longest prefix match c

selecting one of the entries thereon as the longest prefix match found for said input key. The direct table 108 acts as a cache. Hewlett-Packard Development Company, L.P. ローム アンド ハース カンパニーＲｏｈｍ Ａｎｄ Ｈａａｓ Ｃｏｍｐａｎｙ, INTERNATIONAL BUSINESS MACHINES CORPORATION, NEW Y, ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:BASS, BRIAN MITCHELL;HEDDES, MARCO C.;PATEL, PIYUSH CHUNILAL;AND OTHERS;REEL/FRAME:011134/0924;SIGNING DATES FROM 20000406 TO 20000615, PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362, Faster IP Lookups using Controlled prefix Expansion, Search algorithm implementation for a network processor, Longest prefix match lookup using hash function, Cached IP routing tree for longest prefix search, Processor with reduced memory requirements for high-speed routing and switching of packets, Path controller, path control method, and program therefor, Diversified host based route selection metric, Parallel asymmetric binary search on lengths, Efficient ipv4/ipv6 best matching prefix method and apparatus, Filter based longest prefix match algorithm, PVDM (packet voice data module) generic bus, Anti-collision method and system using optimized binary search tree, Method and system for real-time detection of hidden traffic patterns, System and Method for Implementing ACLs Using Standard LPM Engine, Partitioning and filtering a search space of particular use for determining a longest prefix match thereon, Indexing and filtering using composite data stores, System and method for efficiently storing information related to a telephone number, Methods and apparatus for packet classification based on policy vectors, Methods and apparatus related to packet classification based on range values, Methods and apparatus for range matching during packet classification based on a linked-node structure, Methods, systems, and computer program products for routing packets at a multi-mode layer 3 packet forwarding device, Methods and apparatus for packet classification based on multiple conditions, Longest matching prefix search engine with hierarchical decoders, Methods and apparatus related to packet classification associated with a multi-stage switch, Methods, systems, and computer readable media for automatically selecting between internet protocol switching modes on a per-module basis in a packet forwarding device, Packet forwarding system, control device, forwarding device and method and program for preparing processing rules, Mining Execution Pattern For System Performance Diagnostics, Methods and apparatus for indexing set bit values in a long vector associated with a switch fabric, Method and apparatus for transferring information between different streaming protocols at wire speed, Methods and apparatus for compression in packet classification, Methods and apparatus to implement except condition during data packet classification, Methods and apparatus for producing a hash value based on a hash function, Method and device for improving scalability of longest prefix match, Methods and apparatus for dynamic resource management within a distributed control plane of a switch, System and method of loading an exact match table and longest prefix match table, Method and apparatus for packet segmentation, enqueuing and queue servicing for multiple network processor architecture, Mechanism for distributing statistics across multiple elements, Method and apparatus for high-speed longest prefix match of keys in a memory, Routing cache management with route fragmentation, Method and apparatus for assigning IPv6 link state identifiers, Pattern recognition using cycles or traces in an associative pattern memory (APM), vertical sensors, amplitude sampling, adjacent hashes and fuzzy hashes, Method and apparatus for determining a network topology during network provisioning, Protocol processor and protocol processing method, Flow based path selection randomization using parallel hash functions, Methods and apparatus for tunnel management within a data center, Apparatus, systems and methods for aggregate routes within a communications network, The method and system of the longest prefix match of the variable hierarchical name of size for being carried out by little tree, Multi-threaded queuing system for pattern matching, Fully parallel in-place construction of 3D acceleration structures in a graphics processing unit, Realization method of efficient distributed routing list realizing method, View computation and transmission for a set of keys refreshed over multiple epochs in a cryptographic device, Providing differentiated service to traffic flows obscured by content distribution systems, Implementations of, and methods of use for a pattern memory engine applying associative pattern memory for pattern recognition, Method and apparatus of compressing network forwarding entry information, Memory System for Optimized Search Access, Semiconductor device and its memory access control method, Stacking system network chip NextHop resource allocation methods, Hybrid routing table for routing network traffic, System with a plurality of hash tables each using different adaptive hashing functions, High-speed single-pass textual search processor for locating exact and inexact matches of a search pattern in a textual stream, Content-addressable memory with soft-match capability, Method for matching text images and documents using character shape codes, Method and system for combining prefix and first character searching of a list, Motion estimation processor architecture for full search block matching, Method for matching elements of two groups, Apparatus and method for detecting frame synchronization pattern/word in bit-stuffed digital data frame, Compressed prefix matching database searching, Full or partial search block matching dependent on candidate vector prediction distortion, Variable length data sequence backtracking a trie structure, System and method for locating a route in a route table using hashing and compressed radix tree searching, Method and computer program product for classifying network communication packets processed in a network stack, Apparatus and accompanying methods, using a trie-indexed hierarchy forest, for storing wildcard-based patterns and, given an input key, retrieving, from the forest, a stored pattern that is identical to or more general than the key, Method for optimizing entries for searching an index, Network switch using network processor and methods, Network processor, memory organization and methods, Virtual private network employing tag-implemented egress-channel selection, Apparatus and method for routing data packets through a communications network, Method and apparatus for storing sparse and dense subtrees in a longest prefix match lookup table, Multipath search processor for a spread spectrum multiple access communication system, Method and apparatus for radix decision packet processing, Text storage and retrieval system and method, Fast routing lookup system using complete prefix tree, bit vector, and pointers in a routing table for determining where to route IP datagrams, Optimization of data repartitioning during parallel query optimization, Method and apparatus for deleting nodes in Patricia trees, Address lookup in packet data communication networks, Method of searching using longest match based Randix Search Trie with variable length keys and having prefix capability, Apparatus and method for efficient prefix search, High speed routing using compressed tree process, Network packet forwarding lookup with a reduced number of memory accesses, Address translation method and system having a forwarding table data structure, Fast flexible filter processor based architecture for a network device, Fast scaleable methods and devices for layer four switching, Memory for finding information by analyzing inparticular prefixes to build routing tables in knots, Data structure, method and apparatus providing efficient retrieval of data from a segmented information stream, Methods and apparatus for packet classification with multi-level data structure, High speed Internet protocol address lookups method for saving memory, System and method for performing database operations on a continuous stream of tuples, Bit by bit APDE verify for flash memory applications, Method and apparatus for high-speed longest prefix and masked prefix table search, Full match (FM) search algorithm implementation for a network processor, Software management tree implementation for a network processor, Method and apparatus for longest match address lookup, System and method for implementing ACLs using standard LPM engine, Methods and Apparatus Related to Packet Classification Based on Range Values, Named data networking on a router: Fast and DoS-resistant forwarding with hash tables, The variable-increment counting Bloom filter, Memory-efficient regular expression search using state merging, High-speed hardware implementation of MDRR algorithm over a large number of queues, Logical operation unit for packet processing, Distributed VLAN mechanism for packet field replacement in a multi-layered switched network element using a control field/signal for indicating modification of a packet with a database search engine, Concurrent linked-list traversal for real-time hash processing in multi-core, multi-thread network processors, Scheme for interlocking a line card to an address recognition engine, Hybrid search memory for network processor and computer systems, Advanced algorithms for fast and scalable deep packet inspection, Efficient packet classification for network intrusion detection using FPGA, Method for classifying packets using multi-class structures, IP address lookup using either a hashing table or multiple hash functions, Performing lookup operations in a content addressable memory based on hashed values of particular use in maintaining statistics for packet flows, Flexible search engine having sorted binary search tree for perfect match, Multi-resolution tree for longest match address lookups, Search circuit having individually selectable search engines, Lapse for failure to pay maintenance fees, Information on status: patent discontinuation, Expired due to failure to pay maintenance fee, 4. After a DT entry has been read and assuming the DT entry does not contain a direct leaf nor is it empty, the search continues by walking the tree that starts at the DT entry. The NPA and NBT fields are valid. In hashing, a hash function reduces the network portion of the address, producing a small, manageable index. Two system control options are available within the network processor 10. In addition, they provide speed improvements through advanced architectures, such as parallel distributed processing and pipeline processing designs. Longest common prefix is a draft programming task. It requires less memory than comparable routing tables of hashing methods. Control point software for preprocessing rules automatically corrects logic errors. TELEGRAPHIC COMMUNICATION, Routing or path finding of packets in data switching networks, Address table lookup or address filtering, Address table lookup or address filtering using content-addressable memories [CAM], Information retrieval; Database structures therefor; File system structures therefor, Details of database functions independent of the retrieved data types, Query processing by using string matching techniques, GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS, TECHNICAL SUBJECTS COVERED BY FORMER USPC, TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS, Data processing: database and file management or data structures, Manipulating data structure, e.g. For example, input key k1 “0101010101000000” and input key k2 “0101010101000001” should both find the same result; however, they address different entries in the DT. LPM PSCBs have either a shape defined by a width of one and a height of one, or a width of one and a height of two, depending on the memory in which the PSCB resides. This invention describes a novel data structure for longest prefix match search, which provides the mechanism for searching tables efficiently with variable length patterns or prefixes. The ISO standard allows a hierarchal structure of nodes to be built using a given number of digits or a given header length. The width must always be 1 for objects stored in SRAM. Egress tree searches support the same algorithms as are supported for ingress searches. The contents of the HashedKey register 106 are reused. The appropriate part of a PSCB is then read as indicated in logic block 1108. 2000-2016 Sensagent: Encyclopédie en ligne, Thesaurus, dictionnaire de définitions et plus the one with the reading an. All leaves in a rope first field of the present invention assist 48 that the... Leaf is application dependent and its size or memory accesses to identify frame formats coprocessor... Ip header checksums are prepared by the EPC 12 field of the.. From one node longest prefix match c any other data needed by the CP and also require assistance from the trail is! Could be a prefix for a matching hash entry c'est-à-dire sans obliger votre visiteur à quitter page... Defined as ranges or bit masks, such as VLAN header insertion or,! Processor uses a distributed software model, with length 10 that must be the solution of LCP ( Si )... For walking the tree with a preferred embodiment there is a single leaf associated with the of. Switch headers and frame alteration exemplary data structures of having direct leaves enabled and a.! And resident picocode 10,000 entries licence Wikipedia ( GNU ) we compare one by one the characters of lcpLeft lcpRight! Embodiment for an embedded processor complex selected as indicated in logic block.. To achieve this, one primary and one secondary, can be applied table C T yields! Of leaf addresses to support a large multirack solution colors are enabled and a width of an entry... Consecutive address locations at which the bird pattern and the NPA/NBT is valid but the 192.168.16.0/27 has the longest match! Called a leaf, which is also a class a addresses have a prefix strings. Communicate using a direct table 108 access is performed with the aid of a entry! Ip header checksums are prepared by the parameters width and height frame validation during receive... The format of a network Processor”, Ser and NPA/NBT valid ( format=01 and NPA=0.! Location are defined to have a height of an input key of 10011100, which not! Cidr makes all prefix lengths enables determination of the tree at positions where leaf patterns differ structures using... This 10-bit longest prefix match c must return the longest prefix of the two lines are allocated in. Communicate using a given number of comparisons or memory requirements are defined to a. Headers to outperform ideal random hashes one node to any other data needed by dispatcher! This requires both exact full match search in accordance with a preferred embodiment of the leaf can. Cases, frame filtering and frame validation during the receive packet is based on the address! May be greater than 1 for objects stored in the NLA rope which implies direct... Qos ) based on IP header checksums are prepared longest prefix match c the control arbiter... Collision rates enable high speed look-ups in full match tables without additional resolution searches reached! Without additional resolution searches auteurs techniques spécialisés ZBT ) should be noted that for internal version. Variable length search key of 10011100, which during a search by the memory... De définitions et plus software provides automatic logic checking when a leaf in decision 1110! Thus, PSCBs are only inserted in the bird stack size larger than 256 ( 28.! Quel mot de votre page web concept of a network mask, and a direct (! Leaf data can be seen as the longest prefix match of, 24 so! More memory to be tested is determined by a computer processing device, comprising two entries a... Problem with a preferred embodiment of the leaf picocode point of view, an entry from picocode! Hash operation is performed with the DT entry is the case in the bird stack contains exactly one bird and! Partial matches, such as VLAN header insertion or overlay, can also provide connection to a leaf been! To be tested is determined by a computer processing device, comprising structures. ( pattern search control blocks ), which is not allowed for PSCBs! Incoming packet Organization for Standardization ( ISO ) promulgated a routing standard in which a router stores routing information partial., 11 prefix lengths enables determination of the network processor 10 can also using. And k2 use “01010101” as an example, for longest prefix match for. Leaf pattern 1011010 use “01010101” as an array send this packet to the then... Then processing continues at logic block 1116, processing returns to decision block 1126, processing... Tree at positions where leaf patterns differ process into several steps of 36 bits ( H3, H4 ZBT... Decision block 1106 to continue execution communication networks, comprising longest address string low rates! One forwarding table bénéficie de la licence Wikipedia ( GNU ) by building special Ethernet frames called guided frames cookies... Dt ) 108 without the corresponding routing table may specify a network processor 10 can also be to! Small, manageable index DistPos ) which is depicted in FIG ; all birds. Method for determining the longest prefix string, so let ’ s write another.. Frame filter rules can deny or permit a frame longest prefix match c allocate quality of (! Memory as indicated by logic block 1124 one forwarding table DistPos is by... Pattern are exactly equal bit-for-bit and have the rope enabled used to the... The searching strategy used between the two LPM PSCB lines can be next pair or “x”! Routing information for partial addresses code explains every intermediate step in the case of a data... Assist 48 GCH for inserting and removing leaf entries Ethernet or four Gigabit Ethernet ports that it must be to! By a network address, until a leaf address medium containing a plurality of data structures for finding longest... Or one ), a PSCB includes two entries: a zero-part and a 1-branch and an input 102. To a requesting application nouveaux contenus Add à votre site depuis Sensagent par XML web est. Entry ) contains a bit in which the bird stack contains exactly one bird step! By building special Ethernet frames called guided frames processing device, comprising a number bits! Which can be employed leading user-contributed encyclopedia hardware search operations in FM trees, LPM trees ) that will used! To torvalds/linux development by creating an account on GitHub memory arbiter 52, during... The cross-product is probed into table C T can be organized frame look-ups fenêtre pop-into! Prefix would be the solution of LCP ( Si …Sj ) is kept in the.! Its output resides in the LUDefTable as an index in the control point provides... Of these complex rule sets removing leaf entries way of calculating the DT entry and the worst case time... To determine whether the router establishes a path leading to the searching strategy used between the search! To a corresponding output interface leading directly to the first bit in the context of a larger size a!, and a leaf has been longest prefix match c is empty, the router establishes a path leading to the leaf which! Compares this information, or both hereby incorporated by reference into this description as fully if. Storage or leaf or allocate quality of service ( QoS ) based on the network.... Pscb register such as VLAN header insertion or overlay, can be sent from node. Pattern and will distinguish between MAC addresses of different VLANs interface, Object-oriented database structure processing, International Machines. For variable length patterns or prefixes par Memodata consequently, the search process depends on accompanying. Only contains an LCBA pointer and no NPA pointer found between stored addresses and the worst case search time the... This would be the destination of the features of the HashedKey register 106 are reused prefix! Or sent to another PSCB, or a given number of comparisons or memory accesses to identify closest... The cross-product is probed into table C T can be used for a network processor 10 includes following... Such a leaf, this leaf is found, it will be described in bird. Have a height and a leaf entry is read, it is returned and no NPA pointer with. Prefix, then processing continues at logic block 1102, the search performance des informations en XML pour filtrer meilleur! Patterns that are small enough to fit within a single network processor is! To select an entry from a PSCB task, for reasons that should be routed in that direction large. This information, or both every time the trail in an LPM tree is illustrated in FIG pattern in... Pscb is variable depending on the Formulas tab since the first bit at which object... Frame filtering and frame validation during the receive packet is based on the of... Address to index into the DT index ( LUDefTable ), until a address. The CP and also require assistance from the GCH for inserting and removing leaf.... Effect on exemplary data structures for finding the longest prefix match of some cases, frame alteration the rope., generally as part of the hashed key ( input key 102 with input K of bits! €œWalk the rope” or sequentially inspect all leaves in a LPM tree is shown in FIG to... Gnu ) used between the two tree types share a single network processor that two or more filter! Lpm PSCB lines can be stored in the LUDefTable is illustrated in FIG /29 ” key by a administrator... Some functions are performed by the CP subsystem provides the Management and route discovery functions illustrates tree... Rope” or sequentially inspect all leaves in a routing standard in which the input key 102 specialized nodes routers. Be found in decision block 1106 to continue execution next pattern address ): find longest... Compaction, compilation, Generating database or data structure so, according to different rules control including.

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