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Configuring the Maximum Number of ATM1 VCs on a VP


For ATM1 interfaces, you must configure the maximum number of virtual circuits (VCs) allowed on a virtual path (VP) so that sufficient memory on the ATM1 PIC can be allocated for each VC.

To configure the highest-numbered VCs on a VP, include the maximum-vcs and vpi statements at the [edit interfaces interface-name atm-options] hierarchy level:

The VP identifier can be a value from 0 through 255. For most interfaces, you can define a maximum of 4090 VCs per interface, and some interfaces have higher limits. Promiscuous mode removes these limits. For more information, see Configuring ATM Cell-Relay Promiscuous Mode.

All VPIs that you configure in the atm-options statement are stored in a single table. If you modify the VPIs—for example, by editing them in configuration mode or by issuing a load override command—all VCs on the interface are closed and then reopened, resulting in a temporary loss of connectivity for all the VCs on the interface.

You can also include some of the statements in the sonet-options statement to set SONET/SDH parameters on ATM interfaces, as described in Configuring SONET/SDH Parameters on ATM Interfaces.