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 primary RE fail. Primary, 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 active

routing (NSR), and nonstop bridging (NSB) capabilities of Junos OS,

assures a smooth transfer of control plane functions following

unexpected failures.

The EX4100 implements the same slot/module/port numbering

scheme as other Juniper chassis-based products when numbering

Virtual Chassis ports, providing true chassis-like operations. By

using a consistent operating system and a single configuration file,

all switches in a Virtual Chassis configuration are treated as a single

device, greatly simplifying overall system maintenance and

management.

Individually, the EX4100 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 EX4100 with true carrier-

class reliability.

• Redundant power supplies: The EX4100 line of switches

supports redundant, load-sharing, hot-swappable, and field-

replaceable power supplies to maintain uninterrupted

operations. Thanks to its compact footprint, the EX4100

requires significantly less power than chassis-based switches

delivering equivalent port densities.

• Hot-swappable fans: The EX4100 includes hot-swappable

fans, providing sufficient cooling (for a short duration) even if

one of the fans were to fail.

• Nonstop bridging and nonstop active routing: NSB and NSR

on the EX4100 ensure that control plane protocols, states, and

tables are synchronized between primary and standby REs to

prevent protocol flaps or convergence issues following an RE

failover.

• Redundant trunk group (RTG): To avoid the complexities of

STP without sacrificing network resiliency, the EX4100

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.

• IPv4 and IPv6 routing support: IPv4 and IPv6 Layer 3 routing

(OSPF and BGP) is available with a Flex license, enabling highly

resilient networks.

MACsec AES256

The EX4100 switches support IEEE 802.1ae MACsec with

AES-256-bit encryption to increase security of point-to-point traffic

communications. MACsec provides encrypted communication at

the link layer that is capable of identifying and preventing threats

from denial of service (DoS) and other intrusion attacks, as well as

man-in-the-middle, masquerading, passive wiretapping, and

playback attacks launched from behind the firewall. When MACsec

is deployed on ports, the traffic is encrypted on the wire, but the

traffic inside the switch is not. This allows the switch to apply

network policies such as quality of service (QoS) or deep packet

inspection (DPI) to each packet without compromising the security

of packets on the wire.

PoE/PoE+/PoE++ Power, Perpetual and Fast PoE

The EX4100 delivers PoE for supporting connected devices such as

phones, surveillance cameras, IoT devices, and 802.11AX/Wi-Fi 6

access points, offering a PoE power budget of up to 1620W and

supporting up to 90W per port based on the IEEE 802.3bt PoE

standard.

EX4100 switches support perpetual PoE, which provides

uninterrupted power to connected PoE powered devices (PDs)

even when the EX4100 switch is rebooting.

The EX4100 switches also support a fast PoE capability that

delivers PoE power to connected endpoints during a switch power-

up, even before the switch is fully operational. This is especially

beneficial in situations where the endpoint only needs the power

and is not necessarily dependent on network connectivity.

Junos Telemetry Interface

The EX4100 supports Junos telemetry interface (JTI), a modern

telemetry streaming feature designed for switch health and

performance monitoring. Sensor data can be streamed to a

management system at configurable periodic intervals, enabling

network administrators to monitor individual link and node

utilization as well as troubleshoot issues such as network

congestion in real time. JTI delivers the following features:

• Performance management by provisioning sensors to collect

and stream data and analyze application and workload flow

paths through the network

• Capacity planning and optimization by proactively detecting

hotspots and monitoring latency and microbursts

• Troubleshooting and root cause analysis via high-frequency

monitoring and correlation of overlay and underlay networks

EX4100 Line of Ethernet Switches Datasheet

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