Configuring Link Compensation; Configuring Storm Suppression - H3C S6850 Series Configuration Manual

By default, the FEC mode of an Ethernet interface is autonegotiation.

Configuring link compensation

About link compensation
As the signal transmission rate or frequency increases, high frequency components in signals
attenuate more severely. For signal transmission performance, common signal compensation
technologies such as pre-emphasis and equalization are introduced. Pre-emphasis amplifies high
frequency components but increases the probability of crosstalk. Equalization is introduced to filter
out high frequency crosstalk on the receiving end.
Link compensation enables the sending and receiving ends to exchange pre-emphasis and
equalization parameters through frames. This feature improves the performance of pre-emphasis
and equalization.
Restrictions and guidelines
Only 25-GE Ethernet interfaces connected through copper cables support this command. For 25-GE
interfaces connected through copper cables to operate properly, you must enable link compensation.
You must enable or disable link compensation on both interfaces of a link.
Typically, the link compensation status is controlled by the software, and do not adjust the link
compensation status as a best practice. Use this command to adjust the link compensation status
only when the interface cannot come up.
Procedure
1. Enter system view.
system-view
2. Enter Ethernet interface view.
interface interface-type interface-number
3. Configure link compensation on the interface.
port training { disable | enable }
By default, link compensation is disabled on an interface.

Configuring storm suppression

About 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.
Restrictions and guidelines
•
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
•
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.
interface."
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