Cisco BPX 8600 Series, Руководство по установке и настройке

Страница: 441 / 630

25-13
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
General Procedure to Set Up a Trunk
You cannot use a virtual trunk as an interface shelf (feeder) trunk; similarly, you cannot configure an
interface shelf trunk to act as a virtual trunk. Similarly, you cannot terminate interface shelf (feeder)
connections on a virtual trunk.
To setup a trunk:
Step 1 Use the uptrk command to activate the trunk.
Use the uptrk command to activate the port so that it can start to generate framing. It also determines
whether the trunk is a physical-only trunk or a virtual trunk. The third digit you specify in the
uptrk
command (represented by
slot.port.vtrk
) indicates that the trunk is virtual.
Use uptrk at each end of the trunk. When the trunk is upped at only one end, the node detects the trunk
as being in an alarm state (see dsptrks). Upping the trunk at both ends clears the alarm.
Step 2
Use the cnftrk command to override the trunk’s default values. You must use cnftrk for virtual trunks,
but it is an optional command for physical trunks. For virtual trunks, you must change the VPI to a
non-0 value before executing addtrk.
If you use cnftrk, you must make the same changes at both ends of the trunk. To display existing trunk
parameters, use the dsptrkcnf command. The configurable parameters are listed for each card type in
Table 25-3. (The possible parameters are PKT for FastPackets, ATM cells, BNI if the trunk is a BNI
card, or All.) Not all of these parameters apply to the BPX node.
Step 3
Use addtrk to add the trunk. Adding the trunk makes the trunk a usable resource, so you can add
connections (addcon) to carry traffic. You need to add only one end of the trunk.
After you configure the trunk, and add the trunk (addtrk), you can re-specify certain parameters. For
example, a period of trunk use may give you enough information to indicate that you should change
parameters to optimize how the trunk is used.
Setting up a BNI Virtual Trunk through an ATM Cloud
The following example is a general procedure on how to set up a virtual trunk through an ATM cloud
using Cisco equipment (that is, a BPX or IGX cloud).
Step 1
Obtain a VPC from the ATM cloud provider.
Step 2 Set up cables by doing the following: in the cloud network, physically connect a BXM port to each BNI
port that is likely to carry virtual trunks.
Step 3
For each port connected to a BNI virtual trunk port, use the following configuration sequence:
upln slot.port
Table 25-4 Interface Types Supported on the Same Card
Interface Type BXM UXM
Physical trunks supported supported
Virtual trunk supported supported
Interface shelf (feeder) trunks supported not supported
Ports (UNI) supported supported