ADTRAN ATLAS 550 Bedienungsanleitung PDF herunterladen (Seite 115)

61200305L1-1 ATLAS 550 User Manual 9-1

Chapter 9

Router

OVERVIEW

The ATLAS 550 router provides remote connectivity of LANs within an

ATLAS 550—from LAN-to-WAN connection or from WAN-to-WAN

connection.

Internet Protocol (IP) routing is performed at layer 3 of the Open System In-

terconnection (OSI) model. (See Appendix B, OSI Model and Frame Relay

TechnologyOverview,for adiscussionof theOSI model.) Therouting process

determines the optimal path for data packets to travel and then moves the

data packets along that path. Routers exchange information about paths or

routes that reach additional LAN segments. This exchange of routing infor-

mation allows a router to build a detailed knowledge of the network topol-

ogy. Criteria for selecting the best path can include such items as distance,

number of hops (servers or routers), and cost of the transportation media.

The ATLAS 550 supports Routing Information Protocol (RIP), a protocol

based on hops. Each route has aset number of hops (routers or servers) that

it must travel through to reach a final destination. If a new route to a host

addressthathasafewernumberofhopsis learned,itbecomesthepreferred

route. When a new route is learned, the router incrementsthe hop count by

one and immediately broadcasts the new route overthe other interfaces. To

prevent routing loops, RIP defines a hop count of 16 as an infinite or un-

reachable route.

TheR

OUTER

ENU

defines,configures, andmonitorsall ATLAS550R

OUTER

options. Figure 9-1 on page 9-2 displays the IP Router menu tree.

1 2 ... 110 111 112 113 114 115 116 117 118 119 120 ... 261 262

Keine Kommentare

ADTRAN ATLAS 550 Bedienungsanleitung Seite 115