Understanding Unknown Unicast Forwarding On Ex Series Switches - Juniper JUNOS OS 10.4 - FOR EX REV 1 Manual

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Understanding Unknown Unicast Forwarding on EX Series Switches

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3014
®
OS for EX Series Ethernet Switches, Release 10.4
NOTE: When you configure storm control bandwidth on an aggregated
Ethernet interface, the storm control level for each member of the aggregated
Ethernet interface is set to that bandwidth. For example, if you configure a
storm control bandwidth of 15,000 Kbps on
ge-0/0/0 and ge-0/0/1
Kbps. Thus, the storm control level on
Kbps of combined broadcast, multicast, and unknown unicast traffic.
Example: Configuring Storm Control to Prevent Network Outages on EX Series Switches
on page 3015
Configuring Autorecovery From the Disabled State on Secure or Storm Control Interfaces
(CLI Procedure) on page 3018
Unknown unicast traffic consists of unicast packets with unknown destination MAC
addresses. By default, the switch floods these unicast packets that are traveling in a
VLAN to all interfaces that are members of the VLAN. Forwarding this type of traffic to
interfaces on the switch can trigger a security issue. The LAN is suddenly flooded with
packets, creating unnecessary traffic that leads to poor network performance or even a
complete loss of network service. This is known as a traffic storm.
To prevent a storm, you can disable the flooding of unknown unicast packets to all
interfaces by configuring one VLAN or all VLANs to forward all unknown unicast traffic
to a specific trunk interface. This channels the unknown unicast traffic to a single interface.
Understanding Storm Control on EX Series Switches on page 3013
Example: Configuring Storm Control to Prevent Network Outages on EX Series Switches
on page 3015
Configuring Unknown Unicast Forwarding (CLI Procedure) on page 3017
, and
ae1
, each member has a storm control level of 15,000
allows a traffic rate of up to 30,000
ae1
Copyright © 2010, Juniper Networks, Inc.
has two members,
ae1