User manual D-LINK DXS-3350SR

[. . . ] xStack Stackable Gigabit Layer 3 Switch Manual D-Link TM xStack Release IV High Density Layer 3 Stackable Gigabit Switch Manual xStack Stackable Gigabit Layer 3 Switch Manual _________________________________________________________________________________ Information in this document is subject to change wi thout notice. © 2004 D-Link Computer Corporation. Reproduction in any manner whatsoever without the written permission of D-Link Computer Corporation is strictly forbidden. Trademarks used in this text: D-Link and the D-LINK logo are trademarks of D-Link Computer Corporation; Microsoft and Windows are registered trademarks of Microsoft Corporation. [. . . ] If retransmission of certain advertisements is necessary, the retransmitted advertisements are always carried by unicast LinkState Update packets. The format of the Link-State Update packet is shown below: 176 xStack Stackable Gigabit Layer 3 Switch Manual Link-State Update Packet Version No. 4 Router ID Area ID Checksum Authentication Authentication Packet Length Authentication Type Number of Advertisements Link-State Advertisements . . . Figure 6- 114. Link-State Update Packet The body of the Link-State Update packet consists of a list of link-state advertisements. Each advertisement begins with a common 20-byte header, the link-state advertisement header. Otherwise, the format of each of the five types of link-state advertisements is different. Link-State Acknowledgment Packet Link-State Acknowledgment packets are OSPF packet type 5. To make the folding of link-state advertisements reliable, flooded advertisements are explicitly acknowledged. This acknowledgment is accomplished through the sending and receiving of Link-State Acknowledgment packets. Multiple link-state advertisements can be acknowledged in a single Link-State Acknowledgment packet. Depending on the state of the sending interface and the source of the advertisements being acknowledged, a Link-State Acknowledgment packet is sent either to the multicast address AllSPFRouters, to the multicast address AllDRouters, or as a unicast packet. The format of this packet is similar to that of the Data Description packet. The body of both packets is simply a list of linkstate advertisement headers. The format of the Link-State Acknowledgment packet is shown below: Link-State Acknowledgment Packet Version No. 5 Router ID Area ID Checksum Authentication Authentication Packet Length Authentication Type Link-State Advertisement Header . . . Figure 6- 115. Link State Acknowledge Packet Each acknowledged link-state advertisement is described by its link-state advertisement header. It contains all the information required to uniquely identify both the advertisement and the advertisement's current instance. 177 xStack Stackable Gigabit Layer 3 Switch Manual Link-State Advertisement Formats There are five distinct types of link-state advertisements. Each link-state advertisement begins with a standard 20-byte linkstate advertisement header. Succeeding sections then diagram the separate link-state advertisement types. Each link-state advertisement describes a piece of the OSPF routing domain. Every router originates a router links advertisement. In addition, whenever the router is elected as the Designated Router, it originates a network links advertisement. Other types of link-state advertisements may also be originated. The flooding algorithm is reliable, ensuring that all routers have the same collection of link-state advertisements. The collection of advertisements is called the linkstate (or topological) database. [. . . ] 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. [. . . ]