configuration composed
of member 0, member 2, and member 3, because member 1 was removed. When you
add another member switch and power it on, the master assigns it as member 4.
The member ID distinguishes the member switches from one another. You use the member
ID:
To assign a mastership priority value to a member switch
To configure interfaces for a member switch (The function is similar to that of a slot
number on Juniper Networks routers.)
To apply some operational commands to a member switch
To display status or characteristics of a member switch
. When the switch is interconnected with other switches
0
Chapter 1: Virtual Chassis Overview
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