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Configuring Our Internetwork with Multiple Ethernet Frame Types

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Configuring Our Internetwork with Multiple
Ethernet Frame Types

ou 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 inter-

faces and that you do not run LAN frames on a WAN interface.

Configuring Multiple Frame Types on the 2621A Router

To configure multiple frame types on the 2621A router, you'll need to add
three new IPX network numbers, one for each frame type you want to add.
When configuring multiple frame types, I like to use the primary number
plus a letter. In this configuration, use 10a for 802.2, 10b for Ethernet_II,
and 10c for SNAP.

For the following configuration, you will create one secondary address on

each router and two subinterfaces. You can do this any way you want, but
this is just the way I chose do it.

Here is the configuration for 2621A. Notice that when you use the ipx

network 10a encap

command and a question mark, you can see all the sup-

ported encapsulation types and the Cisco keywords.

2621A(config)#int f0/0

2621A(config-if)#ipx network 10a encap ?

arpa Novell Ethernet_II

hdlc HDLC on serial links

novell-ether Novell Ethernet_802.3

novell-fddi Novell FDDI RAW

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