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Complete Software Guide for Junos
Understanding Nonvolatile Storage in a Virtual Chassis Configuration
Nonvolatile Memory Features
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Understanding the High-Speed Interconnection of the Virtual Chassis Members
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Documentation
Understanding Virtual Chassis Configurations and Link Aggregation
932
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OS for EX Series Ethernet Switches, Release 10.3
Configuring the Virtual Management Ethernet Interface for Global Management of a
Virtual Chassis (CLI Procedure) on page 1027
The Juniper Networks EX4200 Ethernet Switch stores Junos operating system (Junos
OS) system files in internal flash memory. In a Virtual Chassis configuration, both the
master and the backup switch store the configuration information for all the member
switches.
Nonvolatile Memory Features on page 932
The Juniper Networks Junos OS for Juniper Networks EX Series Ethernet Switches
optimizes the way the Virtual Chassis stores its configuration if a member switch or the
Virtual Chassis configuration is shut down improperly:
If the master is not available, the backup switch takes on the role of the master and
its internal flash memory takes over as the alternate location for maintaining nonvolatile
configuration memory.
If a member switch is taken offline for repair, the master stores the configuration of
the member switch.
Command Forwarding Usage with a Virtual Chassis Configuration on page 1035
Monitoring System Properties on page 658
Two high-speed Virtual Chassis ports (VCPs) on the rear panel of the Virtual Chassis
member switches enable the members to be interconnected and operate as a single,
powerful switch. Each VCP interface is 32 Gbps bidirectional. When VCP interfaces are
used to form a ring topology, each segment provides 64 Gbps bidirectional bandwidth.
Because the VCP links act as point-to-point links, multiple segments of the ring can be
used simultaneously. This allows the Virtual Chassis configuration bandwidth to scale
as you interconnect more members within the ring topology.
Understanding Virtual Chassis Components on page 924
Virtual Chassis Cabling Configuration Examples for EX4200 Switches
You can combine physical Ethernet ports belonging to different member switches of a
Virtual Chassis configuration to form a logical point-to-point link, known as a link
aggregation group (LAG) or bundle. A LAG provides more bandwidth than a single Ethernet
link can provide. Additionally, link aggregation provides network redundancy by
Copyright © 2010, Juniper Networks, Inc.
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