User's Manual

190
[no] switch port protected Sets or Cancels Port Isolation
exit Backs to the global configuration mode.
exit Backs to the EXEC mode.
25.3 Storm Control
The port of a switch may bear continuous and abnormal impact from unicast (MAC address fails to be
found), multicast or broadcast packets, and therefore gets paralyzed even to the extent that the whole switch
breaks down. That's why a mechanism must be provided to limit this phenomena. The storm control enables
the switch to set on the ingress the rates of different kinds of packets.
Command Purpose
config
Enters the global configuration mode.
interface g0/1 Enters the to-be-configured port.
[no] storm-control {broadcast | multicast
| unicast} threshold count
Configures the port storm block.
Unicast means that storm control is conducted to
the unknown unicast packets.
Multicast means that storm control is conducted to
the multicast packets.
Broadcast means that storm control is
conducted to the broadcast packets.
Count means to-be-configured threshold.
exit Backs to the global configuration mode.
exit Backs to the EXEC mode.
25.4 Rate Limit
Rate limit is used to limit the rate of a flow that runs through a port. Run the following command in the
EXEC mode to configure the rate limit.
Command Purpose
config Enters the global configuration mode.
interface g0/1 Enters the to-be-configured port.
[no] switchport rate-limit {band | Bandwidth
percent } { ingress | egress}
Configures the rate limit for a port.
Band is the limited rate.
Percent is the limited ratio.
ingress means to exert an influence on the
ingress.