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Ideally, the algorithm would classify every conversation that is sharing the wire so that each conversation receives its fair share of the bandwidth. Unfortunately, with such protocols as SNA, you cannot distinguish one SNA session from another. For example, in DLSw+, SNA traffic is multiplexed onto a single TCP session. Similarly in APPN, SNA sessions are multiplexed onto a single LLC2 session. The weighted fair queuing algorithm treats these sessions as a single conversation. If you have many TCP sessions, the TCP sessions get the majority of the bandwidth and the SNA traffic gets the minimum.

Tunneling provides a means for encapsulating packets inside a routable protocol via virtual interfaces. Synchronous Data Link Control (SDLC) transport is also an encapsulation of packets in a routable protocol. In addition, transport provides enhancements to tunneling, such as local data-link layer termination, broadcast avoidance, media conversion, and other scalability optimizations. htm (11 of 35) [12/13/2000 8:54:24 PM] Internetworking Design Basics DLSw+ with TCP/IP encapsulation ❍ DLSw+ with Fast Sequenced Transport/Internet Protocol (FST/IP) encapsulation ❍ DLSw+ with DLSw Lite (Logical Link Control Type 2 [LLC2]) encapsulation Generic Routing Encapsulation (GRE) Cisco supports encapsulating Novell Internetwork Packet Exchange (IPX), Internet Protocol (IP), Connectionless Network Protocol (CLNP), AppleTalk, DECnet Phase IV, Xerox Network Systems (XNS), Banyan Virtual Network System (VINES), and Apollo packets for transport over IP Single-protocol tunneling techniques: Cayman (AppleTalk over IP), AURP (AppleTalk over IP), EON (CLNP over IP), and NOS (IP over IP) ❍ ● ● The following discussion focuses on IBM encapsulations and the multiprotocol GRE tunneling feature.

If every client is allocated the same bandwidth independent of the arrival rates, the low volume traffic has effective priority over high volume traffic. The use of weighting allows time-delay-sensitive traffic to obtain additional bandwidth, thus consistent response time is guaranteed under heavy traffic. There are different types of data stream converging on a wire, as shown in Figure 2-7. Figure 2-7: Weighted fair queuing. htm (9 of 35) [12/13/2000 8:54:24 PM] Internetworking Design Basics Both C and E are FTP sessions, and they are high-volume traffic.

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