Congestion on Software Interfaces

This topic describes how congestion occurs on software interfaces.

This topic describes how congestion occurs on software interfaces.

Subinterfaces and software interfaces do not have their own separate transmit (Tx) ring; therefore, no congestion can occur. These interface types include dialers, tunnels, and Frame Relay subinterfaces, and will only congest when their main hardware interface Tx ring congests. The Tx ring state is an indication of congestion for software interfaces.

Software interfaces can implement a software shaping queue when traffic shaping is configured on the Frame Relay subinterface, and, in this case, the main interface software queue will be a FIFO queue.

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