D-Link DES-3326S manual 139

DES-3326S Layer 3 Fast Ethernet Switch User’s Guide

•Down − No information has been received from any router on the segment.

•Attempt − On non-broadcast multi-access networks (such as Frame Relay or X.25), this state indicates that no recent information has been received from the neighbor. An effort should be made to contact the neighbor by sending Hello packets at the reduced rate set by the Poll Interval.

•Init − The interface has detected a Hello packet coming from a neighbor but bi-directional communication has not yet been established.

•Two-way− Bi-directional communication with a neighbor has been established. The router has seen its address in the Hello packets coming from a neighbor. At the end of this stage the DR and BDR election would have been done. At the end of the Two-way stage, routers will decide whether to proceed in building an adjacency or not. The decision is based on whether one of the routers is a DR or a BDR or the link is a point- to-point or virtual link.

•Exstart − (Exchange Start) Routers establish the initial sequence number that is going to be used in the information exchange packets. The sequence number insures that routers always get the most recent information. One router will become the primary and the other will become secondary. The primary router will poll the secondary for information.

•Exchange − Routers will describe their entire link-state database by sending database description packets.

Switch Management and Operating Concepts 139