ADTRAN Express 6120 Bedienerhandbuch PDF herunterladen (Seite 27)

Chapter 1. Understanding IDSL and the Express 6100/6120

61200176L1-1 Express 6100/6120 User Manual 1-5

5. PPP or Frame Relay: The layer two protocol used to transfer

packets can be PPP or Frame Relay (RFC 1490). PPP allows a

point-to-point connection, whereas Frame Relay can provide up

to ten permanent virtual circuits.

Routing and Bridging with the Express 6100/

6120

The Express 6100/6120 is a Router and Transparent Learning Bridge.

Its features can be easily configured and used once several basic con-

cepts are understood.

Factory Default

The Express 6100/6120 comes from the factory configured for MAC

Bridging with no filters or connection information defined. An IP ad-

dress of 10.0.0.1 with a network mask of 255.255.255.0 is preloaded.

The factory default layer two configuration is Auto Detect, which au-

tomatically detects PPP or Frame Relay.

Bridging

In Bridge Mode, the Express 6100/6120 can be used to connect two

LANsegments.Inthismode,allprotocolsaresupportedbecausethey

are transported across the IDSL link at the MAC layer. The Spanning

Tree Algorithm can be used to guarantee a loop-free topology. MAC

addresses are “learned” by each Express 6100/6120 to prevent non-

WAN packets from being bridged.

IP Routing

The Express 6100/6120 operates as an IP router when the Configura-

tion/IP/IP Router/Mode optionisconfiguredtoOn.InPPPmode,the

Express 6100/6120 uses an IP unnumberedWAN interface; theIP ad-

dress and mask assigned to the unit’s LAN interface apply to all rout-

ing and IP operations for the unit. In Frame Relay mode, each PVC

can be specified as numbered or unnumbered links. If a default gate-

way is specified on the network of the Ethernet interface, the unit at-

tempts to reach the gateway through that interface. If no default

gateway is specified (i.e., 0.0.0.0) the WAN interface becomes the de-

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ADTRAN Express 6120 Bedienerhandbuch Seite 27