22
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
Forwards the frame according to the destination MAC address regardless of
whether the frame's ingress interface is the same as that in the entry.
Multiport unicast MAC
address entry
•
Learns the MAC address (MACA) of the frame and generates a dynamic
MAC address entry, but the generated dynamic MAC address entry does
not take effect.
•
Forwards frames destined for MACA based on the multiport unicast MAC
address entry.
Blackhole MAC address
entry
Drops the frame.
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
N/A