Networking At Layer 2: Logical Interface Types - Juniper JUNOS OS 10.4 Manual

Junos OS 12.1 MX Series 3D Universal Edge Routers Solutions Guide

Networking at Layer 2: Logical Interface Types

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Documentation
14
Networking and Internetworking with Bridges and Routers on page 6
Network Addressing at Layer 2 and Layer 3 on page 7
Networking at Layer 2: Benefits of Ethernet Frames on page 9
Networking at Layer 2: Challenges of Ethernet MAC Addresses on page 10
Networking at Layer 2: Forwarding VLAN Tagged Frames on page 11
Networking at Layer 2: Logical Interface Types on page 14
A Metro Ethernet Network with MX Series Routers on page 15
Layer 2 Networking Standards on page 17
Two main types of interfaces are used in Layer 2 configurations:
Layer 2 logical interface—This type of interface uses the VLAN-ID as a virtual circuit
identifier and the scope of the VLAN-ID is local to the interface port. This type of
interface is often used in service-provider-centric applications.
Access or trunk interface—This type of interface uses a VLAN-ID with global significance.
The access or trunk interface is implicitly associated with bridge domains based on
VLAN membership. Access or trunk interfaces are typically used in enterprise-centric
applications.
NOTE: The difference between access interfaces and trunk interfaces is
that access interfaces can be part of one VLAN only and the interface is
normally attached to an end-user device (packets are implicitly associated
with the configured VLAN). In contrast, trunk interfaces multiplex traffic
from multiple VLANs and usually interconnect switches.
Ethernet Networking
Ethernet Terms and Acronyms on page 3
Networking and Internetworking with Bridges and Routers on page 6
Network Addressing at Layer 2 and Layer 3 on page 7
Networking at Layer 2: Benefits of Ethernet Frames on page 9
Networking at Layer 2: Challenges of Ethernet MAC Addresses on page 10
Networking at Layer 2: Forwarding VLAN Tagged Frames on page 11
Networking at Layer 2: Forwarding Dual-Tagged Frames on page 13
A Metro Ethernet Network with MX Series Routers on page 15
Layer 2 Networking Standards on page 17
Copyright © 2012, Juniper Networks, Inc.