Understanding Unknown Unicast Forwarding On J-Ex Series Switches - Dell PowerConnect J-EX4200-24T Software Manual

Dell PowerConnect J-Series Ethernet Switch Complete Software Guide for Junos OS
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Understanding Unknown Unicast Forwarding on J-EX Series Switches

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2512
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 15000 Kbps on
and
ge-0/0/0 ge-0/0/1
Kbps. Thus, the storm control level on
Kbps of combined broadcast and unknown unicast traffic.
Example: Configuring Storm Control to Prevent Network Outages on J-EX Series
Switches on page 2513
Configuring Autorecovery From the Disabled State on Secure or Storm Control Interfaces
(CLI Procedure) on page 2516
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 and unknown unicast traffic
to a specific trunk interface. This channels the unknown unicast traffic to a single interface.
Understanding Storm Control on J-EX Series Switches on page 2511
Example: Configuring Storm Control to Prevent Network Outages on J-EX Series
Switches on page 2513
Configuring Unknown Unicast Forwarding (CLI Procedure) on page 2515
, and
ae1
, each member has a storm control level of 15000
allows a traffic rate of up to 30000
ae1
has two members,
ae1