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Configuring MAC address entries
Configuration guidelines
• You cannot add a dynamic MAC address entry if a learned entry already exists with a different
outgoing interface for the MAC address.
• The manually configured static, blackhole, and multiport unicast MAC address entries cannot
survive a reboot if you do not save the configuration. The manually configured dynamic MAC
address entries are lost upon reboot whether or not you save the configuration.
A frame whose source MAC address matches different types of MAC address entries is processed
differently.
Type Description
Static MAC address entry
• Discards the frame received on a different interface from that in the entry.
• Forwards the frame received on the same interface with that in the entry.
Multiport unicast MAC
address entry
• Learns the MAC address (for example, MAC A) of the frame, generates a
dynamic MAC address entry for MAC A, and forwards the frame.
However, the generated dynamic MAC address entry does not take
effect. Frames destined for MAC A are forwarded based on the multiport
unicast MAC address entry.
Dynamic MAC address
entry
• Learns the MAC address of the frames received on a different interface
from that in the entry and overwrites the original entry.
• Forwards the frame received on the same interface as that in the entry
and updates the aging timer for the entry.
Adding or modifying a static or dynamic MAC address entry
globally
Step Command Remarks
1. Enter system view.
system-view
N/A
2. Add or modify a
static or dynamic
MAC address
entry.
mac-address
{
dynamic
|
static
}
mac-address
interface
interface-type interface-number
vlan
vlan-id
By default, no MAC address
entry is configured globally.
Make sure you have created
the VLAN and assigned the
interface to the VLAN.
Adding or modifying a static or dynamic MAC address entry
on an interface
Step Command Remarks
1. Enter system view.
system-view
N/A
2. Enter interface view.
• Enter Layer 2 Ethernet
interface view:
interface interface-type
interface-number
• Enter Layer 2 aggregate
N/A
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