rfc1434.ps

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306 978 121 (Figure ) 121 SB
427 978 21 (1) 21 SB
448 978 785 (.  Data Link Switching Contrasted to Bridging) 785 SB
306 1078 1732 (In traditional bridging, the Data Link Control is end-to-end.  Data Link Switching terminates the LLC) 1732 SB
306 1128 1779 (Type 2 connection at the switch.  This means that the LLC Type 2 connections do not cross the wide area) 1779 SB
306 1178 1773 (network.  The DLS multiplexes LLC connections onto a TCP connection to another DLS.  Therefore, the) 1773 SB
306 1228 1716 (LLC connections at each end are totally independent of each other.  It is the responsibility of the Data) 1716 SB
306 1278 1750 (Link Switch to deliver frames that it has received from a LLC connection to the other end.  TCP is used) 1750 SB
306 1328 1088 (between the Data Link Switches to guarantee delivery of frames.) 1088 SB
306 1428 1761 (As a result of this design, LLC time-outs are limited to the local LAN \(i.e., they do not traverse the wide) 1761 SB
306 1478 1768 (area\).  Also, the LLC Type 2 acknowledgments \(RR's\) do not traverse the WAN, thereby reducing traffic) 1768 SB
306 1528 1770 (across the wide area links.  For SDLC links, polling and poll response occurs locally, not over the WAN.) 1770 SB
306 1578 1775 (Broadcast of search frames is controlled by the Data Link Switches once the location of a target system is) 1775 SB
306 1628 1712 (discovered.  Finally, the switches can now apply back pressure to the end systems to provide flow and) 1712 SB
306 1678 322 (congestion control.) 322 SB
306 1778 1761 (Data Link Switching uses LAN addressing to set up connections between SNA systems.  SDLC attached) 1761 SB
306 1828 1783 (devices are defined with MAC addresses to enable them to communicate with LAN attached devices.  For) 1783 SB
306 1878 1681 (NetBIOS systems, Data Link Switching uses the NetBIOS name to forward datagrams and to set up) 1681 SB
306 1928 1782 (connections for NetBIOS sessions.  For circuit establishment, SNA systems send TEST \(or in some cases,) 1782 SB
306 1978 1777 (XID\) frames to the null \(x'00'\) SAP.  NetBIOS systems have an address resolution procedure, based upon) 1777 SB
306 2028 1582 (the Name Query and Name Recognized frames, that is used to establish an end-to-end circuit.) 1582 SB
306 2128 1780 (Since Data Link Switching may be implemented in multi-protocol routers,  there may be situations where) 1780 SB
306 2178 1765 (both bridging and switching are enabled.  SNA frames can be identified by their link SAP.  Typical SAP) 1765 SB
306 2228 1542 (values for  SNA are x'04', x'08', and x'0C'.  NetBIOS always uses a link SAP value of x'F0'.) 1542 SB
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306 2329 708 (3. Transport Connection) 708 SB
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306 2457 1766 (Data Link Switches can be in used in pairs or by themselves.  A Single DLS internally switches one data) 1766 SB
306 2507 1741 (link to another without using TCP \(DLC\(1\) to DLC\(2\) in the figure below\).  A paired DLS multiplexes) 1741 SB
306 2557 1787 (data links over a reliable transport using a Switch-to-Switch Protocol \(SSP\).  This RFC will document the) 1787 SB
306 2607 1537 (frame formats and protocols for this multiplexing between Data Link Switches.  The initial) 1537 SB
306 2657 1751 (implementation of SSP uses TCP as the reliable transport between Data Link Switches.  However, other) 1751 SB
306 2707 906 (transport connections such as OSI TP4 could be used.) 906 SB
306 2986 260 (Dixon & Kushi) 260 SB
1965 2986 106 ([Page ) 106 SB
2071 2986 21 (4) 21 SB
2092 2986 14 (]) 14 SB
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