Enabling link-aggregation traffic redirection
Link-aggregation traffic redirection prevents traffic interruption.
When you restart a card that contains Selected ports in a multimodule dynamic aggregation, this feature redirects the traffic on the ports to the remaining cards. Zero packet loss is guaranteed for known unicast traffic, but not for unknown unicast traffic. (In standalone mode.)
When you restart an IRF member device that contains Selected ports in a multichassis dynamic aggregation, this feature redirects the traffic on the ports to the remaining IRF member devices. When you restart a card that contains Selected ports in a multimodule dynamic aggregation, this feature redirects the traffic on the ports to the remaining cards. Zero packet loss is guaranteed for known unicast traffic, but not for unknown unicast traffic. (In IRF mode.)
Configuration restrictions and guidelines
When you enable link-aggregation traffic redirection, follow these restrictions and guidelines:
Link-aggregation traffic redirection applies only to dynamic link aggregation groups.
To prevent traffic interruption, enable link-aggregation traffic redirection on devices at both ends of the aggregate link.
To prevent packet loss that might occur when a module or the device reboots, do not enable spanning tree together with link-aggregation traffic redirection.
Link-aggregation traffic redirection cannot operate correctly on an edge aggregate interface.