H3C Technologies H3C S12500-X Series Switches - Manual (Page 34)

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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