CCNA Cisco Certified Network Associate Study Guide - FTP Server

Configuring Our Internetwork with Multiple Ethernet Frame Types 407
To define subinterfaces, use the interface ethernet port.number
command. You can use numbers between e0.0 and e0.4292967295—that’s
a lot of subinterfaces! An example of adding the 802.2 frame type is shown
below:
2621A(config)#int e0.10
2621A(config-subif)#ipx network 10a encap sap
2621A(config-subif)#^Z
2621A#
As I have mentioned before, there is no functional difference between the
secondary and subinterface commands on the IPX internetwork; it is
merely an administrative difference. You create subinterfaces instead of a
secondary for administrative control because you can place commands
under the subinterface that allow more granular control over the subinterface
and associated networks. If you use the secondary command instead,
the network is placed under the physical interface and any change you make
to the physical interface affects all networks.
Configuring Our Internetwork with
Multiple Ethernet Frame Types
You never really want to do this in a real product network. The only
time you would is if you were trying to support clients that just couldn’t run
the 802.2 frame type and you needed to support 802.3. Remember, the best
IPX network is one that uses only one frame type.
However, you should be aware of the different frame types and how they
are configured. This section will teach you just that. Let’s configure our
internetwork to run all possible frame types on the Ethernet LANs. This
way, when you see this configuration in a production network, you’ll know
what is wrong with it and why everyone is complaining that the network is
a notwork.
It is important to understand that this is performed only on the LAN interfaces
and that you do not run LAN frames on a WAN interface.