Cisco bpx-8620 ユーザーガイド

25-18

Cisco BPX 8600 Series Installation and Configuration

Release 9.3.0, Part Number 78-10674-01 Rev. D0, July 2001

Chapter 25 Configuring BXM Virtual Trunks

Example: Virtual Trunk Across an ATM Network

•

traffic classes supported

•

the number of connection channels supported

Use the addtrk command to check for matching values before allowing the trunk to be added to the
network topology.

The network topology as seen from a dsptrks command at BPX_A would be:

BPX_A 4.3.1-10.2.1/IGX_A

BPX_A 4.3.2-5.1.1/BPX_B

Figure 25-6 Addition of Virtual Trunks Across a Public ATM Network

Adding Virtual Trunks Using BNI Cards

This section is a general procedure for setting up a virtual trunk.

Virtual trunking is an optional feature that must be enabled by Cisco prior to adding virtual trunks. Also,
revision levels of BNI firmware must be current.

This procedure assumes that Cisco equipment is used in the ATM Cloud as well as in the Cisco WAN
Switching subnetworks. In this case, a BNI output from the subnetwork is connected to a UNI input at
the ATM Cloud (see Figure 25-7).

Step 1

In the ATM cloud network, physically connect a port at the cloud edge to each BNI port in the Cisco
WAN Switching Network that is intended to have virtual trunks.

Public ATM network

ATM-UNI

17712

BXM 4

IGX 10

4.3.1

10.2.1

4.3

10.2

VPCs within the cloud,

one for each virtual trunk

(Virtual trunks can be

type CBR, VBR, or ABR)

BPX_A

IGX_A

BXM 5

BPX_B

4.3.2

10.2.3

5.1.1

5.1.2

5.1