User manual D-LINK DGS-3627G

[. . . ] User Manual Product Model: Release 2 DGS-3600 Series Layer 3 Gigabit Ethernet Managed Switch ©Copyright 2007. All rights reserved. xStack DGS-3600 Series Layer 3 Gigabit Ethernet Managed 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 and the D-LINK logo are trademarks of D-Link Corporation; Microsoft and Windows are registered trademarks of Microsoft Corporation. [. . . ] A router that sends a Link-State Request packet has in mind the precise instance of the database pieces it is requesting, defined by LS sequence number, LS checksum, and LS age, although these fields are not specified in the Link-State Request packet itself. The format of the Link-State Request packet is shown below: Link-State Request Packet Version No. 3 Router ID Area ID Checksum Authentication Authentication Link-State Type Link-State ID Advertising Router Packet Length Authentication Type Figure 8- 28. Link-State Request Packet Each advertisement requested is specified by its Link-State Type, Link-State ID, and Advertising Router. Link-State Request packets are understood to be requests for the most recent instance. Link-State Update Packet Link-State Update packets are OSPF packet type 4. Each Link-State Update packet carries a collection of link-state advertisements one hop further from its origin. Link-State Update packets are multicast on those physical networks that support multicast/broadcast. In order to make the flooding procedure reliable, flooded advertisements are acknowledged in Link-State Acknowledgment packets. If retransmission of certain advertisements is necessary, the retransmitted advertisements are always carried by unicast Link-State Update packets. The format of the Link-State Update packet is shown below: 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 8- 29. Link-State Update Packet 161 xStack DGS-3600 Series Layer 3 Gigabit Ethernet Managed Switch 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 LinkState 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 link-state 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 8- 30. 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. Link-State Advertisement Formats There are five distinct types of link-state advertisements. Each link-state advertisement begins with a standard 20-byte link-state advertisement header. [. . . ] D-Link tilbyder gratis teknisk support til kunder i Danmark i hele produktets garantiperiode. Danske kunder kan kontakte D-Link's tekniske support via vores hjemmeside eller telefonisk. D-Link teknisk support over telefonen: Tlf. 08:00 ­ 20:00 D-Link teknisk support på Internettet: http://www. dlink. dk Teknistä tukea asiakkaille Suomessa: D-Link tarjoaa teknistä tukea asiakkailleen. 9 - 21 numerosta 0800-114 677 Internetin kautta Ajurit ja lisätietoja tuotteista. [. . . ]