Spec Sheet
4
Data SheetEX4300 Ethernet Switch
Junos Fusion Enterprise
Junos Fusion Enterprise technology enables a large number
of devices deployed throughout a building to be managed as
a single, logical device. A future software release will enable
EX4300 fixed configuration Ethernet switches to support Junos
Fusion Enterprise technology, functioning as Satellite devices
(see Figure 6).
Figure 6: EX4300 switches as Satellite devices in a Junos Fusion
Enterprise architecture.
Features and Benefits
Chassis-Class Availability
The EX4300 line of Ethernet switches delivers high availability
through redundant power supplies and fans, GRES, and non-
stop bridging and routing when deployed in a Virtual Chassis
configuration.
In a Virtual Chassis configuration, each EX4300 switch is
capable of functioning as a Routing Engine. When two or more
EX4300 switches are interconnected, a single control plane is
shared among all Virtual Chassis member switches. When two
EX4300 switches are interconnected, Junos OS automatically
initiates an election process to assign a master (active) and
backup (hot-standby) Routing Engine. An integrated Layer 2
and Layer 3 GRES feature maintains uninterrupted access to
applications, services, and IP communications in the unlikely
event of a primary RE failure.
When more than two switches are interconnected in a Virtual
Chassis configuration, the remaining switch elements act as
line cards and are available to assume the backup RE position
should the designated master fail. Master, backup, and line card
priority status can be assigned to dictate the order of ascension;
this N+1 RE redundancy, coupled with the GRES, nonstop routing
(NSR) and nonstop bridging (NSB) capabilities of the Junos OS,
assures a smooth transfer of control plane functions following
unexpected failures.
The EX4300 implements the same slot/module/port numbering
schema as other Juniper Networks chassis-based products
when numbering Virtual Chassis ports, providing true chassis-
like operations. By utilizing a consistent operating system and
a single configuration file, all switches in a Virtual Chassis
configuration are treated as a single device, simplifying overall
system maintenance and management.
Individually, the EX4300 offers a number of HA features that are
typically associated with modular chassis-based switches. When
combined with the field-proven Junos OS and L2/L3 failover
capabilities, these features provide the EX4300 with true carrier-
class reliability.
• Redundant power supplies: The EX4300 line of Ethernet
switches supports internal redundant, load-sharing, hot-
swappable, and field-replaceable AC and DC power supplies
to maintain uninterrupted operations. Thanks to its compact
footprint, the EX4300 requires significantly less power than
chassis-based switches delivering equivalent port densities.
• Hot-swappable fans: The EX4300 includes hot-swappable
fans, providing sucient cooling even if one of the fans were
to fail.
• Non-Stop Bridging (NSB) and Non-Stop Routing (NSR):
NSB and NSR on the EX4300 ensure control plane protocols,
states and tables are synchronized between Master and
Standby REs to prevent protocol flaps or convergence issues
following a Routing Engine failover.
• Redundant trunk group (RTG): To avoid the complexities
of Spanning Tree Protocol (STP) without sacrificing network
resiliency, the EX4300 employs redundant trunk groups to
provide the necessary port redundancy and simplify switch
configuration.
• Cross-member link aggregation: Cross-member link
aggregation allows redundant link aggregation connections
between devices in a single Virtual Chassis configuration,
providing an additional level of reliability and availability.
• Carrier-class hardware: The EX4300 leverages a purpose-
built packet forwarding engine ASIC, the EX-PFE, which
integrates much of the same intellectual property used
in Juniper Networks carrier-class routers. As a result, the
EX4300 delivers the same predictable, scalable functionality
found in the world’s largest networks.
• IPv4 and IPv6 routing support: IPv4 and IPv6 Layer 3 routing
(OSPF and BGP) is available with an Enhanced license,
enabling highly resilient networks.
Floor 0 Closet Closet
EX4300 Satellite Devices
Aggregation Devices
Junos
Fusion
Enterprise
EX9200
IDF
Floor n Closet Closet