Operating Mechanism Of Smart Link; Configuring Smart Link - H3C S3100 Series Operation Manual

H3c s3100 series ethernet switches operation manual

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Operating Mechanism of Smart Link

Figure 1-2 Network diagram of Smart Link operating mechanism

When the link connected to Ethernet1/0/1 fails, Ethernet1/0/1 is blocked automatically, and the state of

Ethernet1/0/2 turns to active state.

When link switching occurs in the Smart Link group, MAC forwarding entries and ARP entries of

each device in the network may be out of date. In order to guarantee correct packet transmission,

you must enable the Smart Link device to send flush messages to notify the other devices in the

network to refresh their own MAC forwarding entries and ARP entries. In this case, all the uplink

devices must be capable of identifying flush messages from the Smart Link group and refreshing

MAC forwarding entries and ARP entries.

On a Smart Link–enabled device, if a port is blocked due to link failure, the port remains blocked

after the link recovers from the failure, and does not preempt the traffic resource. Therefore, the

traffic stays stable. The port does not come into the forwarding state until the next link switching.

Before configuring a member port of a Smart Link group, you must:

Disable the port to avoid loops, thus preventing broadcast storm.

Disable STP on the port.

After completing the configuration, you need to enable the Ethernet ports disabled before configuring

the Smart Link group.

1-2, Ethernet1/0/1 on Switch A is active and Ethernet1/0/2 on Switch A is blocked.

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