Cisco UBR924 - uBR 924 Router Instrukcja Użytkownika Pobierz pdf (Strona 2)

The information presented in this document was created from devices in a specific lab environment. All of the

devices used in this document started with a cleared (default) configuration. If you are working in a live

network, ensure that you understand the potential impact of any command before using it.

Background Theory

Tunneling provides a way to encapsulate packets of a foreign protocol inside a transport protocol. Tunneling

is implemented as a virtual interface to provide a simple interface for configuration. The tunnel interface is not

tied to specific passenger or transport protocols, however, it is an architecture that is designed to provide the

services necessary to implement any standard point−to−point encapsulation scheme. Tunnels are

point−to−point links, and you must configure a separate tunnel for each link.

GRE creates a virtual point−to−point link to Cisco routers at remote points over an IP internetwork. By

connecting multiprotocol subnetworks in a single−protocol backbone environment, IP tunneling using GRE

allows network expansion across a single−protocol backbone environment. A Cable Modem Termination

System (CMTS) is any Data−over−Cable Service Interface Specifications (DOCSIS)−compliant headend

cable router, such as the Cisco uBR7246, uBR7223, or uBR7246VXR.

Configure

In this section, you are presented with the information to configure the features described in this document.

Network Diagram

This document uses the network setup shown in the diagram below.

This setup creates a tunnel between the two cable modems uBR924−ddd5 and uBR924−b5db. The example

below uses two uBR924s and a uBR7246VXR. For this set up, the names of the cable modems are

ubr924−ddd5 and ubr924−b5db, and they use Cisco IOS version 12.1(5)T4. The tunnel interfaces are

dynamically created in global configuration mode by issuing the command interface tunnel 0.

Note: The uBR900 cable modems do not have to be connected to the same uBR7200 CMTS or the same

service provider's network as long as there is IP connectivity between the two cable modems.

Configurations

This document uses the configurations shown below.

Note: Bold text refers to GRE related commands. Comments are in blue and refer to the line above.

ubr924−ddd5

1 2 3 4 5 6 7 ... 14 15

Brak uwag

Cisco UBR924 - uBR 924 Router Instrukcja Użytkownika Strona 2