H3c-technologies H3C WX5500E Series Access Controllers Manuel d'utilisateur télécharger pdf (Page 20)

Ste

Command

Remarks

5. Set the unknown unicast

suppression threshold ratio.

unicast-suppression { ratio | pps

max-pps | kbps max-kbps }

Optional.

By default, unknown unicast traffic

is allowed to pass through an

interface.

Enabling loopback detection on an Ethernet interface

If a device receives a packet that it sent, a loop has occurred to the device. Loops might cause broadcast

storms, which degrade network performance. You can use this feature to detect whether a loop has

occurred.

Depending on whether the receiving interface is the same as the sending interface, loops fall into the

following types:

• Single-port loopback—Single-port loopback occurs when an interface receives a packet that it sent

and the receiving interface is the same as the sending interface, as shown in Figure 3.

• M

ulti-port loopback—Multi-port loopback occurs when a device receives a packet that it sent but

the receiving interface might not be the sending interface, as shown in Figure 4.

Figure 3 Single-port lo

opback

Figure 4 Multi-port loopback

You can enable loopback detection to detect loops on an interface and, if the interface supports the

loopback-detection action command, configure the protective action to take on the receiving interface

when a loop is detected, for example, to shut down the interface. Depending on whether a protective

action is configured, the device takes the actions in Table 1 to alle

viate the impact of the loop condition.

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H3c-technologies H3C WX5500E Series Access Controllers Manuel d'utilisateur Page 20