• Supported Platforms
• MX Series

• Related Topics
• Subscriber Interfaces and Demultiplexing Overview
• Configuring a Static or Dynamic IP Demux Subscriber Interface over Aggregated Ethernet
• Example: Configuring a Static Subscriber Interface on an IP Demux Interface over Aggregated Ethernet

Static or Dynamic Demux Subscriber Interfaces over Aggregated Ethernet Overview

You can configure a subscriber interface using a static or dynamic demux interface stacked on an aggregated Ethernet logical interface. Subscriber interfaces on static or dynamic demux interfaces can be used to identify specific subscribers (authenticated users) in an access network or to separate individual circuits. A subscriber interface on a static or dynamic demux interface over aggregated Ethernet can support one-to-one active/backup link redundancy or traffic load balancing, depending on how you configure the underlying aggregated Ethernet interface.

Options for Aggregated Ethernet Logical Interfaces That Support Demux Subscriber Interfaces

Traffic forwarding through a demux logical interface is dependent on the configuration of the underlying interface. Using an aggregated Ethernet interface as the underlying interface for a static or dynamic demux subscriber interface provides you with the following options:

• 1:1 Active/Backup Link Redundancy—If you need to support one-to-one active/backup link redundancy, configure the aggregated Ethernet interface in link protection mode, which requires that two underlying physical interfaces be designated as primary and backup links. In addition, if you need to support one-to-one active/backup link redundancy at the DPC level, configure the aggregated Ethernet interface on physical interfaces that reside on different EQ DPCs. Link protection is required when configuring hierarchical CoS on the subscriber interface.
• Load Balancing—If you need to support traffic load balancing instead of redundancy, configure the aggregated Ethernet interface to operate in Link Aggregation Control Protocol (LACP) active mode. When using LACP link protection, you can configure only two member links to an aggregated Ethernet interface: one active and one standby. The Junos implementation of the IEEE 802.3ad standard balances traffic across the member links within an aggregated Ethernet bundle based on the Layer 3 information carried in the packet.

For more information about aggregated Ethernet interfaces, see the Junos Network Interfaces Configuration Guide.

Features Supported with Static or Dynamic Demux Subscriber Interfaces over Aggregated Ethernet

Table 1 lists key subscriber access features supported with static or dynamic demux subscriber interfaces, organized by type of underlying interface:

• Aggregated Ethernet
• Non-aggregated Ethernet (Gigabit Ethernet, Fast Ethernet, or 10-Gigabit Ethernet)

There are no feature limitations specific to demultiplexing. Instead, demux interfaces over aggregated Ethernet are subject to the same scaling and configuration limitations inherent to aggregated Ethernet logical interfaces.