D-Link xStack DGS-3120 Series Reference Guide

xStack® DGS-3120 Series Layer 3 Managed Gigabit Ethernet Switch Web UI Reference Guide
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Version No.
Packet Length
Router ID
Area ID
Authentication Type
Authentication
Authentication
Checksum
Link-State Update Packet
4
Number of Advertisements
Link-State Advertisements ...
Figure 5-35 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 link-state advertisement headers.
The format of the Link-State Acknowledgment packet is shown below:

D-Link xStack DGS-3120 Series Specifications

General

MAC Address Table	16K entries
Ports	10/100/1000BASE-T ports
VLANs	4094
Jumbo Frame	Up to 9KB
Power Supply	Internal power supply (depending on model)
Power over Ethernet (PoE)	No
Layer 3 Features	RIP
Quality of Service (QoS)	8 queues per port, DiffServ
Security Features	ACLs
Management	Web-based, CLI, SNMP
Operating Temperature	0°C to 40°C
Storage Temperature	-40°C to 70°C
SFP Ports	Combo 10/100/1000BASE-T/SFP ports and/or dedicated SFP/SFP+ ports (depending on model)