Beta Draft Confidential
Configuring ATM Over MPLS Trunks
Configuring Feeder Logical Ports
ATM Services Configuration Guide for CBX 3500, CBX 500, GX 550, and B-STDX 9000 1/19/058-29
Bandwidth Allocation For each service class type, the Bandwidth Allocation column
displays one of the following:
• Dynamic – Enables the bandwidth allocation to change
dynamically according to bandwidth demands. Dynamic
bandwidth allocation pools the remaining bandwidth for
this logical port. This includes bandwidth that has not
already been allocated to a specific queue or assigned to a
connection.
• Fixed – Specifies that a percentage of bandwidth be
reserved for the service class. If the network requests a
circuit that exceeds the fixed value, the circuit cannot be
created. If all four service classes are set to Fixed, all four
values should equal 100% bandwidth.
Fixed At % If you selected Fixed in the Bandwidth Allocation column, then
for each class enter the percentage of bandwidth you want to
reserve for that class.
If all four service classes are set to Fixed, ensure that all four
values add up to 100% so that you do not waste bandwidth.
Routing Metric The routing metric configured for the logical port. Routing
metrics allow the switch to select less congested paths and
avoid congested paths when transferring data.
Routing metric options are:
• Cell/Frame Delay Variation – Measures the average
variation in delay between one cell/frame and the next,
measured in fractions of a second. When emulating a
circuit, cell/frame delay variation measurements allow the
network to determine if cells are arriving too fast or too
slow.
• End-to-End Delay – Measures the time (propagation and
transmission delay) it takes a cell/frame to get from one end
of a connection to the other. It is measured when the port
initially comes up; it does not include queueing delays, so it
does not affect port congestion.
• Admin Cost – Measures the administrative cost associated
with the logical port. The administrative cost is specified by
the administrator, enabling you to adjust path selection
manually.
Note: For Frame Relay, routing metrics apply only if the port is
configured as a UNI DCE or UNI DTE logical port.
Table 8-7. Add Logical Port: QoS Tab Fields (Continued)
Column Action/Description
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