Alcatel Carrier Internetworking Solutions Switch/Router ユーザーズマニュアル

Page 18-14

You will configure frame encapsulation based on the destination MAC address or the destina-
tion switch port. Whether a frame is encapsulated based on the destination MAC or the port 
depends whether the frame has a unicast, multicast, or broadcast destination.

Such frames will be handled in two ways:

•

. If the frame has a unicast destination address which has been learned 

on a particular port, the encapsulation translation choices are driven by options associated 
with the destination MAC address.

•

. If the frame has a unicast destination address which has not been 

learned on a particular port, or if the destination address is a multicast address, then the 
frame has to be transmitted on potentially many ports. In this case the encapsulation trans-
lation choices are driven by options associated with each destination port.

The translation options for ports allow configuration of IP and IPX protocols on a per encap-
sulation basis.

The translation options for MACs arises from two possible sources.

• Inheritance from Port Options During Source Address Learning

• When a source MAC address is learned, the translation options of the port on which it is 

learned are copied into the MAC-based database.

• Automatic Determination by AutoTracker

• When a frame is processed by AutoTracker as part of determining the VLAN to be associ-

ated with the MAC the frames protocol type and encapsulation are also determined. This 
information is used to update/set the translation options in the MAC based database.

Which of these options is used is determined by setting the autoencaps option.