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Configuring Routing Instance Types Used in Layer 2 Networking

Although routing instances are primarily intended to maintain separation of tables and protocols at Layer 3 (mirroring the traditional IP network separation at Layer 3), many aspects of routing instances make them convenient to use for Layer 2 applications and architectures as well. In Layer 2 applications, routing instances still help to maintain table, interface, and customer insulation, but with regard to media access control (MAC) addresses and VLAN tags as much as IP addresses.

In summary, some routing instance types are most useful for system configurations concerning Layer 3 (IP) networking and other routing instance types are most useful for configurations concerning Layer 2 (VLAN) networking. This document describes the routing instance types that are used for Layer 2 applications. For more information about other types of routing instances, see the JUNOS Routing Protocols Configuration Guide.

Three types of routing instance can be used on an MX-series router for Layer 2 networking:

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