Cisco 827 - 827 Router - EN Manual de usuario descargar pdf (Pagina 19)

Network Scenarios Pagina 19 di 35

http://www.cisco.com/univercd/cc/td/doc/product/access/acs_fix/827/827swcfg/ntwkscen.htm 14/02/2001

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Concurrent Routing and Bridging

This network shows a remote user connecting to the Internet using concurrent routing and bridging

(CRB) to route voice traffic and bridge data traffic while keeping each of them separate. This scenario is

useful if you want to simplify your network setup for data transmission and then configure voice. The IP

address is configured to recognize the difference between data traffic and voice traffic (voice traffic is

configured with QoS parameters and virtual circuits). IRB can do routing and bridging on the same

interface; CRB does routing and bridging on separate interfaces.

Figure 2-6 shows a CRB Internet scenario with the voice traffic routed and the data traffic bridged.

Figure 2-6: CRB Internet Scenario

Concurrent routing and bridging is accomplished using different subinterfaces under the ATM interface.

Each ATM subinterface that is created is treated uniquely in the network.

Data traffic in this scenario is bridged across ATM subinterface2, using AAL5SNAP encapsulation. A

single PVC is created with a vpi/vci value of 8/35.

Voice traffic is routed across ATM0 subinterface 0.1. There is a single PVC created with a virtual path

identifier and virtual channel identifier (vpi/vci) value of 1/40 for voice. The voice subinterface is

configured with remote dial peers to determine where outgoing calls are sent and local dial peers to

determine what numbers each port should respond to. Each VoIP dial peer is configured for H.323

signaling.

The following configuration topics are covered in this section:

l Specifying CRB and Configuring the Ethernet Interface

l Configuring the ATM Interface and Subinterfaces

l Configuring Voice Ports

l Configuring the POTS Dial Peers

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Cisco 827 - 827 Router - EN Manual de usuario Pagina 19