Understanding Ex4200 Virtual Chassis Configuration - Juniper JUNOS OS 10.4 - FOR EX REV 1 Manual

Complete Software Guide for Junos

Understanding EX4200 Virtual Chassis Configuration

904
®
OS for EX Series Ethernet Switches, Release 10.4
You configure and manage almost all aspects of an EX4200 Virtual Chassis configuration
through the master of the Virtual Chassis. However, you can also configure Virtual Chassis
parameters when a Juniper Networks EX4200 Ethernet Switch is a standalone switch
not interconnected with other members.
An EX4200 switch has some innate characteristics of a Virtual Chassis by default. A
standalone EX4200 switch is assigned member ID
you can edit its Virtual Chassis configuration. When the standalone switch is
interconnected with an existing Virtual Chassis configuration, the Virtual Chassis
configuration statements and any uplink Virtual Chassis port (VCP) settings that you
previously specified on the standalone switch remain part of its configuration.
A switch is not recognized as a member of a Virtual Chassis until it is interconnected with
the master or interconnected with an existing member of the Virtual Chassis. When a
switch is located too far away to be interconnected through dedicated VCPs, you can
specify an uplink module port or an EX4200-24F network interface as a VCP by using
the
request virtual-chassis vc-port
command on the switch you are adding to the Virtual Chassis as well as on the
vc-port
existing member switch that you will connect to the new member. Because the
to-be-added switch is not yet a member, the master switch will not recognize that added
switch unless the latter has an uplink VCP. A link aggregation group (LAG) will be formed
automatically when the new switch is added to the configuration if more than one such
link with the same speed is detected between uplink VCPs on the new member and an
existing member. See "Understanding EX4200 Virtual Chassis Link Aggregation" on
page 902.
When an uplink module port or an EX4200-24F network interface is set as a VCP, it
cannot be used for any additional purpose. If you want to use the uplink module port or
EX4200-24F network interface for another purpose, you can delete the VCP setting by
using the request virtual-chassis vc-port
directly on the member whose uplink VCP setting you want to delete or through the
master of the Virtual Chassis configuration.
CAUTION: Deleting a VCP in a Virtual Chassis chain configuration can cause
the Virtual Chassis configuration to split. For more information, see
"Understanding Split and Merge in an EX4200 Virtual Chassis" on page 912.
You can create a preprovisioned configuration. This type of configuration allows you to
deterministically control the member ID and role assigned to a member switch by
associating the switch with its serial number. For an example of a preprovisioned
configuration, see "Example: Configuring an EX4200 Virtual Chassis Using a Preprovisioned
Configuration File" on page 952.
0 and is the master of itself. Therefore,
command. You must issue the
command. You can execute this command
Copyright © 2010, Juniper Networks, Inc.
request virtual-chassis