Technical Documentation

Configuring Aggregated Ethernet Link Protection

You can configure link protection for aggregated Ethernet interfaces to provide QoS on the links during operation.

On aggregated Ethernet interfaces, you designate a primary and backup link to support link protection. Egress traffic passes only through the designated primary link. This includes transit traffic and locally generated traffic on the router. When the primary link fails, traffic is routed through the backup link. Because some traffic loss is unavoidable, egress traffic is not automatically routed back to the primary link when the primary link is reestablished. Instead, you manually control when traffic should be diverted back to the primary link from the designated backup link.

Configuring Link Protection for Aggregated Ethernet Interfaces

Aggregated Ethernet interfaces support link protection to ensure QoS on the interface.

To configure link protection:

  1. Specify that you want to configure the options for an aggregated Ethernet interface.
  2. Configure the link protection mode.
    [edit interfaces aex aggregated-ether-options]user@host#set link-protection

Configuring Primary and Backup Links for Link Aggregated Ethernet Interfaces

To configure link protection, you must specify a primary and a secondary, or backup, link.

To configure a primary link and a backup link:

  1. Configure the primary logical interface.

    [edit interfaces interface-name]user@host# set (fastether-options | gigether-options) 802.3ad aex primary
  2. Configure the backup logical interface.

    [edit interfaces interface-name]user@host# set (fastether-options | gigether-options) 802.3ad aex backup

Reverting Traffic to a Primary Link When Traffic is Passing Through a Backup Link

On aggregated Ethernet interfaces, you designate a primary and backup link to support link protection. Egress traffic passes only through the designated primary link. This includes transit traffic and locally generated traffic on the router. When the primary link fails, traffic is routed through the backup link. Because some traffic loss is unavoidable, egress traffic is not automatically routed back to the primary link when the primary link is reestablished. Instead, you manually control when traffic should be diverted back to the primary link from the designated backup link.

To manually control when traffic should be diverted back to the primary link from the designated backup link:

user@host# request interface revert aex

Disabling Link Protection for Aggregated Ethernet Interfaces

To disable link protection, issue the request interface revert aex operational command.

user@host# delete interfaces aex aggregated-ether-options link-protection

Published: 2010-04-20