From CCIE Study Wiki
Switched virtual circuits (SVCs) allow access through a Frame Relay network by setting up a path to the destination endpoints only when needed and tearing down the path when it is no longer needed.
Theory
The temporary nature of Switched virtual circuits (SVCs) are different from that of PVC's, which are always up and configured.
You can enable basic SVC support with a frame-relay svc command needed on the interface. Each interface that supports SVCs must also have a map-group associated with it.
A map-group has one or more map-lists associated with it. Each map-list statement will supply the specified map-group with a specific source and destination addresses for a SVC.
Map-lists can be further configured with QoS commands by defining QoS map classes for the various SVC destination addresses. Options such as CIR, MINCIR, and Queuing can all be specified.
Commands
- frame-relay svc (interface) - Enables SVC support on an interface
- map-group group-name (interface) - Applies the specified map-group to an interface
- map-list map-group-name source-addr {e164 | x121} source-address dest-addr {e164 | x121} destination-address (global) - Defines a SVC source/destination address that is associated with the named map-group
- ip ip-address class class-name [ietf] [broadcast [trigger]] (map-list) - Allows you to associate QoS settings with a class map under the specified map-list.
- map-class frame-relay map-class-name (global) - Creates a QoS map-class and enters into map-class configuration mode
- frame-relay cir in bps (map-class) - Sample QoS command in a map-class
Default Settings
Verification
- show frame-relay svc maplist - Displays all the SVCs under the specified map-list
Troubleshooting, Tips, and Tricks
Online Resources
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