Alcatel Carrier Internetworking Solutions Omni Switch/Router - Manual (Page 513)

The User Interface
Page 18-17
The addvp, modvp and crgp Commands
All of these commands include in their dialogue an Output Format question for ports and a
subsidiary IEEE 802.2 Pass through option.
The options offered are:
• a default,
• Ethertype,
• SNAP and
• LLC.
Each of these represents a set of translation options for the IP and IPX protocols. The names
chosen for these sets basically represent the translations for IPX with the translation for IP
being implied.
For example, LLC represents a translation set where all IPX encapsulations are configured to
translate to IEEE 802.2. This is not a valid encapsulation for IP which is therefore configured
to a default appropriate to the media, Ethertype for Ethernet ports and SNAP for FDDI and
Token Ring ports. The translation of all other protocol types and encapsulations is fixed by
the Omni Switch/Router. Thus AppleTalk is never translated and Ethertype/SNAP based
protocols follow the IP option.
For those options which imply a translation of IEEE 802.2 IPX frames to something else a
subsidiary question is asked, “IEEE 802.2 IPX Pass Through(y/n):” An IEEE 802.2 pass through
option is provided because 4.1 Novell servers use this encapsulation by default and it is
becoming Novell’s encapsulation of choice.
The Default Translation Option
The meaning of the default is determined separately for each media type and is fully config-
urable. The factory defaults are chosen so that the latest release is fully compliant with earlier
ones. The default translation option is provided to allow a “single point of configuration of all
ports” capability. When the default option for a media is changed all ports of that media type
whose encapsulation is configured as default will inherit the new translation setting. All MAC
address-based translation options which were inherited from those ports, as opposed to those
set by AutoTracker, will also be updated. Ports which have an encapsulation setting other
than default will be unaffected.