barcode excel 2013 download Figure 5-23: Using DLSw to connect an SDLC controller to a remote token ring in Software

Printing EAN-13 in Software Figure 5-23: Using DLSw to connect an SDLC controller to a remote token ring

Figure 5-23: Using DLSw to connect an SDLC controller to a remote token ring
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Let's discuss the configuration commands implemented one by one Command source-bridge ring-group 1000 defines a DLSw router group Routers will establish DLSw connections only with other routers in the same ring group Command dlsw local-peer peer-id 180411 enables DLSw on the router and gives the router a DLSw ID, which is taken from the loopback address defined, just as was done for STUN in the previous section Command dlsw remote-peer 1000 tcp 180432 identifies a remote peer with which to exchange DLSw information using TCP In this command, the 1000 value is the ring-group number and must match that set by the source-bridge ring-group command Command sdlc vmac 123431740000 sets a MAC address for the serial port connecting to the SDLC controller This is a necessary part of enabling the link-level addressing for DLSw, enabling complete source-to-destination addressing using link-level addresses Command sdlc role primary sets this end of the link as the primary In command sdlc xid 06 12345, XID requests and responses are exchanged prior to a link between the router and the controller reaching an up state The XID is derived from parameters set in VTAM and must be determined by the IBM administrator Command sdlc partner 123456789abc 06 defines the MAC address of the token ring on
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the remote router that will be communicated with, and the SDLC ID number of the link connecting the two DLSw routers together Command sdlc dlsw 5 associates the DLSw and SDLC processes, so that DLSw will switch SDLC ID 5 traffic Command source-bridge 5 4 1000 enables source routing for the token ring attached to router 2 and defines the token ring as ring number 5, router 2 as bridge number 4, and the destination ring as number 1000 Command bridge 8 protocol ibm defines the spanning tree algorithm for this router and associates it with an ID of 8 Command source-bridge spanning 8 identifies all the Token-Ring ports that will participate in defining the spanning tree for the Token-Ring side of the network As you can see, this type of configuration is not trivial and takes significant cooperation between IBM data center staff and those responsible for Cisco router management
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Windows NT has the fastest-growing market share of any network operating system (NOS) currently in the market It seems that Microsoft has finally produced a NOS with which to challenge the leadership position of Novell's NetWare NT bases much of its LAN communication on NetBEUI, the NetBIOS Extended User Interface, which is a legacy from Microsoft's LAN Manager and IBM's PC LAN products NT, however, has built into the operating system the ability to interface to IPX/SPX, TCP/IP, and DLC (Data Link Control) I will not go into the details of setting up these protocols using Windows NT utilities; there are plenty of Microsoft manuals and Microsoft Press publications to do that for you What will be covered here is an overview of what NT servers use to communicate network information, and what the options and issues are for interconnecting NT servers and workstations over a WAN
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In this section we will examine the transport protocols of Windows NT, which are NetBEUI, NWLink, TCP/IP, and DLC NetBEUI NetBEUI originally was designed for small LANs of around 20 to 100 workstations As such, it was not designed with any concept of network numbers and is therefore a nonroutable protocol Windows implements NetBEUI 30, which uses the NetBEUI Frame (NBF) protocol that is based on the NetBIOS frame type and therefore is compatible with previous versions of NetBEUI In communications based on NetBIOS, computers are referred to by name rather than address Packets on the local segment are still delivered by MAC address, with each station on the network maintaining a computer-name-to-MAC-address translation On a single LAN segment, NetBIOS communications deliver better performance than a routable protocol because the communication process is simpler These days, however, there are very few networks installed that only ever need to connect to fewer then 100 other computers Recognizing the problems of NetBEUI in larger environments, Microsoft chose TCP/IP as its strategic WAN protocol for Windows NT implementations NWLink NWLink is the native Windows NT protocol for Novell's IPX/SPX protocol suite NWLink provides the same functionality that IPXCOM or IPXODICOM files did for a machine using the Open Data Link Interface (ODI) specification, namely the ability to use IPX as a transport protocol To connect to a NetWare server requires the use of VLM programs for an ODI machine, or the Client Services for NetWare (CSNW) redirector for Windows NT NWLink is useful if you have a mixed environment of NT and NetWare servers and need an NT machine to communicate with both TCP/IP In the Windows NT world, TCP/IP is used as a transport protocol, primarily for WAN connections Later in this section we will be discussing functions of the NT server that generate network traffic, most of which can be encapsulated within TCP/IP This is useful for minimizing the number of protocols that need to be supported on the WAN, but can be an issue if the encapsulated NetBEUI traffic starts to reach significant levels We will discuss this later The NT implementation for TCP/IP includes SNMP and DHCP support, as well as the Windows I t tN S i (WINS) hi h i t i t ld t b f t t IP
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Internet Name Service (WINS), which maintains a central database of computer-name-to-IPaddress translations NetBT, which stands for NetBIOS over TCP/IP, also is supported by NT for NetBIOS communication with remote machines via encapsulation in TCP/IP Data Link Control An important difference between DLC and the other protocols supported by Windows NT is that DLC is not meant to be used as a primary means of workstation-to-server communication That's because DLC does not have a NetBIOS interface Even when other protocols such as TCP/IP are used for workstation-to-server communications, a NetBIOS interface is needed to encapsulate NetBIOS traffic within this other protocol, just as NT computers need to pass NetBEUI among themselves to function The DLC protocol needs to be implemented only on machines that either access IBM mainframes using certain emulation packages, or print to some older types of Hewlett-Packard printers
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