Bridged Ethernet Application; Assigning Mac Addresses; Vlan And S-Vlan Configurations; Figure 43: Bridged Ethernet Topology, Router Terminating And Routing - Juniper JUNOSE SOFTWARE 11.2.X - LINK LAYER CONFIGURATION GUIDE 7-7-2010 Configuration Manual

JunosE 11.2.x Link Layer Configuration Guide

Bridged Ethernet Application

Figure 43: Bridged Ethernet Topology, Router Terminating and Routing Traffic

Assigning MAC Addresses

VLAN and S-VLAN Configurations

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Figure 43 on page 444 shows an example of a client computer using IP/PPP/PPPoE and
an Internet gaming system running IP, connecting to the E Series router over the same
ATM PVC. The client computer and gaming system can connect to an E Series router via
an xDSL modem over a single ATM PVC, and the router can forward these two data
streams independently. When the router receives the two data streams, it uses the
Ethertype contained in the bridged Ethernet header to select which upper interface (IP
or PPPoE) receives the frame.
In Figure 43 on page 444, IP and PPPoE interfaces are configured so that the non-PPPoE
IP traffic is received by the IP interface, and the IP/PPP/PPPoE traffic is received by the
PPPoE interface. Since the router receives these data streams on different IP interfaces,
they may be routed independently.
When you create a bridged Ethernet interface, the system media access control (MAC)
address is assigned to the interface by default. However, you can assign a specific MAC
address to each statically configured bridged Ethernet interface. For example, if multiple
statically configured bridged Ethernet interfaces are connected to the same device, using
specific MAC addresses enables the connected device to select the correct ATM port or
VC to use.
You configure a specific MAC address when you create the bridged Ethernet interface.
If you want to modify an existing MAC address, you must remove the interface and create
it again. Also, you cannot configure multicast MAC addresses on bridged Ethernet
interfaces.
Bridged Ethernet interfaces on E Series routers support the configuration of virtual local
area networks (VLANs) and stacked virtual local area networks (S-VLANs). A VLAN
permits multiplexing multiple higher-level protocols over a single physical port. An S-VLAN
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