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Figure 40: Multiple DSLAMs Connected to a PPPoE Access Concentrator
B-RAS
Layer 2 switch
Layer 3 switch
Layer 2 switch
Layer 2 switch
DSLAM
DSLAM
DSLAM
VLAN ID = 1, 2, 3
Gigabit Ethernet
Fast Ethernet or
Gigabit Ethernet
ATM
ATM
VLAN ID = 1
VLAN ID = 2
ATM
VLAN ID = 3
g016523
Although in such a scenario, in which a N:1 DSLAM and PPPoE access concentrator
relationship is exhibited, normally a VLAN grouping is performed to segregate the traffic
from each DSLAM. Such a grouping of VLAN IDs is a regular network administration
practice. If such a grouping of VLAN IDs is made, a 1:1 relationship between DSLAM and
the PPPoE access concentrator is created that enables each access concentrator to
serve a VLAN group.
Configuring PPPoE for Ethernet Modules
You can configure PPPoE on Fast Ethernet (FE), Gigabit Ethernet (GE), and 10-Gigabit
Ethernet (10GE) modules. You can configure Ethernet interfaces with IP only, with PPPoE
only, with both IP and PPPoE, and with or without VLANs.
This section provides information about configuring PPPoE without VLANs. If you want
to configure PPPoE with VLANs, see “Configuring VLAN and S-VLAN Subinterfaces” on
page 167, which shows common VLAN configurations such as:
•
PPPoE over VLAN
•
IP over VLAN and PPPoE over VLAN
NOTE:
“Configuring VLAN and S-VLAN Subinterfaces” on page 167 provides other
non-VLAN configuration examples, such as configurations using MPLS.
For more information about specific Ethernet modules and the protocols and applications
they support, see:
•
ERX Module Guide
,
Appendix A
,
Module Protocol Support
(for ERX7xx models, ERX14xx
models, and ERX310 router)
Copyright © 2010, Juniper Networks, Inc.
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