Cabletron Systems SmartSTACK 10 ELS10-26, User Manual

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Configuring Your ELS10-26
3-19
5. LCM prompts you to verify the new community name by
retyping it.
6. Retype the new community name.
3.13 CONFIGURING BROADCAST/MULTICAST STORM
PROTECTION
The ELS10-26 provides automatic protection against
broadcast/multicast storms. Multicast storms are excessive
broadcasts to all ports, typically caused by a malfunctioning
device. They can result in severe network performance problems,
including causing the network to crash.
To protect against broadcast/multicast storms, you must define an
acceptable rate for multicast traffic across a port. In many ways,
this feature is similar to filtering.
Each ELS10-26 port can be individually configured for automatic
multicast storm protection. You define what level of multicasts the
ELS10-26 will recognize as a multicast storm by specifying the
number of multicast packets that can be transmitted within a given
time period.
For example, if you configure ELS10-26 to transmit onto Port 3 no
more than five multicasts per 60 seconds, any multicasts destined
for Port 3 are discarded after the first five multicasts. After 60
seconds have elapsed, another five multicasts to Port 3 will be
allowed. This maintains an effective maximum rate of five
multicast packets per minute.
The two Management Information Base (MIB) variables for
configuring multicast storm protection are:
Note:
LCM does not allow you to configure for multicast storm
protection. You must use an SNMP-based NMS. See the
documentation that came with your NMS for configuration
instructions.