Example Networks - HP ProCurve 7000dl Series Basic Management And Configuration Manual

Configuring the Data Link Layer Protocol for E1, T1, and Serial Interfaces

Example Networks

London
E1 with
Seething Lane
PPP
Office
192.168.1.1
Router A
6-48
Example Networks
This section outlines examples of E1- and T1-carrier lines that use PPP, Frame
Relay, and HDLC as the Data Link Layer protocol. It also provides examples
of WANs that are using PPP authentication.
Example 1. Figure 6-9 shows a company's WAN that includes a connection
between two offices in London. Because this company needed a constant,
reliable connection between these two offices, they leased an E1-carrier line
for both the Seething Lane and Chelsea Harbor offices. The Data Link Layer
protocol is PPP.
The company also required a connection to its Paris office. For this connec-
tion, the company negotiated an SLA with a Frame Relay service provider.
Finally, the company set up an Asymmetric Digital Subscriber (ADSL) line to
a local Internet Service Provider (ISP). Through this connection, the com-
pany's employees can access the Internet. (For information about ADSL, see
Chapter 7: ADSL WAN Connections.)
E1 with
Frame Relay
10.1.1.1 /30
London
Chelsea Harbor
Router B
Figure 6-9. Example WAN Using E1-Carrier Lines with PPP and Frame Relay
Figure 6-10 shows the configuration for the E1, PPP, and Frame Relay inter-
faces, as they appear in the running-config for Router B, the router for the
London Chelsea Harbor office.
Frame Relay
Network
Router
ADSL2+ Annex B
with PPPoE
Paris
E1 with
Frame Relay
Router C
ISP
Internet