Buffer management
Module
QoS provides a total of 4000 packet buffers in each line card. It supports per port buffer
limits in the ingress direction (ingress buffers) and per-port packet descriptor limits in the egress
direction (egress buffers) to avoid over-utilization of buffers by any specific port. Module QoS
also supports buffer limits at the queue level to allow fair sharing of buffers and packet
descriptors across the queues associated with a port.
Module QoS also supports flow control using 802.3x standards. Flow control prevents the
buffer allocation limits (receive buffer limit) from being reached.
The show qos module ethernet command shows the port level ingress and egress
buffers, port level xon and xoff limits and queue level buffer limits
Module QoS troubleshooting
Troubleshooting August 2013 273
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