rfc1434.ps

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151 20 687 756 E1 FSn152 20 1692 756 E1 FSn0 0 0 fC1346 841 M 0 -18 -40 9 40 9 3 PP1 FSngs 1902 742 255 234 CB416 803 54 (Info) 54 SBgrgs 1902 742 255 234 CB845 844 42 (RR) 42 SBgr1014 851 M 337 0 1 PPSn419 839 M 474 0 1 PPSn887 830 M 0 -18 -41 9 41 9 3 PP1 FSn925 873 M -474 0 1 PPSn456 864 M 0 -19 40 10 -40 9 3 PP1 FSngs 1902 742 255 234 CB1449 837 54 (Info) 54 SBgrgs 1902 742 255 234 CB1878 878 42 (RR) 42 SBgr1452 873 M 474 0 1 PPSn1921 864 M 0 -18 -40 9 40 9 3 PP1 FSn1958 907 M -474 0 1 PPSn1490 898 M 0 -19 41 10 -41 9 3 PP1 FSngs 1902 742 255 234 CB1110 705 93 (TCP/IP) 93 SBgrgs 1902 742 255 234 CB1019 815 54 (Info) 54 SBgr255 255 255 fC1819 3 296 969 B1 Fn0 0 0 fC2 2 293 973 B1 Fn2 2 293 973 B1 Fn1819 2 296 973 B1 Fn2 2 2116 973 B1 Fn2 2 2116 973 B1 Fn2 267 293 705 B1 Fn2 267 2116 705 B1 Fn32 0 0 42 42 0 0 0 38 /Times-Roman /font44 ANSIFont font306 978 121 (Figure ) 121 SB427 978 21 (1) 21 SB448 978 785 (.  Data Link Switching Contrasted to Bridging) 785 SB306 1078 1732 (In traditional bridging, the Data Link Control is end-to-end.  Data Link Switching terminates the LLC) 1732 SB306 1128 1779 (Type 2 connection at the switch.  This means that the LLC Type 2 connections do not cross the wide area) 1779 SB306 1178 1773 (network.  The DLS multiplexes LLC connections onto a TCP connection to another DLS.  Therefore, the) 1773 SB306 1228 1716 (LLC connections at each end are totally independent of each other.  It is the responsibility of the Data) 1716 SB306 1278 1750 (Link Switch to deliver frames that it has received from a LLC connection to the other end.  TCP is used) 1750 SB306 1328 1088 (between the Data Link Switches to guarantee delivery of frames.) 1088 SB306 1428 1761 (As a result of this design, LLC time-outs are limited to the local LAN \(i.e., they do not traverse the wide) 1761 SB306 1478 1768 (area\).  Also, the LLC Type 2 acknowledgments \(RR's\) do not traverse the WAN, thereby reducing traffic) 1768 SB306 1528 1770 (across the wide area links.  For SDLC links, polling and poll response occurs locally, not over the WAN.) 1770 SB306 1578 1775 (Broadcast of search frames is controlled by the Data Link Switches once the location of a target system is) 1775 SB306 1628 1712 (discovered.  Finally, the switches can now apply back pressure to the end systems to provide flow and) 1712 SB306 1678 322 (congestion control.) 322 SB306 1778 1761 (Data Link Switching uses LAN addressing to set up connections between SNA systems.  SDLC attached) 1761 SB306 1828 1783 (devices are defined with MAC addresses to enable them to communicate with LAN attached devices.  For) 1783 SB306 1878 1681 (NetBIOS systems, Data Link Switching uses the NetBIOS name to forward datagrams and to set up) 1681 SB306 1928 1782 (connections for NetBIOS sessions.  For circuit establishment, SNA systems send TEST \(or in some cases,) 1782 SB306 1978 1777 (XID\) frames to the null \(x'00'\) SAP.  NetBIOS systems have an address resolution procedure, based upon) 1777 SB306 2028 1582 (the Name Query and Name Recognized frames, that is used to establish an end-to-end circuit.) 1582 SB306 2128 1780 (Since Data Link Switching may be implemented in multi-protocol routers,  there may be situations where) 1780 SB306 2178 1765 (both bridging and switching are enabled.  SNA frames can be identified by their link SAP.  Typical SAP) 1765 SB306 2228 1542 (values for  SNA are x'04', x'08', and x'0C'.  NetBIOS always uses a link SAP value of x'F0'.) 1542 SB32 0 0 67 67 0 0 0 61 /Times-Bold /font41 ANSIFont font306 2329 708 (3. Transport Connection) 708 SB32 0 0 42 42 0 0 0 38 /Times-Roman /font44 ANSIFont font306 2457 1766 (Data Link Switches can be in used in pairs or by themselves.  A Single DLS internally switches one data) 1766 SB306 2507 1741 (link to another without using TCP \(DLC\(1\) to DLC\(2\) in the figure below\).  A paired DLS multiplexes) 1741 SB306 2557 1787 (data links over a reliable transport using a Switch-to-Switch Protocol \(SSP\).  This RFC will document the) 1787 SB306 2607 1537 (frame formats and protocols for this multiplexing between Data Link Switches.  The initial) 1537 SB306 2657 1751 (implementation of SSP uses TCP as the reliable transport between Data Link Switches.  However, other) 1751 SB306 2707 906 (transport connections such as OSI TP4 could be used.) 906 SB306 2986 260 (Dixon & Kushi) 260 SB1965 2986 106 ([Page ) 106 SB2071 2986 21 (4) 21 SB2092 2986 14 (]) 14 SB1 #CEJ RS%%PageTrailer%%PageResources: font AvantGarde-Book%%+ font Helvetica-Bold%%+ font Times-Bold%%+ font Times-Roman%%Page: 5 5%%PageResources: (atend)SS0 0 23 22 803 1100 300 SM32 0 0 42 42 0 0 0 38 /Times-Roman /font44 ANSIFont font0 0 0 fC306 86 196 (RFC:  1434) 196 SB928 86 555 (DLS:  Switch-to-Switch Protocol) 555 SB1900 86 206 (March 1993) 206 SB0 0 0 fC/fm 256 def2 2 456 234 B1 Fn2 2 456 234 B1 Fn1468 2 459 234 B1 Fn2 2 1928 234 B1 Fn2 2 1928 234 B1 Fn2 587 456 237 B1 Fn2 587 1928 237 B1 Fn2 2 456 825 B1 Fn2 2 456 825 B1 Fn1468 2 459 825 B1 Fn2 2 1928 825 B1 Fn2 2 1928 825 B1 Fn255 255 255 fCgs 1469 588 459 237 CB1468 801 459 78 B1 Fngr32 0 0 19 19 0 0 0 16 /Times-Roman /font44 ANSIFont font0 0 0 fCgs 1469 588 459 237 CB1717 845 5 ( ) 6 SB1723 845 11 (P) 15 SB1738 845 8 (a) 11 SB1749 845 9 (g) 14 SB1763 845 8 (e) 11 SB1774 845 5 ( ) 7 SB1781 845 10 (#) 13 SB1794 845 10 (#) 13 SBgr32 0 0 19 19 0 0 0 17 /Times-Bold /font41 ANSIFont fontgs 1469 588 459 237 CB633 844 14 (N) 19 SB652 844 9 (e) 11 SB663 844 6 (t) 9 SB672 844 14 (w) 19 SB691 844 10 (o) 13 SB704 844 8 (r) 12 SB716 844 11 (k) 15 SB731 844 5 (i) 7 SB738 844 10 (n) 15 SB753 844 10 (g) 13 SB766 844 5 ( ) 6 SB772 844 11 (S) 15 SB787 844 9 (y) 13 SB800 844 8 (s) 11 SB811 844 6 (t) 8 SB819 844 9 (e) 12 SB831 844 15 (m) 22 SB853 844 8 (s) 10 SBgr1 lc1 lj145 145 145 pC0 1 SP145 145 145 fCgs 0 0 0 0 CB573 843 M -1240 0 0 -1 1240 0 0 1 4 PP0 FSngr0 0 255 pC0 0 255 fCgs 0 0 0 0 CB573 837 M -1240 0 0 -3 1240 0 0 3 4 PP0 FSngr0 0 0 fCgs 0 0 0 0 CB578 862 M -8 0 0 1 8 0 0 -1 4 PP1 Fngrgs 0 0 0 0 CB578 860 M -8 0 0 1 8 0 0 -1 4 PP1 Fngrgs 0 0 0 0 CB580 858 M -4 0 0 1 4 0 0 -1 4 PP1 Fngrgs 0 0 0 0 CB580 856 M -4 0 0 1 4 0 0 -1 4 PP1 Fngrgs 0 0 0 0 CB580 854 M -4 0 0 1 4 0 0 -1 4 PP1 Fngrgs 0 0 0 0 CB580 852 M -4 0 0 0 4 0 0 0 4 PP1 Fngrgs 0 0 0 0 CB578 851 M -8 0 0 1 8 0 0 -1 4 PP1 Fngrgs 0 0 0 0 CB578 849 M -8 0 0 1 8 0 0 -1 4 PP1 Fngrgs 0 0 0 0 CB588 849 M -13 0 2 1 2 0 9 0 0 -1 5 PP1 Fngrgs 0 0 0 0 CB588 851 M -14 0 0 1 14 0 0 -1 4 PP1 Fngrgs 0 0 0 0 CB590 852 M -4 0 0 0 4 0 0 0 4 PP1 Fngrgs 0 0 0 0 CB598 852 M -4 0 -1 0 5 0 0 0 4 PP1 Fngrgs 0 0 0 0 CB590 854 M -11 0 -1 1 12 0 0 -1 4 PP1 Fngrgs 0 0 0 0 CB590 856 M -12 0 2 1 10 0 0 -1 4 PP1 Fngrgs 0 0 0 0 CB590 858 M -4 0 0 1 4 0 0 -1 4 PP1 Fngrgs 0 0 0 0 CB598 858 M -5 0 1 1 4 0 0 -1 4 PP1 Fngrgs 0 0 0 0 CB588 860 M -14 0 0 1 14 0 0 -1 4 PP1 Fngrgs 0 0 0 0 CB588 862 M -9 0 -2 0 -2 1 13 0 0 -1 5 PP1 Fngrgs 0 0 0 0 CB605 862 M -6 0 0 1 6 0 0 -1 4 PP1 Fngrgs 0 0 0 0 CB615 862 M -1 1 1 0 0 -1 3 PP1 Fngrgs 0 0 0 0 CB620 862 M -6 0 0 1 6 0 0 -1 4 PP1 Fngrgs 0 0 0 0 CB620 860 M -6 0 0 1 6 0 0 -1 4 PP1 Fngrgs 0 0 0 0 CB614 860 M -2 0 -1 1 3 0 0 -1 4 PP1 Fngrgs 0 0 0 0 CB605 860 M -6 0 0 1 6 0 0 -1 4 PP1 Fngrgs 0 0 0 0 CB607 858 M -4 0 0 1 4 0 0 -1 4 PP1 Fngrgs 0 0 0 0 CB613 858 M -4 0 -1 1 5 0 0 -1 4 PP1 Fngrgs 0 0 0 0 CB620 858 M -4 0 0 1 4 0 0 -1 4 PP1 Fngrgs 0 0 0 0 CB620 856 M -4 0 0 1 4 0 0 -1 4 PP1 Fngrgs 0 0 0 0 CB612 856 M -6 0 -1 1 7 0 0 -1 4 PP1 Fngrgs 0 0 0 0 CB607 856 M -4 0 0 1 4 0 0 -1 4 PP1 Fngrgs 0 0 0 0 CB607 854 M -4 0 0 0 0 0 -4 0 0 1 8 0 0 -1 7 PP1 Fngrgs 0 0 0 0 CB615 854 M -4 0 -1 0 0 0 -4 0 0 1 8 0 1 -1 7 PP1 Fngrgs 0 0 0 0 CB617 852 M -7 0 0 0 7 0 0 0 4 PP1 Fngrgs 0 0 0 0 CB607 852 M -7 0 1 0 6 0 0 0 4 PP1 Fngrgs 0 0 0 0 CB605 851 M -8 0 1 1 7 0 0 -1 4 PP1 Fngrgs 0 0 0 0 CB617 851 M -9 0 0 1 8 0 1 -1 4 PP1 Fngrgs 0 0 0 0 CB619 849 M -7 0 0 1 7 0 0 -1 4 PP1 Fngrgs 0 0 0 0 CB605 849 M -7 0 1 1 6 0 0 -1 4 PP1 Fngr32 0 0 19 19 0 0 0 17 /Times-Bold /font41 ANSIFont fontgs 1469 588 459 237 CB1097 844 7 (I) 10 SB1107 844 13 (B) 17 SB1124 844 18 (M) 25 SB1149 844 5 ( ) 7 SB1156 844 14 (C) 19 SB1175 844 10 (o) 13 SB1188 844 10 (n) 15 SB1203 844 6 (f) 8 SB1211 844 5 (i) 8 SB1219 844 10 (d) 15 SB1234 844 9 (e) 11 SB1245 844 10 (n) 15 SB1260 844 6 (t) 9 SB1269 844 5 (i) 7 SB1276 844 10 (a) 13 SB1289 844 5 (l) 7 SBgr145 145 145 pC0 1 SP145 145 145 fCgs 0 0 0 0 CB574 161 M -271 0 -1 0 -1 -1 1 -1 23 -8 -994 0 0 -3 1001 0 2 1 -1 2 -23 8 264 0 0 2 13 PP0 FSngr0 0 255 pC0 0 255 fCgs 0 0 0 0 CB574 150 M -271 0 -2 -1 -2 -1 1 -2 1 -1 16 -6 -984 0 0 -5 999 0 3 1 1 2 -2 2 -16 6 256 0 0 5 15 PP0 FSngr32 0 0 49 49 0 0 0 45 /Helvetica-Bold /font19 ANSIFont font0 0 0 fCgs 1469 588 459 237 CB610 92 35 (D) 48 SB658 92 30 (L) 42 SB700 92 33 (S) 45 SB745 92 14 ( ) 19 SB764 92 33 (S) 45 SB809 92 27 (y) 38 SB847 92 27 (s) 38 SB885 92 16 (t) 22 SB907 92 27 (e) 38 SB945 92 43 (m) 60 SB1005 92 14 ( ) 19 SB1024 92 35 (D) 49 SB1073 92 14 (i) 19 SB1092 92 27 (a) 38 SB1130 92 30 (g) 41 SB1171 92 19 (r) 27 SB1198 92 27 (a) 37 SB1235 92 43 (m) 60 SBgr32 0 0 27 27 1 0 0 25 /Helvetica-Bold /font19 ANSIFont fontgs 1469 588 459 237 CB1455 296 18 (S) 25 SB1480 296 21 (w) 29 SB1509 296 8 (i) 10 SB1519 296 9 (t) 13 SB1532 296 15 (c) 21 SB1553 296 17 (h) 23 SB1576 296 9 (-) 12 SB1588 296 9 (t) 13 SB1601 296 17 (o) 23 SB1624 296 9 (-) 13 SB1637 296 18 (S) 25 SB1662 296 21 (w) 29 SB1691 296 8 (i) 11 SB1702 296 9 (t) 12 SB1714 296 15 (c) 21 SB1735 296 17 (h) 23 SBgr32 0 0 27 27 1 0 0 25 /Helvetica-Bold /font19 ANSIFont fontgs 1469 588 459 237 CB1475 325 18 (P) 25 SB1500 325 11 (r) 14 SB1514 325 17 (o) 23 SB1537 325 9 (t) 13 SB1550 325 17 (o) 23 SB1573 325 15 (c) 21 SB1594 325 17 (o) 23 SB1617 325 8 (l) 10 SB1627 325 8 ( ) 11 SB1638 325 9 (\() 12 SB1650 325 18 (S) 25 SB1675 325 18 (S) 26 SB1701 325 18 (P) 25 SB1726 325 9 (\)) 12 SBgr0 0 0 pC6 2 SPgs 393 166 1380 384 CB967 465 M 1238 0 1 PPSngrgs 393 166 1380 384 CB967 468 M 1238 0 1 PPSngr1793 467 M 39 -8 0 17 -39 -9 3 PP1 Fn32 0 0 25 25 0 0 0 24 /Helvetica-Bold /font19 ANSIFont fontgs 1469 588 459 237 CB1428 428 17 (S) 22 SB1450 428 14 (e) 19 SB1469 428 15 (n) 21 SB1490 428 15 (d) 20 SB1510 428 7 ( ) 10 SB1520 428 17 (S) 22 SB1542 428 17 (S) 23 SB1565 428 17 (P) 23 SB1588 428 7 ( ) 9 SB1597 428 15 (F) 21 SB1618 428 10 (r) 13 SB1631 428 14 (a) 19 SB1650 428 21 (m) 30 SB1680 428 14 (e) 19 SBgr6 2 SPgs 392 166 1397 500 CB967 581 M 1230 0 1 PPSngrgs 392 166 1397 500 CB967 584 M 1230 0 1 PPSngr1377 583 M -39 9 0 -17 39 8 3 PP1 Fn32 0 0 25 25 0 0 0 24 /Helvetica-Bold /font19 ANSIFont fontgs 1469 588 459 237 CB1445 543 18 (R) 24 SB1469 543 14 (e) 19 SB1488 543 14 (c) 19 SB1507 543 14 (e) 19 SB1526 543 7 (i) 9 SB1535 543 15 (v) 19 SB1554 543 14 (e) 19 SB1573 543 7 ( ) 9 SB1582 543 17 (S) 23 SB1605 543 17 (S) 22 SB1627 543 17 (P) 23 SB1650 543 7 ( ) 10 SB1660 543 15 (F) 20 SB1680 543 10 (r) 13 SB1693 543 14 (a) 19 SB1712 543 21 (m) 30 SB1742 543 14 (e) 19 SBgrgs 10 490 1368 294 CB781 498 597 294 B1 Fngrgs 781 8 597 784 CB781 498 597 294 B1 Fngr0 lc0 lj6 2 SP255 255 255 fC779 495 587 287 B1 FSn253 227 186 fC237 397 1098 332 B1 FSn32 0 0 25 25 0 0 0 24 /Helvetica-Bold /font19 ANSIFont font0 0 0 fCgs 1469 588 459 237 CB1140 500 18 (D) 24 SB1164 500 14 (a) 19 SB1183 500 8 (t) 11 SB1194 500 14 (a) 19 SB1213 500 7 ( ) 9 SB1222 500 15 (L) 21 SB1243 500 7 (i) 10 SB1253 500 15 (n) 20 SB1273 500 14 (k) 19 SBgr32 0 0 25 25 0 0 0 24 /Helvetica-Bold /font19 ANSIFont fontgs 1469 588 459 237 CB1161 526 17 (S) 22 SB1183 526 19 (w) 26 SB1209 526 7 (i) 10 SB1219 526 8 (t) 11 SB1230 526 14 (c) 19 SB1249 526 15 (h) 21 SBgr253 227 186 fC228 181 615 330 B1 FSn32 0 0 25 25 0 0 0 24 /Helvetica-Bold /font19 ANSIFont font0 0 0 fCgs 1469 588 459 237 CB652 376 18 (D) 24 SB676 376 14 (a) 19 SB695 376 8 (t) 11 SB706 376 14 (a) 19 SB
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