The following was reported by Andy Malis 

Eleven companies responded to the call for RFC 1293 and 1490 
implementation experience. 

Of the eleven, three asked that their information not be made public, 
and their responses have been summarized for informational purposes 
only. I will first list the RFC 1293 responses, and then the RFC 1490 
responses. Thanks to all those that sent in responses. 

Companies are listed in alphabetical order. 

RFC 1490: Note that almost no companies implemented fragmentation, 
which is one of the reasons that it is being removed from the next 
revision. Another reason is that the Frame Relay Forum has a new (and 
greatly improved) separate fragmentation specification, FRF.12. 

Ascend 
Missing features: XID negotiation, fragmentation 
Interworked with: Cisco, Bay, 3Com 

Assured Access 
Missing features: none 
Interworked with: Cisco 

Bay Networks 
Missing features: fragmentation 
Interworked with: Cisco, 3Com 

Cabletron Systems Inc 
Missing features: XID is not complete 
Interworked with: Cisco, Motorola, AT&T, Newbridge Networks 

Cisco 
Missing features: fragmentation 
Interworked with: "quite a few" 
Note: Cisco reported past interoperability problems for non-IP 
protocols such as bridging, Appletalk, and IPX over Frame Relay with 
some other vendors. However, there are no currently open trouble 
reports on this, and the correspondent believes the problems have been 
resolved. 

Motorola 
Missing features: fragmentation, I-frames 
Interworked with: Cisco, Bay, 3Com, IBM

Sync Research 
Missing features: fragmentation 
Interworked with: Sync, Cisco, IBM, 3Com, Bay, Xyplex, "and others" 

Xylan 
Missing features: 802.6 SMDS, source route bridging 
Interworked with: IBM (2210), Cisco (2500, 7000 series and other 
routers), Bay (Access Node and other routers), NSC (Borderguard), ACC 
(Nile) 

Of the other three respondents, two of the implementations were missing 
fragmentation, two were missing bridging, and the third incompletely 
implemented it, and one was missing I-frames. All three reported 
interoperating with Cisco, and two reported Bay, and one reported 
Newbridge and ACC as well.