Juniper MX2020 Hardware Manual page 31

Ethernet aggregation at the campus/enterprise edge—Supports dense 1-Gigabit Ethernet, 10-Gigabit
Ethernet, and 100-Gigabit Ethernet configurations, and provides full Layer 3 support for campus edge
requirements
Ethernet aggregation at the multiservice edge—Supports up to 480 1-Gigabit Ethernet ports or
48 10-Gigabit Ethernet ports for maximum Ethernet density along, with full Layer 2 and Layer 3 VPN
support for MSE applications
NOTE: You can configure MX Series routers to provide simultaneous support for Layer 2 and
Layer 3 Ethernet services. In many cases, Layer 2 protocols run on some interfaces, and Layer 3
protocols run on others.
The Junos OS Layer 2 Switching and Bridging Library topic discusses Layer 2 configurations on
supported routers, including Layer 2 statement summaries and configuration statement examples.
For more complete Layer 2 configuration examples for MX Series routers, see the Ethernet
Networking Feature Guide for MX Series Routers.
For more information about configuring Layer 3 features and functions (such as class of service),
see the relevant Junos configuration guides.
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