Juniper JUNOS OS 10.3 - SOFTWARE Manual Download

Page: 1018 / 3946

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Global Management of Member Switches in a Virtual Chassis on page 923

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High Availability Through Redundant Routing Engines on page 923

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Adaptability as an Access Switch or Distribution Switch on page 923

Basic Configuration of a Virtual Chassis with Master and Backup Switches

To take advantage of the Virtual Chassis configuration’s higher bandwidth capacity and
software redundancy features, you need to interconnect at least two EX4200 switches
in a Virtual Chassis configuration. You can start with a default configuration, composed
of two EX4200

member switches

interconnected through the dedicated 64-Gbps

Virtual

Chassis ports (VCPs)

on their rear panels. These ports do not have to be configured. They

are operational as soon as the member switches are powered on. See “Example:
Configuring a Virtual Chassis with a Master and Backup in a Single Wiring Closet” on
page 947 for additional information.

Expanding Configurations—Within a Single Wiring Closet and Across Wiring Closets

As your needs grow, you can easily expand the Virtual Chassis configuration to include
more member switches. Within a single wiring closet, simply add member switches by
cabling together the dedicated VCPs. For more information about expanding Virtual
Chassis configurations within a single wiring closet, see “Example: Expanding a Virtual
Chassis Configuration in a Single Wiring Closet” on page 952 and “Example: Setting Up a
Multimember Virtual Chassis Access Switch with a Default Configuration” on page 957.

You can also expand a Virtual Chassis configuration beyond a single wiring closet.
Interconnect switches located in multiple wiring closets or in multiple data center racks
by installing the optional SFP, SFP+, or XFP uplink modules and connecting the uplink
module ports or by connecting the 1-gigabit network interfaces in an EX4200-24F switch.
The small form-factor pluggable (SFP) uplink module provides four ports for 1-gigabit
transceivers. The SFP+ uplink module provides two ports for 10-gigabit SFP+ transceivers
or four ports for 1-gigabit SFP transceivers. The XFP uplink module provides two ports
for 10-gigabit XFP transceivers. To use SFP, SFP+, and XFP uplink module ports or
EX4200-24F network interfaces for interconnecting member switches, you must first
explicitly configure them as

Virtual Chassis ports (VCPs)

. This procedure includes

configuring these ports of a standalone EX4200 switch as VCPs prior to interconnecting
the new member switch with the existing Virtual Chassis configuration. See “Example:
Configuring a Virtual Chassis Interconnected Across Multiple Wiring Closets” on page 963
for detailed information.

When you are creating a Virtual Chassis configuration with multiple members, you might
want to deterministically control the role and member ID assigned to each member
switch. You can do this by creating a preprovisioned configuration. See “Example:
Configuring a Virtual Chassis Using a Preprovisioned Configuration File” on page 982 for
more information.

You can add switches to a preprovisioned configuration by using the autoprovisioning
feature to automatically configure the uplink module ports as VCPs on the switches
being added. See “Adding a New Switch to an Existing Virtual Chassis Configuration (CLI
Procedure)” on page 1016 for detailed information.

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