• 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
Networking at Layer 2: Logical Interface Types
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.
Related
Documentation
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.14
Junos OS 12.1 MX Series 3D Universal Edge Routers Solutions Guide
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