Static VLAN Subscriber Interfaces over Aggregated Ethernet Overview

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Beginning with this release of JUNOS software, you can configure static or dynamic hierarchical class of service (CoS) on a subscriber interface represented by a static virtual LAN (VLAN) stacked on a two-link aggregated Ethernet logical interface. You must configure the aggregated Ethernet logical interface on Enhanced Queuing Dense Port Concentrators (EQ DPCs) in an MX-series router. Prior to this release of JUNOS software, static VLAN subscriber interfaces were supported only over Gigabit Ethernet, Fast Ethernet, and 10-Gigabit Ethernet links that were not part of an aggregated Ethernet bundle.

A static VLAN subscriber interface over aggregated Ethernet can also support one-to-one active/backup link redundancy, depending on how you configure the underlying aggregated Ethernet interface.

To configure a static VLAN subscriber interface over aggregated Ethernet, make sure you understand the following concepts.

Guidelines for Configuring a Static VLAN Subscriber Interface over Aggregated Ethernet for Static or Dynamic CoS Support

Keep the following guidelines in mind when configuring static or dynamic CoS for a subscriber interface on a static VLAN stacked on a two-link aggregated Ethernet logical interface:

Configure the aggregated Ethernet logical interface over two physical interfaces capable of performing hierarchical scheduling, which is only supported for ports on EQ DPCs in MX-series routers.
Configure the aggregated Ethernet logical interface to operate in hierarchical scheduler mode instead of in the default per-unit scheduler mode.
Configure the aggregated Ethernet logical interface with both underlying links operating in link-protect mode.
Configure the aggregated Ethernet logical interface with the Link Aggregation Control Protocol (LACP) active.
You can apply static or dynamic CoS characteristics to a scheduler node at the aggregated Ethernet logical interface or its underlying physical interface, but not at an interface set.

Note: For this release of JUNOS software, hierarchical CoS is not supported for dynamic VLAN interfaces over aggregated Ethernet links, nor for IP demultiplexing (demux) interfaces over aggregated Ethernet links.

Guidelines for Configuring an Aggregated Ethernet Logical Interface to Support a Static VLAN Subscriber Interface

The following guidelines for configuring an aggregated Ethernet logical interface also apply to configuring a static VLAN subscriber interface stacked on a two-link aggregated Ethernet logical interface:

If you need to support one-to-one active/backup link redundancy, configure the aggregated Ethernet interface in link protection mode, which requires that the 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.

Note: One-to-one active/backup DPC redundancy is also supported with firewall filters and policy filters for static non-VLAN interfaces configured on an aggregated Ethernet logical interfaces, provided LACP is not active.