Storm control, Figure 131 confi – Brocade Communications Systems Brocate Ethernet Access Switch 6910 User Manual
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Brocade 6910 Ethernet Access Switch Configuration Guide
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Storm Control
37
3. Set the rate limit for the individual ports,.
4. Click Apply.
FIGURE 131
Configuring Rate Limits
Storm Control
Use the Traffic > Storm Control page to configure broadcast, multicast, and unknown unicast storm
control thresholds. Traffic storms may occur when a device on your network is malfunctioning, or if
application programs are not well designed or properly configured. If there is too much traffic on
your network, performance can be severely degraded or everything can come to complete halt.
You can protect your network from traffic storms by setting a threshold for broadcast, multicast or
unknown unicast traffic. Any packets exceeding the specified threshold will then be dropped.
CLI References
•
Command Usage
•
Broadcast Storm Control is enabled by default.
•
Broadcast control does not effect IP multicast traffic.
•
When traffic exceeds the threshold specified for broadcast and multicast or unknown unicast
traffic, packets exceeding the threshold are dropped until the rate falls back down beneath the
threshold.
•
Traffic storms can be controlled at the hardware level using this command, or at the software
level using automatic storm control which triggers various control responses (see
on page 313). However, only one of these control types can be
applied to a port. Enabling hardware-level storm control on a port will disable automatic storm
control on that port.
•
The rate limits set by this function are also used by automatic storm control when the control
response is set to rate limiting by the
command.
•
Using both rate limiting and storm control on the same interface may lead to unexpected
results. For example, suppose broadcast storm control is set to 500 pps by the command
“switchport broadcast packet-rate 500" and the rate limit is set to 200 Mbps by the command
“rate-limit input 20" on a port. Since 200 Mbps is 1/5 of line speed (1000 Mbps), the received
rate will actually be 100 pps, or 1/5 of the 500 pps limit set by the storm control command. It
is therefore not advisable to use both of these commands on the same interface.