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H3C Technologies H3C S12500-X Series Switches User Manual

Page 34

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23

Step Command

Remarks

2.

Add or modify a blackhole

MAC address entry.

mac-address blackhole
mac-address vlan vlan-id

By default, no blackhole MAC

address entry is configured.
Make sure you have created the
VLAN.

Adding or modifying a multiport unicast MAC address entry

You can configure a multiport unicast MAC address entry to associate a unicast destination MAC

address with multiple ports, so that the frame with a destination MAC address matching the entry is

forwarded out of multiple ports. For example, in NLB unicast mode, all servers within the cluster uses the

cluster's MAC address as their own address, and frames destined for the cluster are forwarded to every
server. In this case, you can configure a multiport unicast MAC address entry on the device connected to

the group of servers. In this manner, the device forwards the frame destined for the server group through

all ports connected to the servers within the cluster.

Figure 3 NLB cluster

You can configure a multiport unicast MAC address entry globally or on an interface.

Configuring a multiport unicast MAC address entry globally

Step Command

Remarks

1.

Enter system view.

system-view

N/A

2.

Add or modify a multiport
unicast MAC address entry.

mac-address multiport
mac-address interface interface-list

vlan vlan-id

By default, no multiport unicast
MAC address entry is configured

globally.
Make sure you have created the

VLAN and assigned the interface
to the VLAN.
Do not configure an interface as
the output interface of a multiport

unicast MAC address entry if the
interface receives frames destined

for the multiport unicast MAC

address. Otherwise, the frames are
flooded in the VLAN to which they

belong.

NLB

cluster

Device

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