Cisco BPX 8650, Installation And Configuration Manual

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18-5
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
•
Frame Scrambling
• Recv Impedance
To display the current trunk parameters, use the dsptrkcnf command. If you can make all the needed
parameter changes without deleting the trunk, execute the cnftrk command. Use the cnftrk command
at both ends of the trunk.
To change the applicable parameters that cannot be modified after adding a trunk, use the following
procedure.
Step 1
Delete the trunk by executing the deltrk command at one end of the trunk.
Step 2
Execute the cnftrk command at both ends of the trunk to reconfigure parameters.
Step 3 Execute the addtrk command at only one end of the trunk to add the trunk.
Switch software triggers a reroute of connections only if a change to a parameter results in too few
resources to support the current load of connections.
If you attempt to change one of the trunk parameters, the other endpoint is updated by switch software.
It is not necessary to change both endpoints’ parameters.
Note
MPLS partitions are not affected by trunk and line reconfiguration, because label switching partitions
cannot be increased beyond the available number of resources.
For a trunk between a node running the current release and a node running an earlier release (such as 9.2
or 8.5), you are prompted that you can change a parameter only if both ends allow such a change.
Removing a Trunk
To remove a trunk, use the following procedure.
Step 1 Use the deltrk command to delete the trunk. If both nodes are reachable, perform this command at one
end of the trunk only. Otherwise, you must perform this command at both ends. If the deltrk command
results in splitting up the network, connections whose endpoints are no longer in the same network are
automatically deleted.
Step 2
Use the dntrk command to down the trunk. Execute the dntrk command at both ends of the trunk.