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PA-POS-1OC3 Single-Port Port Adapter Installation and Configuration Guide
OL-6514-04
Chapter 4 Configuring the PA-POS-1OC3
Push Mode Description
Step 1 To configure an interface for line loopback, enter the loop line command:
Router(config)# interface pos 3/0
Router(config-if)# loop line
Step 2 To disable line loopback, enter the no loop line command.
Router(config)# interface pos 3/0
Router(config-if)# no loop line
For more information about interface subcommands and the configuration options available for the
supported routers, refer to the publications listed in the “Related Documentation” section on page viii.
Push Mode Description
If you have not been advised by Cisco to use the information in this section, do not do so.
The PA-POS-1OC3 and PA-POS-2OC3 port adapters support a different algorithm (from that of most
port adapters) for handling data. On the transmit side, it can either pull packets from the CPU (Pull
mode) or push packets from the CPU to the port adapter (Push mode). The PA-POS-1OC3 and
PA-POS-2OC3 port adapters were developed with a software architecture that deviates from the design
of previously developed port adapters. A majority of the port adapters allow data to be pulled from the CPU
to their interfaces. Because a few corner-case conditions exist, you may require the ability to configure
the PA-POS-1OC3 and PA-POS-2OC3 port adapters to behave the same as the rest of the port adapter
product family. The new CLI described in this section allows the customer to change the PA-POS-1OC3
and PA-POS-2OC3 port adapters Push mode behavior to the standard Pull mode.
Caution Only customers who have been advised by Cisco to use this CLI should do so. If you have not been
advised by Cisco to use the dma model pull enable command, do not do so.
Note Changing from Push mode to Pull mode is applicable only on a Cisco 7200 VXR router with an NPE-G1
and PA-POS-1OC3 or PA-POS-2OC3 installed.
Note We recommend changing the mode during a standard maintenance window.
The Pull Mode is supported on Cisco IOS Release 12.4(15)T1.
To change the TX DMA mode from the default Push mode to Pull mode, follow these steps:
• Enter the dma model pull enable command to change the Push mode to Pull mode. When the dma
model pull enable command is executed, all the PA-POS-1OC3 and PA-POS-2OC3 port adapters
installed are soft OIRed to reinitialize them to Pull mode.
• To change the Pull mode to Push mode, enter the no dma model pull enable command. When the
no dma model pull enable command is executed, all the PA-POS port adapters are soft OIRed to
reinitialize them to Push mode.