Beta Draft Confidential
7-21/19/05 ATM Services Configuration Guide for CBX 3500, CBX 500, GX 550, and B-STDX 9000
Configuring Trunks
About Administrative Cost
About Administrative Cost
You can manage trunk traffic by defining the trunk’s administrative cost. Circuits that
route data based on administrative cost are created on the path with the lowest
administrative cost. You can assign an administrative cost value from 1-65534. The
lower the administrative cost of the path, the more likely the path will be chosen when
a PVC or SVC routed on administrative cost needs to be created.
The switch manages circuits as follows:
• When you first define a circuit, the circuit looks for a path that has enough
available virtual bandwidth to handle the circuit’s effective bandwidth.
• If the circuit finds more than one path with enough available virtual bandwidth,
the circuit chooses the path with the lowest administrative cost. This assumes that
administrative cost is the designated routing metric. For the UNI or NNI logical
port endpoint, if you designate CDV or end-to-end delay as the routing metric, the
circuit chooses the trunk(s) with the lowest CDV or end-to-end delay.
The switch automatically reroutes circuits around a failed trunk or switch. If a circuit
cannot find a path with sufficient bandwidth, the circuit remains in an inactive state
until the bandwidth becomes available.
For more information on the rules used by the switch to establish PVC endpoints, see
“PVC Endpoint Rules” on page 10-4.
Note – The CBX 500 and GX 550 switches route circuits based on the routing metric
you select for the ATM UNI or NNI logical port endpoint: Admin Cost, cell delay
variation (CDV), or end-to-end delay. See “ATM Direct Trunk” on page 2-10 for more
information.
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