Understanding Nonvolatile Storage In A Virtual Chassis Configuration - Dell PowerConnect J-EX4200-24T Software Manual

Dell PowerConnect J-Series Ethernet Switch Complete Software Guide for Junos OS

Understanding Nonvolatile Storage in a Virtual Chassis Configuration

Nonvolatile Memory Features
Related
Documentation
Understanding the High-Speed Interconnection of the Virtual Chassis Members
Related
Documentation
Understanding Virtual Chassis Configurations and Link Aggregation
702
Configuring the Virtual Management Ethernet Interface for Global Management of a
Virtual Chassis (CLI Procedure) on page 797
The J-EX4200 Ethernet Switch stores 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 702
The Junos OS for J-EX Series 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 803
Monitoring System Properties on page 550
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 694
Virtual Chassis Cabling Configuration Examples for J-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