How the Juniper MX204 Powers Multi-Cloud Networking

Juniper's MX204 router overview describes the MX204 as an Ethernet-optimized edge router with 400 Gbps of capacity, and names three jobs for it: high-speed transport and VPN services, broadband multiplay services, and data center internetworking. This page is about that third job and the VPN side of the first. It covers what the hardware offers a site that links data centers or hands traffic to a cloud provider's edge, and where the box stops. The MX204 range is on the shelf, and one of the listings is the MX204-R.

The ports for linking sites

The MX204 has four rate-selectable ports and eight 10GbE ports, all on the front of a one-rack-unit chassis. Each of the four rate-selectable ports takes a QSFP28 or QSFP+ transceiver and can be set to 100GbE, to 40GbE, or to four 10GbE ports with a breakout cable. The eight fixed ports take SFP+ transceivers at 10GbE. In practice that gives four 100GbE links to other sites, with 10GbE ports left for the local side, or any mix in between.

Juniper puts the system capacity at 400 Gbps, which equals four 100GbE ports at full rate. It also states that the MX204 does this in a single rack unit while consuming 0.9 W per Gb, and the MX204 hardware guide gives 240 W typical and 280 W maximum for a fully loaded router.

VPN and Layer 2 and Layer 3 services

The router runs Junos OS on Juniper's Trio chipset, which Juniper describes as giving increased scalability for Layer 2 and Layer 3 packet forwarding, buffering and queuing. The same overview lists the services the platform is sold for: virtual private network services and Ethernet switching with carrier-class routing. A site-to-site link that carries several customers or business units on separate VPNs is the pattern Juniper has in mind.

Other features Juniper names in the overview:

• Programmable chipset. Fast microcode changes in the hardware and a programmable QoS engine with coarse and fine-grained queuing.
• Application-aware networking. Deep packet inspection to detect applications, with user-defined policies for how each is treated.
• Junos telemetry interface. Streaming of component-level data for monitoring congestion, resource use, traffic volume and buffer occupancy.
• Hardware-based timing. Synchronous Ethernet and Precision Time Protocol, so no external clock is needed.

What the MX204 does not do

It is a fixed router with one built-in Routing Engine. It has no line-card slots and no way to add ports. Its two power supplies run 1+1 and its three fan modules are redundant, but the Routing Engine is not, so a site that cannot tolerate a Routing Engine failure runs two MX204s as a pair or moves up a size. For 400GbE ports or capacity beyond 400 Gbps, the next router is the MX304; the MX204 vs MX304 guide sets the two side by side.

Practical details for the rack

• 1.72 in high, 19 in wide and 18.5 in deep, 22.7 lb fully loaded.
• Two power supplies of 650 W, in AC (100 to 240 V) or DC (-40 to -72 V) versions.
• Three fan modules with front-to-back airflow.
• Operating temperature 0 to 40 C, and -5 to 55 C for short periods, at altitudes up to 10,000 ft with no performance loss.

Lifecycle

Juniper announced end of life for the current MX204 part number, the MX204-HW-BASE, on June 15, 2026. Its last order date is June 15, 2027 and its end of support is June 30, 2032. The older MX204-IR and MX204-R bundles reached end of sale on September 30, 2021, and their support runs to June 15, 2032. The dates and the notice numbers are in Juniper MX204 end of life.

Every MX204 Townsend ships is tested first. If the variant you need is not listed, send the requirement through a quote request.