HPE FlexFabric 5940 SERIES

10
Configuring storm suppression
The storm suppression feature ensures that the size of a particular type of traffic (broadcast,
multicast, or unknown unicast traffic) does not exceed the threshold on an interface. When the
broadcast, multicast, or unknown unicast traffic on the interface exceeds this threshold, the system
discards packets until the traffic drops below this threshold.
Both storm suppression and storm control can suppress storms on an interface. Storm suppression
uses the chip to suppress traffic. Storm suppression has less impact on the device performance than
storm control, which uses software to suppress traffic.
Configuration restrictions and guidelines
When you configure storm suppression, follow these restrictions and guidelines:
• An interframe gap exists between each two continuous frames. The system excludes the time
of interframe gaps in monitoring the traffic size on the interface. The configured suppression
thresholds must be less than the total traffic that passes through the interface.
• For the traffic suppression result to be determined, do not configure storm control together with
storm suppression for the same type of traffic. For more information about storm control, see
"Configuring storm control on an Ethernet interface."
• Storm suppression configured on a Layer 3 Ethernet interface applies to the interface and its
subinterfaces if it is on a boarder gateway of the following networks:
{ VXLAN IP gateway network.
{ EVPN gateway network.
For more information about VXLAN IP gateway and EVPN gateway networks, see VXLAN
Configuration Guide and EVPN Configuration Guide.
• When you configure the suppression threshold in kbps, the actual suppression threshold might
be different from the configured one as follows:
{ If the configured value is smaller than 64, the value of 64 takes effect.
{ If the configured value is greater than 64 but not an integer multiple of 64, the integer
multiple of 64 that is greater than and closest to the configured value takes effect.
For the suppression threshold that takes effect, see the prompt on the device.
Configuration procedure
To set storm suppression thresholds on an Ethernet interface:
Step Command Remarks
1. Enter system view.
system-view
N/A
2. Enter Ethernet interface
view.
interface
interface-type
interface-number
N/A
3. Enable broadcast
suppression and set the
broadcast suppression
threshold.
broadcast-suppression
{ ratio |
pps
max-pps |
kbps
max-kbps }
By default, broadcast suppression
is disabled.
4. Enable multicast
suppression and set the
multicast suppression
threshold.
multicast-suppression
{ ratio |
pps
max-pps |
kbps
max-kbps }
[
unknown
]
By default, multicast suppression
is disabled.
5. Enable unknown unicast
suppression and set the
unknown unicast
suppression threshold.
unicast-suppression
{ ratio |
pps
max-pps |
kbps
max-kbps }
By default, unknown unicast
suppression is disabled.