LevelOne GSW-2600TXM Manual do Utilizador descarregar pdf (Página 168)

168

State The communication state for two adjacent routers:

Down: This is the initial state of a neighbor conversation. It

indicates that there has been no recent information

received from the neighbor.

Attempt: This state is only valid for neighbors attached to

non-broadcast networks. It indicates that no recent

information has been received from the neighbor, but that

the router is attempting to contact the neighbor by sending

Hello packets.

Init: A Hello packet has recently been seen from the neighbor.

However, bidirectional communication has not yet been

established with the neighbor.

2-Way: Communication between the two routers has been

established. This is the most advanced state short of

beginning adjacency establishment. Note that both the

Designated Router and Backup Designated Router are

selected from the set of neighbors in state 2-Way or

greater.

ExStart: This is the first step in creating an adjacency between the

two neighboring routers. The goal of this step is to decide

which router is the master, and to decide upon the initial

sequence number. Neighbor conversations in this state or

greater are called adjacencies.

Exchange: The router is describing its entire link state database by

sending database description packets to the neighbor.

(Each database description packet has a sequence

number, and is explicitly acknowledged.) All adjacencies in

Exchange state or greater are used by the flooding

procedure. In fact, these adjacencies are fully capable of

transmitting and receiving all types of OSPF routing

protocol packets.

Loading: Link State Request packets are sent to the neighbor

asking for more recent advertisements that have been

discovered (but not yet received) in the Exchange state.

Full: The neighboring routers are fully adjacent. These

adjacencies will now appear in router links and network

links advertisements.

Events The number of events encountered that cause a neighbor state

change since boot up.

Displaying the Virtual Neighbor Table

Virtual links can be used to link an area isolated from the backbone, to create a

redundant link between any area and the backbone to help prevent partitioning, or to

connect two existing backbone areas into a common backbone. Note that the processes

of establishing a active link between virtual neighbors is similar to that used for

physically adjacent neighbors.

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