Alcatel Carrier Internetworking Solutions Switch/Router 用户手册

Page 18-24

If the port to which these commands are being applied has been configured with the new 
interface commands its encapsulation will be displayed as 

 in the 

 command output. 

The user is alerted to this fact in these commands by the default response to the output 
format question in the 

 command being displayed as “

” instead of 

,

,

 or 

. A simple 

return will leave the options unchanged in this case. If the port is currently one of 

,

,

 or 

 

and the user types “

” in response the encapsulation is changed to 

 and the options are 

set to a null translation set.

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:

•

. This indicates that the port is using the default translation options applicable to the 

media type of this port. See above.

•

. 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.

•

. 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.

•

. 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 

 and observe the encapsulation 

offered and/or the default response for the pass through question.

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