Storm Control On Acx Series Routers Overview - Juniper ACX1000 Configuration Manual

ACX Series Universal Access Router Configuration Guide

Storm Control on ACX Series Routers Overview

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routers correctly. As a result, TWAMP traffic and host-bound packets are dropped in
such a scenario.
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
IFD 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:
storm-control-profiles {
foo {
all {
bandwidth [percentage | level] <x>;
[no-unknown-unicast | no-broadcast | no-multicast | no-registered-multicast |
no-unregistered-multicast]
}
}
}
The second step in configuring storm control is to bind the profile to an IFD. The following
configuration shows how to bind your storm control profile:
[edit interfaces]
ge-0/0/0 {
ether-options {
ethernet-switch-profile {
storm-control foo;
}
}
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