ATM Services Configuration Guide for CBX 3500, CBX 500, GX 550, and B-STDX 9000 E-1
Beta Draft Confidential
E
Priority Routing
This appendix provides guidelines for using Priority routing, which enables you to
prioritize PVCs and SVCs in your network.
This appendix contains:
• “About Priority Routing” on page E-1
• “Routing Priority Rules” on page E-4
• “Priority Routing and Path Cost” on page E-6
About Priority Routing
When you use priority routing to prioritize virtual circuits (VCs), the circuits
configured with higher priorities attempt to select more optimal network paths during
initial circuit setup, load balance rerouting, and trunk-failure recovery.
Priority routing can provide the following advantages:
• Higher up time for high-priority circuits
• Optimal paths for high-priority circuits, which results in lower delay
• Higher capacity to burst past the guaranteed QoS rates for high-priority circuits
The switch treats priority routing, QoS class, and circuit priority as independent
elements. Priority routing rules are used for connection setup. QoS class is applied
after the connection is set up. Circuit priority rules are applied once QoS class is
established. Keep in mind that you must assign a higher priority to real time QoS
classes.
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