Piscitello, D. and C. Lawrence, "The Transmission of IP Datagrams over the SMDS Service", RFC 1209, March 1991.  Home/Search   Document Not in Database   Summary   Related Articles   Check

....point and click. C. Link layer Awareness One of the best qualities of the Internet Protocol is its support for a variety of link layers by providing a uniform interface at the network layer. Although not every link layer was designed for IP, IP works over every link layer [3] 5] 10] 14] [22], 24] 25] 26] 27] 29] This least common denominator approach loses link layer specific advantages; by restricting its expectations to simple datagram delivery, IP loses the richness of the individual link layers. Link layer awareness provides access to the capabilities of each link ....

D. Piscitello and J. Lawrence. Transmission of IP datagrams over the SMDS service. Request for Comments (Standard) RFC 1209, Internet Engineering Task Force, March 1991.

....data unit (SDU) used by IWUs to encapsulate connectionless data from private networks using the Network Layer Protocol ID (NLPID) 12] and the Sub Network Access Protocol (SNAP) 13] to identify higher layer protocols. The encapsulation method shown here is derived from encapsulations found in [14] [15], and [11] It is designed to allow the significant fields (e.g. addresses) of several possible encapsulated protocols (e.g. IP, ATM LAN) to be present in the first cell of a frame, allowing intermediate CLSs and or IWUs to optionally process cells based on higher layer protocol information. ....

D. Piscitello and J. Lawrence, "Transmission of IP datagrams over the SMDS Service," Network Information Center RFC 1209, pp. 1--11, March 1991.

....range of multicast solutions, just as each of the unicast routing protocols has its place in the Internet 1 . 1 Introduction Multicast communication is an increasingly important capability in many of today s data networks. Most LANs and more recent wide area network technologies such as SMDS [20] and ATM [10] specify multicast as part of their service. 1 Examples include: RIP, OSPF, IS IS, IGRP, EGP, BGP, etc. The multicast backbone, or MBONE [15] is a virtual network overlay of the IP Internet comprising hosts (acting as routers) and networks, with multicast capability. The ....

J. Lawrence and D. Piscitello. RFC 1209, The Transmission of IP Datagrams over the SMDS Service. SRI Network Information Center, March 1991.

....a fixed size unit especially when the bandwith allocated to the virtual data path is low. 1 The last cell is padded as necessary to meet the fixed size cell standard. 5 Effect of MTU Here we use as an example the 9180 byte MTU standard imposed when sending an IP packet over an ATM network [2, 8]. In this case, if the packet size is larger than 9180 bytes then fragmentation is needed. We assume that the data we need to send is carried in multiple packets, each of size greater than 9180 bytes. Define the following: ffl N p , number of packets of size greater than 9180 bytes to be sent ....

D. Piscitello and J. Lawrence. The transmission of IP datagrams over the SMDS service. Technical Report RFC-1209, March 1991.

....way across links with smaller MTUs. With this in mind, the Network Working Group is working on a new draft standard, at this stage called Default IP MTU for use over ATM AAL5 [8] The default MTU, which all IP over ATM nodes must support, is to be 9180 bytes (also the MTU for IP across SMDS [9]) The aim of RFC1483 is to develop a standard for carrying multiple protocols, of which IP is one. The IETF note two methods for supporting multiple protocols. Where dynamic and rapid creation of virtual connections is possible, each protocol may choose to open a virtual connection for its own ....

D. Piscitello, J. Lawrence, "The Transmission of IP Datagrams over the SMDS Service", RFC 1209, March 1991.

....than 3 pdus. The measurements based on the current environment c) proved an essential increase and enhancement of TCP IP throughput performance as shown in Fig. 6. Fig. 6. ATM TCP IP Throughput as a Function of Socket Buffer Size Fore SBA 200 Driver Version 2.2.6, mtu=9188 1. The SMDS Service [4] defines a maximum service data unit size of 9188 information octets. This leaves 9180 octets for user data after the LLC SNAP header is taken into account. Fore does no LLC SNAP encapsulation. Therefore, the MTU for IP stations operating over the network is 9188 octets (cf. 3] 5] 10 30 ....

D. Piscitello and C. Lawrence, The Transmission of IP Datagrams over the SMDS Service, RFC 1209, Bell Communications Research, March 1991.

....a CBT header. 55 4.2 Bytes of Storage Comparison of DVMRP and CBT Routers : 57 Chapter 1 Introduction Multicast communication is an increasingly important capability in many of today s data networks. Most LANs and more recent wide area network technologies such as SMDS [62] and ATM [23] specify multicast as part of their service. The multicast backbone, or MBONE [32] is a virtual network overlay of the IP Internet comprising hosts (acting as routers) and networks, with multicast capability. The benefits of multicast are becoming more apparent and are being ....

....of receivers (so called concast [81] are a considerable burden to a sender. For large groups this could also cause serious congestion problems at or near a sender. A heterogeneity of network types may pervade any layer of the Internet hierarchy, for example, X. 25 [17] Frame Relay [13] SMDS [62], ATM [61] Of these, only SMDS offers a connectionless service, and only X.25 is a network layer protocol. Unlike TCP IP networks, the routing function of Frame Relay, SMDS, and ATM is at the link layer. So, the question is: how do connection oriented networks support multicast In actual ....

J. Lawrence and D. Piscitello. RFC 1209, The Transmission of IP Datagrams over the SMDS Service. SRI Network Information Center, March 1991.

....of this size involved in reassembly could alone fill the entire reassembly buffer in a switch output queue. Atkinson (1994) gives an overview of other typical frame sizes being applied on AAL 5. These are 8 kilobytes used by the Network File System (NFS) and the 9180 bytes of IP MTU over SMDS (Piscitello and Lawrence 1991) that became the default value for IP MTU over ATM AAL 5 (Laubach 1994) These big packet sizes in conjunction with VC merging could induce present problems that VP merging would not encounter. On the other hand there will also be much more real time traffic (e.g. voice) in the Internet. Real time ....

Piscitello D. and Lawrence, J. (1991) The transmission of IP datagrams over the SMDS service. RFC 1209, March 1991.

....As we already pointed out in the description of Classical IP over ATM (see section 5.1.2) the address solving problem arises when the stations are in the same NBMA network, but not in the same LIS. In fact, in this scenario, classical address resolution as described in RFC1577 [20] and RFC1209 [30] does not work, because it can only discover a router that is a member of multiple LISs, and packets can hop several times through the NBMA network instead of using one single hop. NHRP solves this problem with the definition of an inter LIS address resolution mechanism, providing the source ....

RFC 1209: "Transmission of IP datagrams over the SMDS service" J. Lawrance and D. Piscitello, March 1991

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Piscitello, D. and C. Lawrence, "The Transmission of IP Datagrams over the SMDS Service", RFC 1209, March 1991.

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Piscitello D., and J. Lawrence, "Transmission of IP datagrams over the SMDS Service", RFC 1209, Bell Communications Research, March, 1991.

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Piscitello, D. and J. Lawrence, "The Transmission of IP Datagrams over the SMDS Service", RFC 1209, March 1991.

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Piscitello, D. and Lawrence, C., "The Transmission of IP Datagrams over the SMDS Service". RFC 1209, Bell Communications Research, March 1991.

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Piscitello, D., and J. Lawrence, "The Transmission of IP Datagrams over the SMDS Service", STD 52, RFC 1209, March 1991.

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Piscitello, D., and J. Lawrence, "The Transmission of IP Datagrams over the SMDS Service", RFC 1209, Bell Communications Research, March 1991.

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Piscitello,, D., and J. Lawrence, "Transmission of IP datagrams over the SMDS service", RFC 1209, March 1991.

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Lawrance, J., and D. Piscitello, "The Transmission of IP datagrams over the SMDS service", RFC 1209, March 1991.

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Piscitello, D., and J. Lawrence, "Transmission of IP Datagrams over the SMDS Service, RFC 1209, Bell Communications Research, March 1991.

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Piscitello, D., and J. Lawrence, "Transmission of IP Datagrams over the SMDS Service", RFC 1209, Bell Communications Research, March 1991.

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Piscitello, D., and J. Lawrence, Editors, The Transmission of IP Datagrams over the SMDS Service", RFC 1209, Bell Communications Research, March 1991.

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Piscitello, D., and J. Lawrence, "The Transmission of IP Datagrams over the SMDS Service", RFC 1209, Bell Communications Research, March 1991.

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Piscitello, D., and J. Lawrence, Editors, The Transmission of IP Datagrams over the SMDS Service", RFC 1209, Bell Communications Research, March 1991.

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Piscitello, D.; Lawrence, J.; "The Transmission of IP Datagrams over the SMDS Service," Draft RFC, Mar. 91

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D. Piscitello and J. Lawrence, The Transmission of IP Datagrams over SMDS Service, RFC 1209, Information Sciences Institute, March 1991.

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D. Piscitello and J. Lawrence, "The Transmission of IP Datagrams over the SMDS Service," RFC 1209, 1991.

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