Alcatel Carrier Internetworking Solutions Omni Switch/Router - Manual (Page 520)

The User Interface
Page 18-24
Interaction with the new interface
If the port to which these commands are being applied has been configured with the new
interface commands its encapsulation will be displayed as
SWCH in the vi command output.
The user is alerted to this fact in these commands by the default response to the output
format question in the
modvp command being displayed as “ * ” instead of d , e , s or l . A simple
return will leave the options unchanged in this case. If the port is currently one of d , e , s or l
and the user types “ * ” in response the encapsulation is changed to SWCH and the options are
set to a null translation set.
The “vi” Command
The encaps column displays the encapsulation subset options set for each port. If the port has
been configured with the new interface this is indicated by displaying “SWCH.” The “canned”
subsets offered in this interface are displayed as follows:
• DFLT . This indicates that the port is using the default translation options applicable to the
media type of this port. See above.
• 802.2 . This indicates that IPX frames of any encapsulation will be encapsulated with IEEE
802.2. Non-IPX frames other than AppleTalk will be transformed to Ethertype on Ethernet
ports and SNAP on FDDI or Token Ring ports. AppleTalk frames are never transformed.
• SNAP . This indicates that Ethertype frames of all protocols and IPX proprietary frames will
be translated to SNAP and all SNAP frames will be left as is.
IEEE 802.2 encapsulated IPX frames may be left as is if the IEEE 802.2 pass through option
is in effect for this port. All other IEEE 802.2 encapsulated protocols are left as is.
• ETH . This indicates that SNAP frames of all protocols except AppleTalk will be translated to
Ethertype.
SNAP and Proprietary IPX frames will be transformed to Ethertype.
IEEE 802.2 encapsulated IPX frames may be left as is if the IEEE 802.2 pass through option
is in effect for this port.
All other IEEE 802.2 encapsulated protocols are left as is.
To discover whether IEEE 802.2 pass through is in effect on a port the user must either use
the swch command from the switch menu or use
modvp and observe the encapsulation
offered and/or the default response for the pass through question.
ATM LANE - LLC Mode
IPX frames are translated to 802.2 LLC.
All other SNAP frames from FDDI, Token Ring, and Ethernet SNAP are
translated to Ethertype. However, Appletalk ARP SNAP frames from Token
Ring and FDDI are left as SNAP; Banyan Vines frames from FDDI are trans-
lated to Ethertype.
All other LLC frames are not translated. The exception is Banyan Vines
frames from Token Ring, which are translated to Ethertype