Cisco BPX 8650, Installation And Configuration Manual

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18-3
Cisco BPX 8600 Series Installation and Configuration
Release 9.3.30, Part Number 78-12907-01 Rev. E0, May 2005
Chapter 18 Configuring Trunks and Adding Interface Shelves
Configuring Trunks
The interface types that are supported on the same card are listed in Table 18-2.
To set up a trunk, use the following procedure.
Step 1
Use the uptrk command to activate the trunk.
Use the uptrk command to activate the trunk 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. For details on virtual trunking,
see Chapter 24, “Configuring BXM Virtual Trunks.”
Use the uptrk command 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. For more information, refer to the dsptrks command of the
Cisco WAN Switching Command Reference, Reference 9.3.30 . If you up the trunk at both ends, the alarm
is cleared.
Step 2
Use the cnftrk command to override the trunk default values. You must use the cnftrk command for
virtual trunks, but it is an optional command for physical trunks. For virtual trunks, you must change the
VPI to a nonzero value before executing the addtrk command.
If you use the cnftrk command, 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 18-1. (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.
After you configure the trunk and add the trunk ( addtrk ), you can specify certain parameters again. For
example, a period of trunk use can give you enough information to indicate that you should change
parameters to optimize how the trunk is used.
Step 3
Use the addtrk command 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.
Reconfiguring a Trunk
This section describes how to change trunk parameters after you have added the trunk.
After you have added a trunk, you can reconfigure some parameters without first deleting the trunk by
using the
deltrk command. This means that you can reconfigure the following list of trunk parameters
when the trunk is in use. The
cnftrk
display highlights all configurable parameters, and dims parameters
that are not configurable.
Table 18-2 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/NNI) supported supported