System-defined queuing class maps are provided.
ou can use the following methods to proactively avoid traffic congestion on the device:
Apply WRED to TCP or non-TCP traffic.
Apply tail drop to TCP or non-TCP traffic.
For egress packets, you can choose one of the following congestion management methods:
Specify a bandwidth that allocates a minimum data rate to a queue.
Impose a minimum and maximum data rate on a class of traffic so that excess packets are retained in a queue to shape the output rate.
Allocate all data for a class of traffic to a priority queue. The device distributes the remaining bandwidth among the other queues.
For information about configuring congestion management, see the Configuring WRED on Egress Queues section.
You can configure WRED on egress queues to set minimum and maximum packet drop thresholds. The frequency of dropped packets increases as the queue size exceeds the minimum threshold. When the maximum threshold is exceeded, all packets for the queue are dropped.
SUMMARY STEPS
1. configure terminal
2. policy-map type queuing {[match-first] policy-map-name}
3. class type queuing class-name
4. random-detect [minimum-threshold min-threshold {packets | bytes | kbytes | mbytes} maximum-threshold max-threshold {packets | bytes | kbytes | mbytes} drop-probability value weight value] [threshold {burst-optimized | mesh-optimized}] [ecn | non-ecn]
5. (Optional) Repeat Steps 3 and 4 to configure WRED for other queuing classes.
6. (Optional) congestion-control random-detect forward-nonecn
