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IBM BC-203 - page 1
BC-203 Cisco IOS Bridging and IBM Ne tworking Configuration Guide Overview of IBM Networking The IBM networkin g technologies described in this pub lication can be categorized as netw ork-relat ed or host-related technol ogies. The IBM Netwo rking section of the Cisco IO S Bridging and IBM Networkin g Configuration Guide discusses the follo wing ne ...
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IBM BC-203 - page 2
Overview o f IBM Networ king RSRB BC-204 Cisco IOS Bridging and IBM Ne tworking Configuration Guide Note All commands supported on the Cisco 7500 series router s are also supported on the Cisco 7000 s eries routers . RSRB In contrast to Source-Ro ute Bridging (SRB), whic h in volv es bridging between T oken Ring media only , RSRB is Cisco’ s firs ...
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IBM BC-203 - page 3
Overview of IBM Ne tworking RSRB BC-205 Cisco IOS Bridging and IBM Networking Con figuration Guide Configuration Considerations Use IP encapsulation only o ver a TCP co nnection within comple x meshed netw orks to support connections between peers that are separated by multiple hops and can potentially use multiple paths, and where performance is n ...
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IBM BC-203 - page 4
Overview o f IBM Networ king DLSw+ BC-206 Cisco IOS Bridging and IBM Ne tworking Configuration Guide Note As previously stated, local ac kno wledgment for LLC2 is meant only for e xtreme cases in which communication is no t possible otherwise. Because t he router must maintain a ful l LLC2 session, the number of si multaneous sessions it can suppor ...
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IBM BC-203 - page 5
Overview of IBM Ne tworking DLSw+ BC-207 Cisco IOS Bridging and IBM Networking Con figuration Guide This section contains a b rief ov ervie w of DLSw+ which is described in th e follo wing topics: • DLSw Standard , page 207 • DLSw V ersion 2 Stand ard, page 207 • DLSw+ Features, page 208 DLSw Standard The DLSw standard, documented in RFC 1795 ...
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IBM BC-203 - page 6
Overview o f IBM Networ king DLSw+ BC-208 Cisco IOS Bridging and IBM Ne tworking Configuration Guide IP Multicast Multicast service av oids duplication and excessi ve bandw idth of broadcast traff ic because it replicates and propagates messag es to its multicast members only as necessary . It reduces the amount of network ov erhead in the foll o w ...
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IBM BC-203 - page 7
Overview of IBM Ne tworking DLSw+ BC-209 Cisco IOS Bridging and IBM Networking Con figuration Guide This section contains inf ormation on the follo wing topics related t o DLSw+ features: • Local Ackno wledgment, page 209 • Notes on Using LLC2 Local Ackn ow ledgment, page 211 • DLSw+ Support fo r Other SNA Features, page 212 DLSw+ is fully co ...
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IBM BC-203 - page 8
Overview o f IBM Networ king DLSw+ BC-210 Cisco IOS Bridging and IBM Ne tworking Configuration Guide Figure 86 illustrates an LLC2 session in which a 37x5 on a LAN segment co mmunicates with a 3x74 on a dif ferent LAN segment separated via a wide-area b ackbone network. Frames are transported between Router A and Rout er B b y means of DLSw+. Ho we ...
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IBM BC-203 - page 9
Overview of IBM Ne tworking DLSw+ BC-211 Cisco IOS Bridging and IBM Networking Con figuration Guide 3x74 operates as if the ackno wledgments it receiv es are from the 37x5. Router B looks like the 3x74 to 37x5. Because the frames do n ot hav e to tra v el th e W AN backbone networks to be ackno wledged, b ut are locally ackno wled ged by r outers, ...
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IBM BC-203 - page 10
Overview o f IBM Networ king DLSw+ BC-212 Cisco IOS Bridging and IBM Ne tworking Configuration Guide If you are using NetBIOS applications, note that th ere are two NetBIOS timers—one at th e link le v el and one at th e nex t higher le vel. Local ackno wledg me nt for LLC2 is designed t o solve link timeouts only . If you are e xperienci ng NetB ...
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IBM BC-203 - page 11
Overview of IBM Ne tworking STUN and BSTUN BC-213 Cisco IOS Bridging and IBM Networking Con figuration Guide Figure 88 VDLC Int eraction with Higher -Lay er Prot ocols The higher -layer protocols mak e no distinction betw een the VDLC and an y other data-link control , but they do identify the VDLC as a d estination . In th e example sho wn in , SN ...
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IBM BC-203 - page 12
Overview o f IBM Networ king STUN and BSTUN BC-214 Cisco IOS Bridging and IBM Ne tworking Configuration Guide Figure 89 Compar ison of STUN in P assthr ough Mode and Local Ac knowledgment Mode Note T o enable STUN local ackno wledgment, yo u f irst enable the routers for STUN and confi gure them to appear on the netw ork as primary or second ary SD ...
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IBM BC-203 - page 13
Overview of IBM Ne tworking STUN and BSTUN BC-215 Cisco IOS Bridging and IBM Networking Con figuration Guide • Allo ws networks with IBM main frames and communi cations controllers to share data using Cisco routers and exi sting network links. As an SDLC function, STUN fu lly supports the IBM SN A and allo ws IBM SDLC frames to be transmitted acr ...
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IBM BC-203 - page 14
Overview o f IBM Networ king STUN and BSTUN BC-216 Cisco IOS Bridging and IBM Ne tworking Configuration Guide Figure 90 IBM Networ k Configuration without STUN and with STUN IBM mainframe Workstation T1 serial link Ethernet Workstation IBM 3x78 terminals Ethernet Local site Remote site Local site Remote site IBM 3x78 terminals S2075 3x74 37x5 3x74 ...
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IBM BC-203 - page 15
Overview of IBM Ne tworking LLC2 and SDLC Parameters BC-217 Cisco IOS Bridging and IBM Networking Con figuration Guide BSTUN Networks The Bisync feature enables your Cisco 2500, 360 0, 4000, 4500, 470 0, and 7200 series r outer to support devices that use the Bisyn c data-link prot ocol. This pro tocol enables ent erprises to transp ort Bisync traf ...
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IBM BC-203 - page 16
Overview o f IBM Networ king LLC2 and SDLC Paramete rs BC-218 Cisco IOS Bridging and IBM Ne tworking Configuration Guide LLC2 and SDLC pa ckage data in frames. LLC2 and SDLC stations require acknowledgments from receiving stations after a set amount of frames have been sent before send ing further data. The task s described in this ch apter modify ...
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IBM BC-203 - page 17
Overview of IBM Ne tworking IBM Network Media Tran slation BC-219 Cisco IOS Bridging and IBM Networking Con figuration Guide Cisco’s Implementation of SDLC Cisco’ s SDLC implementation supports the follo wing features: • Frame Relay Access Support (FRAS) W ith FRAS, a router functions as a Frame Relay Access Device (FRAD) for SDLC, T oken Rin ...
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IBM BC-203 - page 18
Overview o f IBM Networ king IBM Network Media Translation BC-220 Cisco IOS Bridging and IBM Ne tworking Configuration Guide Figure 91 SNA D ata Link Lay er Support SDLLC Media Translation Features T h e S D L L C f e a t u r e a l l o w s a P U 4 , P U 2 . 1 , o r P U 2 t o c o m m u n i c a t e w i t h a P U 2 S D L C d e v i c e a s f o l l o w ...
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IBM BC-203 - page 19
Overview of IBM Ne tworking IBM Network Media Tran slation BC-221 Cisco IOS Bridging and IBM Networking Con figuration Guide As part of its virtual telecommuni cations access method (VT AM) conf iguration , the IBM node on the T oken Ring has knowledge of the SDLLC VTRA of the serial de vice with which it communicates. The SDLC VTRA and the S DLLC ...
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IBM BC-203 - page 20
Overview o f IBM Networ king IBM Network Media Translation BC-222 Cisco IOS Bridging and IBM Ne tworking Configuration Guide QLLC Conversion Qualif ied Logical Li nk Control (QLLC) is a data link protocol def ined by IBM that allo ws SN A data to be transported acro ss X.25 network s. (Although IBM has def ined oth er protocols for transporting SN ...
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IBM BC-203 - page 21
Overview of IBM Ne tworking IBM Network Media Tran slation BC-223 Cisco IOS Bridging and IBM Networking Con figuration Guide Figur e 95 QLLC Conv ersion Running on a Ro ut er with an Inter mediate IP Networ k Cisco’s Implementation of QLLC Conversion SN A uses QLLC and X.25 as link layer proto cols to provide a reliable co nnection. QLLC itself p ...
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IBM BC-203 - page 22
Overview o f IBM Networ king IBM Network Media Translation BC-224 Cisco IOS Bridging and IBM Ne tworking Configuration Guide As Figure 97 sho ws, a router need not dir ectly connect the tw o IBM end nodes; instead, some ty pe of backbone W AN can connect them. Here, RSRB tran sports packets betw een Router A and Router B, while Rout er B performs a ...
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IBM BC-203 - page 23
Overview of IBM Ne tworking IBM Network Media Tran slation BC-225 Cisco IOS Bridging and IBM Networking Con figuration Guide circuits (PVCs) are av ailable, b ut the fa v ored us e is SVC. While the router maintains a permanent connection to the X.25 network, a remote device ca n use each SVC for some bounded period of time and then relinquish it f ...
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IBM BC-203 - page 24
Overview o f IBM Networ king SNA FRAS BC-226 Cisco IOS Bridging and IBM Ne tworking Configuration Guide SNA FRAS Using Frame Relay Access Support (FR AS), the Cisco IOS software allows branch SN A devices to connect directly to a cent ral site front-end pro ce ssor ov er a Frame Relay network. FRAS con verts LAN or Synchronous Da ta-Link C ontrol ( ...
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IBM BC-203 - page 25
Overview of IBM Ne tworking SNA FRAS BC-227 Cisco IOS Bridging and IBM Networking Con figuration Guide Figure 99 SNA BNN Suppor t f or Fr ame Relay The frame format that communicat es across the Frame Relay BNN link is defined in RFC 1490 for routed SN A traf f ic. From the perspecti ve of the SN A host (for e xample an NCP or AS/400), the Frame Re ...
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IBM BC-203 - page 26
Overview o f IBM Networ king NCIA BC-228 Cisco IOS Bridging and IBM Ne tworking Configuration Guide Figure 1 0 0 RFC 1490 Br idged F r ame For mat Because it includes the MA C header information in ev ery frame, B AN supports multiple SN A de vices sharing a single permanent virtual circuit without requiring SA P multiple xing. B AN also sup ports ...
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IBM BC-203 - page 27
Overview of IBM Ne tworking NCIA BC-229 Cisco IOS Bridging and IBM Networking Con figuration Guide NCIA I Cisco’ s NCIA server feature implements RFC 2114, Data Link Switch Client A ccess Protocol. U sing Cisco’ s R SRB technol ogy , NCIA I en capsulates the T oken Ring traff ic inside IP datagrams passed over a TCP connection between a router ...
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IBM BC-203 - page 28
Overview o f IBM Networ king NCIA BC-230 Cisco IOS Bridging and IBM Ne tworking Configuration Guide Figur e 1 0 1 NCIA Server Cl ient/Serv er Model NCIA Data Link Control (NDLC) is the proto col us ed between clients and servers. NDLC serves two purposes: • Establishes the peer connection • Establishes the circuit between th e client and the se ...
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IBM BC-203 - page 29
Overview of IBM Ne tworking NCIA BC-231 Cisco IOS Bridging and IBM Networking Con figuration Guide Advantages of the Client/Server Model The client/serv er model used in the NCIA Server feat ure e xtends the scalability of NCIA. In ad dition, it provides support for both the installed base of RSRB ro uters and the gro wing number of D LSw+ routers. ...
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IBM BC-203 - page 30
Overview o f IBM Networ king ALPS BC-232 Cisco IOS Bridging and IBM Ne tworking Configuration Guide Figure 1 03 NCIA Server Pro vides Independe nce from the Upstr eam Networ k Imp lementation ALPS The Airline Product Set (ALPS) is a tunneling mechanism that transpor ts airline protocol data across a TCP/IP network to a mainframe. ALPS pro vides co ...
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IBM BC-203 - page 31
Overview of IBM Ne tworking DSPU and SNA Service Point BC-233 Cisco IOS Bridging and IBM Networking Con figuration Guide Figur e 1 04 ALPS Ar c hitect ur e Cisco’ s ALPS feature provides an end-to -end solution for ai rlines and central reserv ation systems.The ALPS feature is integrated in th e Cisco IOS software and allo ws ai rlines to replace ...
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IBM BC-203 - page 32
Overview o f IBM Networ king DSPU and SNA Service Point BC-234 Cisco IOS Bridging and IBM Ne tworking Configuration Guide Figure 1 05 Router Acting as a DSPU Concentrat or T ypically , a router establishes one or more upstream co nnections with one or more hosts and m any do wnstream connections w ith PU type 2 de vices. From an SN A perspecti ve, ...
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IBM BC-203 - page 33
Overview of IBM Ne tworking SNA Switch ing Service s BC-235 Cisco IOS Bridging and IBM Networking Con figuration Guide SNA Switching Services Note SN A Switching Services functionality su persedes all functionality pre viou sly av ailable in the APPN feature in the Cisco IOS software . SN ASw conf iguration will not accept the pre vious APPN conf i ...
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IBM BC-203 - page 34
Overview o f IBM Networ king Benefits of SNASw BC-236 Cisco IOS Bridging and IBM Ne tworking Configuration Guide Scalable APPN Networks W ith the Br anch Extender (BEX) functio n, the numbe r of netw ork nodes and the amo unt of broadcast traf f ic are reduced. IP Infrastructure Support Limiting SN ASw routers to t he data center and u sin g the BE ...
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IBM BC-203 - page 35
Overview of IBM Ne tworking HPR Capable SNA Routing Service s BC-237 Cisco IOS Bridging and IBM Networking Con figuration Guide HPR Capable SNA Routing Services SN ASw pro vides the fol lo wing SN A routing functions: • Routes SN A sessions between clien ts and target SN A data hosts. • Supports full SN A class of service (COS) features. • Co ...
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IBM BC-203 - page 36
Overview o f IBM Networ king Enterprise Extender (HPR/IP) BC-238 Cisco IOS Bridging and IBM Ne tworking Configuration Guide Figure 1 07 BX Functional ity Enterprise Extender (HPR/IP) SN ASw also supports the EE functio n. EE of fers SN A HPR suppo rt directly o ver IP networks. EE also uses connectionless User Datagram Protocol (UD P) transport. SN ...
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IBM BC-203 - page 37
Overview of IBM Ne tworking Usability Features BC-239 Cisco IOS Bridging and IBM Networking Con figuration Guide Usability Features SN ASw contains the fol lo wing usability features desi gned to make SN A networks easier to design an d maintain: • Dynamic CP Name Generation Support, page 239 • Dynamic SN A BTU Size, page 23 9 • DLUR Connect ...
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IBM BC-203 - page 38
Overview o f IBM Networ king Management Enhanc ements BC-240 Cisco IOS Bridging and IBM Ne tworking Configuration Guide Responsive Mode Adaptive Rate-Based Flow Control Early HPR implementations fai led to perform well in en vironments subject to packet loss (for exampl e, Frame Relay , IP transport) and performed p oorly wh en combi ned with other ...
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IBM BC-203 - page 39
Overview of IBM Ne tworking LAN and IP-Focused Con nection Types BC-241 Cisco IOS Bridging and IBM Networking Con figuration Guide Trap MIB Support for Advanced Network Management Awareness SN ASw supports the APPN T rap MIB, which proactiv ely sends traps with informati on about changes in SN A resource status. This implementation reduces th e fre ...
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IBM BC-203 - page 40
Overview o f IBM Networ king Cisco Transaction Conn ection BC-242 Cisco IOS Bridging and IBM Ne tworking Configuration Guide Connection to Channel Interface Processor and Channel Port Adapter V irtual T oken Ring an d SRB can be used to connec t SNASw to the Channel Interf ace Processor (CIP) or Channel Port Adapter ( CP A) in routers that support ...
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IBM BC-203 - page 41
Overview of IBM Ne tworking Cisco Transaction Connection BC-243 Cisco IOS Bridging and IBM Networking Con figuration Guide • CTRC supports the ability to conf igure routes for CI CS transaction. Each tr ansac tion can be routed to a specific CICS region. • In addition to its CICS- related functionality , CTRC includes the feature previously kno ...
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IBM BC-203 - page 42
Overview o f IBM Networ king Cisco Transaction Conn ection BC-244 Cisco IOS Bridging and IBM Ne tworking Configuration Guide Figure 1 09 Cisco Router Configured with the CTRC Feat ur e for CICS Communications CTRC and DB2 CTRC enables Cisco routers to implement IBM ’ s D RD A ov er TCP/IP . The Cisco router with CTRC exists in the TCP/IP network, ...
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IBM BC-203 - page 43
Overview of IBM Ne tworking CMCC Adapter Hardware BC-245 Cisco IOS Bridging and IBM Networking Con figuration Guide For a TCP/IP host connection, th e router with CTRC routes the DRD A packets ov er TCP/IP without protocol changes. T o use this TCP/IP passthrough feature of CTRC, th e host database v ersion must support direct TCP/IP access. Figure ...
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IBM BC-203 - page 44
Overview o f IBM Networ king CMCC Adapte r Hardware BC-246 Cisco IOS Bridging and IBM Ne tworking Configuration Guide Figur e 1 12 Cisco Mainframe Channel Connection Adapt ers Channel Interface Processor The CIP for the Cisco 7000 with RSP70 00 and Cisco 7500 series routers is d esigned for high-end network en vironments that demand hi gh-performan ...
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IBM BC-203 - page 45
Overview of IBM Ne tworking CMCC Adapter Hardware BC-247 Cisco IOS Bridging and IBM Networking Con figuration Guide The Cisco 7200 series rout er supports online in sert ion and remo v al (OIR), which allo ws you to inst all or remov e port adap ters while the system is operatin g. Note In this chapter , refe rences to Channel Port Adapter (CP A) c ...
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IBM BC-203 - page 46
Overview o f IBM Networ king CMCC Adapter Features for TCP/IP Environments BC-248 Cisco IOS Bridging and IBM Ne tworking Configuration Guide Supported Environments The Cisco IOS software supports the f ollow ing en vironments and features on the CMCC adapters: • TCP/IP En vironments—CLA W , TCP/IP offload, IP host backup, CMPC+, a nd TN3270 ser ...
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IBM BC-203 - page 47
Overview of IBM Ne tworking CMCC Adapter Features for TC P/IP Environments BC-249 Cisco IOS Bridging and IBM Networking Con figuration Guide IP Host Backup Y ou can connect multiple mainfr ames to a single CM CC adapter using an ESCON director . Often, these mainframes run using the ESCON Multiple Image F acility (EMIF), which permits the ph ysical ...
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IBM BC-203 - page 48
Overview o f IBM Networ king CMCC Adapter Features for SNA Environments BC-250 Cisco IOS Bridging and IBM Ne tworking Configuration Guide CMCC Adapter Features for SNA Environments The Cisco IOS software supports the f ollo wing fe atures for CMCC adapters in SN A en vironments: • Cisco SN A, page 250 • Cisco Multipath Channel, page 251 • TN3 ...
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IBM BC-203 - page 49
Overview of IBM Ne tworking CMCC Adapter Features fo r SNA Environments BC-251 Cisco IOS Bridging and IBM Networking Con figuration Guide Cisco Multipath Channel CMPC is Cisco System’ s implementation of IBM’ s MultiPath Channel (MPC) feat ure on Cisco 7500, Cisco 7200, and Cisco 7000 wit h RSP7000 series routers. CMPC allo ws VT AM to establis ...
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IBM BC-203 - page 50
Overview o f IBM Networ king CMCC Adapter Features for SNA Environments BC-252 Cisco IOS Bridging and IBM Ne tworking Configuration Guide The TN3270 server feature of fers an attracti ve so lution when the follo wing conditions need to be supported in an SN A en vironment: • Maintaining an IP ba ckbone while pro viding su pport for SN A 32 70-typ ...
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IBM BC-203 - page 51
Overview of IBM Ne tworking CMCC Adapter Features fo r SNA Environments BC-253 Cisco IOS Bridging and IBM Networking Con figuration Guide Note T o enable the TN32 70 server feature, y ou must hav e a CMCC adapter installed in a Cisco 7000 with RSP7000, Cisco 7 500 series router , or a Cisco 7200 router . The TN3270 server is v ery dif ferent from t ...
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IBM BC-203 - page 52
Overview o f IBM Networ king CMCC Adapter Features for SNA Environments BC-254 Cisco IOS Bridging and IBM Ne tworking Configuration Guide ...
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