rfc1434.ps

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306 86 424 (Network Working Group) 424 SB
1941 86 165 (R.  Dixon) 165 SB
306 136 503 (Request for Comments:  1434) 503 SB
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306 782 660 (Distribution of this memo is unlimited.) 660 SB
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306 883 249 (Abstract) 249 SB
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306 1011 1774 (This RFC describes IBM's support of Data Link Switching over TCP/IP.  The RFC is being distributed to) 1774 SB
306 1061 1702 (members of the Internet community in order to solicit their reactions to the proposals contained in it.) 1702 SB
306 1111 1777 (While the issues discussed may not be directly relevant to the research problems of the Internet, they may) 1777 SB
306 1161 1014 (be interesting to a number of researchers and implementors.) 1014 SB
306 1261 1742 (Any questions or comments relative to the contents of this RFC should be sent to the following Internet) 1742 SB
306 1312 160 (address:  ) 160 SB
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306 365 1797 (Data Link Switching \(DLS\) is a forwarding mechanism for the IBM SNA and IBM NetBIOS protocols.  It) 1797 SB
306 415 1758 (does not provide full routing, but instead provides switching at the Data Link layer and encapsulation in) 1758 SB
306 465 1795 (TCP/IP for transport over the Internet.  This memo documents the Switch-to-Switch Protocol \(SSP\) that is) 1795 SB
306 515 763 (used between IBM 6611 Network Processors.) 763 SB
306 615 1734 (Today, the IBM 6611 supports SNA \(PU 2 and PU 4\) systems and NetBIOS systems attached to token-) 1734 SB
306 665 1697 (ring networks, as well as SNA \(PU 2\) systems attached to SDLC links.  For the later case, the SDLC) 1697 SB
306 715 1686 (attached systems are provided with a LAN appearance within the IBM 6611.  For the LAN attached) 1686 SB
306 765 1781 (systems, the IBM 6611 appears as a source-routing bridge.  Remote systems that are accessed through the) 1781 SB
306 815 1735 (IBM 6611 appear as systems attached to an adjacent ring.  This ring is a virtual ring that is manifested) 1735 SB
306 865 392 (within each IBM 6611.) 392 SB
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306 966 344 (2. Overview) 344 SB
32 0 0 42 42 0 0 0 38 /Times-Roman /font44 ANSIFont font
306 1094 1754 (Data Link Switching was developed to provide support for SNA and NetBIOS in multi-protocol routers.) 1754 SB
306 1144 1729 (Since SNA and NetBIOS are basically connection oriented protocols, the Data Link Control procedure) 1729 SB
306 1194 1750 (that they use on the LAN is IEEE 802.2 Logical Link Control \(LLC\) Type 2.  Data Link Switching also) 1750 SB
306 1244 1196 (accommodates SNA protocols over WAN links via the SDLC protocol.) 1196 SB
306 1344 1773 (IEEE 802.2 LLC Type 2 was designed with the assumption that the network transit delay would be small) 1773 SB
306 1394 1663 (and predictable \(i.e., a local LAN\).  Therefore the LLC elements of procedure use a fixed timer for) 1663 SB
306 1444 1659 (detecting lost frames.  When bridging is used over wide area lines \(especially at lower speeds\), the) 1659 SB
306 1494 1769 (network delay is larger and it can vary greatly based upon congestion.  When the delay exceeds the time-) 1769 SB
306 1544 1762 (out value LLC attempts to retransmit.  If the frame is not actually lost, only delayed, it is possible for the) 1762 SB
306 1594 1619 (LLC Type 2 procedures to become confused.  And as a result, the link is eventually taken down.) 1619 SB
306 1694 1749 (Given the use of LLC Type 2 services, Data Link Switching addresses the following bridging problems:) 1749 SB
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456 1794 266 (DLC Time-outs) 266 SB
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456 1844 664 (DLC Acknowledgments over the WAN) 664 SB
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456 1894 499 (Flow and Congestion Control) 499 SB
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456 1944 615 (Broadcast Control of Search Packets) 615 SB
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456 1994 705 (Source-Route Bridging Hop Count Limits) 705 SB
306 2094 1717 (NetBIOS also makes extensive use of datagram services that use LLC Type 1.  In this case, Data Link) 1717 SB
306 2144 1003 (Switching addresses the last two problems in the above list.) 1003 SB
306 2244 1785 (The principal difference between Data Link Switching and bridging is that DLS terminates the Data Link) 1785 SB
306 2294 1737 (Control whereas bridging does not.  The following figure illustrates this difference based upon two end) 1737 SB
306 2344 758 (systems operating with LLC Type 2 services.) 758 SB
306 2986 260 (Dixon & Kushi) 260 SB
1965 2986 106 ([Page ) 106 SB
2071 2986 21 (3) 21 SB
2092 2986 14 (]) 14 SB
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1900 86 206 (March 1993) 206 SB
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