User manual D-LINK DES-6500 Reference Guide

[. . . ] D-Link TM DES-6500 Modular Layer 3 Chassis-based Ethernet Switch Firmware Release 1. 4 Manual D-Link DES-6500 Gigabit Ethernet Switch ____________________ Information in this document is subject to change without notice. Reproduction in any manner whatsoever without the written permission of D-Link Corporation is strictly forbidden. Trademarks used in this text: D-Link, the D-LINK logo are trademarks of D-Link Computer Corporation; Microsoft and Windows are registered trademarks of Microsoft Corporation. Other trademarks and trade names may be used in this document to refer to either the entities claiming the marks and names or their products. [. . . ] From the link-state database, each router constructs a shortest path tree with itself as root. There are five types of link state advertisements, each using a common link state header. Autonomous System Link Advertisements The Link State Advertisement Header All link state advertisements begin with a common 20-byte header. This header contains enough information to uniquely identify the advertisements (Link State Type, Link State ID, and Advertising Router). Multiple instances of the link state advertisement may exist in the routing domain at the same time. It is then necessary to determine which instance is more recent. This is accomplished by examining the link state age, link state sequence number and link state checksum fields that are also contained in the link state advertisement header. The format of the Link State Advertisement Header is shown below: 102 D-Link DES-6500 Layer 3 Gigabit Ethernet Switch Link-State Advertisement Header Link-State Age Link-State ID Options Link-State Type Advertising Router Link-State Sequence Number Link-State Checksum Length Field Link State Age Options Description The time is seconds since the link state advertisement was originated. The optional capabilities supported by the described portion of the routing domain. The type of the link state advertisement. Each link state type has a separate advertisement format. The link state type are as follows: Type Description Router Links 1 Link State Type Network Links Summary Link (IP Network) Summary Link (ASBR) AS External Link Link State ID This field identifies the portion of the internet environment that is being described by the advertisement. The contents of this field depend on the advertisement's Link State Type. The Router ID of the router that originated the Link State Advertisement. For example, in network links advertisements this field is set to the Router ID of the network's Designated Router. Detects old or duplicate link state advertisements. Successive instances of a link state advertisement are given successive Link State Sequence numbers. The Fletcher checksum of the complete contents of the link state advertisement, including the link state advertisement header by excepting the Link State Age field. The length in bytes of the link state advertisement. This includes the 20-byte link state advertisement header. Link-State Advertisement Header Advertising Router Link State Sequence Number Link State Checksum Length 103 D-Link DES-6500 Layer 3 Gigabit Ethernet Switch Router Links Advertisements Router links advertisements are type 1 link state advertisements. Each router in an area originates a routers links advertisement. [. . . ] Israel TEL: +972-9-9715700 FAX: +972-9-9715601 URL: www. dlink. co. il LatinAmerica Isidora Goyeechea 2934 of 702, Las Condes Santiago ­ Chile S. A. TEL: 56-2-232-3185 FAX: 56-2-232-0923 URL: www. dlink. cl Brasil Av das Nacoes Unidas, 11857 - 14 - andar - cj 141/142 Brooklin Novo Sao Paulo - SP - Brazil CEP 04578-000 TEL: +55 11 55039320 FAX: +55 11 55039322 URL: www. dlinkbrasil. com. br South Africa Einstein Park II Block B 102-106 Witch-Hazel Avenue Highveld Technopark Centurion Gauteng Republic of South Africa TEL: 27-12-665-2165 FAX: 27-12-665-2186 URL: www. . d-link. co. za Russia Grafsky per. , 14, floor 6 Moscow 129626 Russia TEL: 7-095-744-0099 FAX: 7-095-744-0099 #350 URL: www. dlink. ru China No. 202, C1 Building, Huitong Office Park, No. 71, Jianguo Road, Chaoyang District, Beijing, 100025, China. TEL +86-10-58635800 FAX: +86-10-58635799 URL: www. dlink. com. cn Taiwan 2F, No. Hsin-Tien, Taipei Taiwan TEL: 886-2-2910-2626 FAX: 886-2-2910-1515 URL: www. dlinktw. com. tw Headquarters 2F, No. [. . . ]