H3C Technologies H3C S5120 Series Switches - Manual (Page 87)

1-6
Configuring Traffic Storm Protection
A traffic storm occurs when a large amount of broadcast, multicast, or unicast packets congest a
network. The S5120-SI switches provide two storm protection approaches:
z Storm suppression, which enables you to limit the size of monitored traffic passing through an
Ethernet port by setting a traffic threshold. When the traffic threshold is exceeded, the port discards
all exceeding traffic.
z Storm control, which enables you to shut down Ethernet ports or block traffic when monitored traffic
exceeds the traffic threshold. It also enables a port to send trap or log messages when monitored
traffic reaches a certain traffic threshold, depending on your configuration.
For a particular type of traffic, configure either storm suppression or storm control, but not both. If both of
them are configured, you may fail to achieve the expected storm control effect.
Configuring Storm Suppression
You can use the storm suppression function to limit the size of a particular type of traffic (currently
broadcast, multicast and unknown unicast traffic) on a per-interface basis in Ethernet port view or port
group view.
In interface or port group view, you set the maximum broadcast, multicast or unknown unicast traffic
allowed to pass through an interface or each interface in a port group. When the broadcast, multicast, or
unknown unicast traffic on the interface exceeds the threshold, the system discards packets until the
traffic drops below the threshold.
Follow these steps to set storm suppression ratios for one or multiple Ethernet ports:
To do… Use the command… Remarks
Enter system view system-view —
Enter
Ethernet port
view
interface interface-type
interface-number
Enter
Ethernet port
view or port
group view
Enter port
group view port-group manual
port-group-name
Use either command.
If configured in Ethernet port
view, this feature takes effect
on the current port only; if
configured in port group view,
this feature takes effect on all
ports in the port group.
Set the broadcast storm
suppression ratio broadcast-suppression { ratio |
pps max-pps | kbps max-bps }
Optional
By default, broadcast traffic is
not suppressed.
Set the multicast storm
suppression ratio multicast-suppression { ratio |
pps max-pps | kbps max-bps }
Optional
By default, multicast traffic is
not suppressed.
Set the unknown unicast
storm suppression ratio unicast-suppression { ratio | pps
max-pps | kbps max-bps }
Optional
By default, unknown unicast
traffic is not suppressed.