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Broadcast Storm As a broadcast storm develops, the number of broadcast packets received on a port
increases steadily. The Broadcast Storm controls make it possible to (1) prevent a broadcast storm from
spreading from one port to others, and (2) restore normal forwarding of broadcast packets when the
storm has abated.
The Rising Action control and its associated Threshold control specify what action (if any) the Switch
should take when broadcast traffic received on the port increases to or exceeds the equivalent of a
specified number of broadcast packets per second. The threshold can be set to 1 to 1,488,000 packets per
second (the default is 500); the rising action can be set to Do Nothing (this is the default), Block (that is,
discard all broadcast packets received on the port), or Block & Trap (discard all broadcast packets
received on the port and send a trap to the trap manager[s]).
The Falling Action control and its associated Threshold control specify what action (if any) the Switch
should take when broadcast traffic received on the port, after reaching or exceeding the "rising action"
threshold, decreases to or falls below the equivalent of a specified number of broadcast packets per
second. The threshold can be set to 1 to 1,488,000 packets per second (the default is 250); the falling
action can be set to Do Nothing (this is the default), Forward (that is, discontinue blocking of broadcast
packets received on the port), or Forward & Trap (discontinue blocking of broadcast packets received on
the port and send a trap to the trap manager[s]).
Press CTRL+S to let the changes take effect. If you wish these changes to be the default for the Switch,
return to the main menu and choose Save Changes.
STP Port State (whether the Spanning Tree Protocol is enabled or disabled on this port) and Status reflect the
current conditions of the port. They are read-only fields and cannot be changed.
Configure Port Mirroring
The Port Mirroring Configuration screen allows you to copy frames transmitted and received on a port
and redirect the copies to another port. You can attach a monitoring device to the mirrored port, such as a
sniffer or an RMON probe, to view details about the packets passing through the first port. This is useful for
network monitoring and troubleshooting purposes.
Choose Configure Port Mirroring on the System Configuration menu to access the Port Mirroring
Configuration screen:
To configure a mirror port, select the port from where you want to copy frames in the Source Port field. Then
select the port which receives the copies from the source port in the Target Port field. The target port is where
Figure 6-14. Port Mirroring Configuration screen
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Gigabit Ethernet Switch User's Guide
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