Juniper JUNOSE SOFTWARE FOR E SERIES 11.3.X - LINK LAYER CONFIGURATION GUIDE 2010-10-13 Configuration Manual page 339

Copyright © 2010, Juniper Networks, Inc.
MLPPP bundles with only one link per bundle when configuring static
MLPPP-over-PPPoE-over-Ethernet. When you create multilink bundles in a static
MLPPP-over-PPPoE-over-Ethernet configuration, PPPoE is unable to direct the
PPPoE Active Discovery Initiation (PADI) packets received from the MLPPP bundle
links on the client to the appropriate (matching) links in the MLPPP bundle on the
server. As a result, the connections between bundle links become crossed, and the
bundle does not come up as expected. Creating MLPPP bundles with only a single
link for this configuration ensures a one-to-one correspondence between a PPPoE
subscriber and its associated link, and guarantees that the MLPPP bundle comes
up properly.
MLPPP bundles with only a single link per bundle are not required for static
MLPPP-over-PPPoE-over-Ethernet with VLAN configurations if all of the links in a
bundle have the same VLAN ID that is unique across all MLPPP bundles configured
on the line module.
On all E Series ATM module combinations that support MLPPP, you can configure:
MLPPP bundles with one or more links per bundle for dynamic MLPPP-over-multiple
PPPoE subinterfaces-over-one PPPoE major interface-over-ATM 1483 subinterface
configurations.
MLPPP bundles with only one link per bundle when configuring static
MLPPP-over-multiple PPPoE subinterfaces-over-one PPPoE major interface-over-an
ATM 1483 subinterface. In this configuration, you can stack multiple PPPoE
subinterfaces over a single PPPoE major interface.
Typically when you create ATM PVCs on an ATM module, there is a one-to-one
correspondence between a PPPoE subscriber and the ATM PVC with which the
subscriber is associated. However, in configurations with multiple PPPoE
subinterfaces stacked over a single PPPoE major interface, crossed MLPPP bundle
link connections can occur, as is the case with the ES2-S1 GE-4 IOA, and the bundle
does not come up as expected. Creating MLPPP bundles with only a single link for
this configuration ensures a one-to-one correspondence between a PPPoE subscriber
and its associated link, and guarantees that the MLPPP bundle comes up properly.
MLPPP bundles with only a single link per bundle are not required for static
MLPPP-over-multiple PPPoE subinterfaces-over-one PPPoE major
interface-over-ATM 1483 subinterface configurations if all PPPoE subinterfaces
stacked over the same PPPoE major interface belong to the same bundle.
NOTE: For information about the modules that support MLPPP on
ERX14xx models, ERX7xx models, and the ERX310 router, see ERX Module
Guide, Appendix A, Module Protocol Support. For information about the
modules that support MLPPP on the E120 and E320 routers, see E120
and E320 Module Guide, Appendix A, IOA Protocol Support.
Chapter 9: Configuring Multilink PPP
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