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Storm Control on ACX Series Routers Overview

A traffic storm is generated when messages are broadcast on a network and each message prompts a receiving node to respond by broadcasting its own messages on the network. This, in turn, prompts further responses, creating a snowball effect. The LAN is suddenly flooded with packets, creating unnecessary traffic that leads to poor network performance or even a complete loss of network service. Storm control enables the router to monitor traffic levels and to drop broadcast, unknown unicast, and multicast (BUM) packets if they exceed the configured limit.

Storm control is applied on the following traffic types:

  • Layer 2 broadcast packets

  • Layer 2 multicast packets

  • Layer 2 unregistered multicast packets

  • Layer 2 registered multicast packets

  • Layer 2 unknown unicast packets

Storm control functions slightly differently on ACX Series routers compared to other Juniper Networks routers. On ACX Series routers, storm control is only applicable at the physical interface level. No event will be logged when a traffic storm hits an ACX Series router. Also interfaces will not be bound to any default profile. The default action is to drop the packets exceeding the configured bandwidth.

Storm control configuration is done in two steps. The first step is to create a storm control profile. Use the following configuration to create your storm control profile on an ACX Series router:

The second step in configuring storm control is to bind the profile to physical interface. The following configuration shows how to bind your storm control profile: